Clutch Sets

Standard Transmission & Gear, Inc.

The Standard You Demand

Let us help you fit your car.

We service everything we sell. Period.

Clutches, Clutch Kits, Flywheels, Clutch Hydraulic Master and Slave Cylinders

  • We sell genuine OEM replacement clutch components
  • All clutches are brand new – no worrying about rebuilt part failure
  • Our inventory is constantly restocked to assure you of complete availability
  • We provide technical help for service problems you may encounter
  • High performance clutches in stock
  • Flywheel resurfacing done on premises
  • Clutch master and slave cylinders are available for most popular applications
  • We sell flywheel shims to set your flywheel back to the original position

We offer quality clutch kits at very competitive pricing.

Pressure Plates

Pressure Plates

Clutch Discs

Clutch Disks

Truck Clutch

Car and Truck
High Performance

Also see: Flywheels  & Clutch Hydraulics pages.

Standard Duty Clutch Kit


AMS logo

Standard Transmission & Gear is a proud distributor of AMS Automotive’s transmission products.

Standard Duty Kits

As the premier independent supplier of manual transmission products to the automotive aftermarket, AMS Automotive continues to set the standard for product performance, reliability, and durability! What’s more, we offer nearly 100% coverage on all domestic and import applications for passenger cars and light or medium duty trucks. Rather than creating another “me too” line of new clutch kits, we set out to rethink and improve the way kits are developed, packaged, and sold.

SR Kits

Because some vehicles are used in situations where O.E. specs just don’t measure up, we’ve engineered heavy-duty and high-performance Series Upgrade (SR) New Clutch Kits that feature a unique combination of application-specific torque capacity, coefficient of friction, and clamp load characteristics. Each SR Upgrade relies on time-tested proven technology to provide longer life and optimum performance, while also taking into account the fact that each component must work in conjunction with other driveline components. It’s a delicate balancing act. If clamp load and torque capacity ratings are increased too much, component failure will likely occur in other areas such as mechanical or hydraulic linkage. If these ratings are increased too little, the components will simply fail when subjected to the added operating demands.

Heavy-Duty Upgrades

Heavy-duty SR Kits are engineered for activities such as towing, hauling, snow removal, commercial use, and off-road use. They feature beefier diaphragm or coil springs for increased clamping power, heavier gauge components, and alternative friction material compounds.

High-Performance Upgrades

High-performance SR Upgrades are engineered primarily for modified street use. They feature ductile iron castings along with performance grade components like chrome vanadium springs and heat treated pins, levers, yokes, and eyebolts. Spring pressure is also increased for added clamping power. The results are quick-clean engagement and longer life along with increased resistance to higher rpm’s and operating temperatures.

Heavy-duty and high-performance SR Kits are available in three levels or “series” called SR100, SR200, SR300.  Each series is engineered to meet distinctly different torque, horsepower, and usage requirements.

  • Series 100 SR100 Kits are designed for applications in which a mild improvement in clutch capacity is required. Organic friction material is utilized in order to provide drivability characteristics that are similar to the stock clutch. The organic material is usually bonded to a steel backing plate yielding higher burst strength capacity. SR100 Kits yield minimal mating surface wear and are therefore ideal for drivers with limited manual transmission experience.

  • Series 200 SR200 Kits are designed for applications in which a significant improvement in clutch capacity is required. Kevlar or High Density Aramid friction material is utilized in order to provide engagement characteristics that are similar to the stock clutch. Nevertheless, the coefficient of friction rating for Kevlar is 30% higher than O.E. organic friction material. Kevlar material offers less mating surface wear than sintered metallic material.

  • Series 300 Series 300 Kits are also designed for applications in which an extreme improvement in clutch capacity is required. Miba sintered metallic friction material is utilized in order to provide the highest coefficient of friction, although mating surface wear is increased and drivability is more abrupt. As a result, SR300 Kits are not recommended for drivers with limited manual transmission experience. Keep in mind that friction material is one of the primary factors in determining the longevity and drivability of any clutch system. Recommendations for friction material choice are largely determined by operating conditions and desired driving characteristics.

Quality, Coverage, Warranty, Packaging


In order to ensure optimum performance and lasting durability with every clutch installation, it’s important to use only quality clutch components that are engineered to function as a precision-matched system with other driveline components. That’s why, where applicable, every AMS clutch kit contains an all-new pressure plate assembly, disc assembly, release bearing, pilot bearing/bushing and alignment tool, designed for specific vehicle applications and driving styles.

Because few applications are identical in terms of driveline requirements, we don’t rely on low-grade substitutes in vehicles that demand the use of specific technological designs. Nor do we rely on low quality components produced in so-called “emerging markets”. These types of products simply can’t match our criterion of providing only those clutches which have been engineered and manufactured to the O.E. tolerance and performance specifications of major automobile manufacturers throughout the world. As a final measure of quality, each kit component must pass stringent performance assurance tests.


While some organizations may view parts proliferation as a threat, we look at it as an opportunity to set ourselves apart from the competition. Our extensive line of new clutch kits includes coverage on nearly 100% of all domestic and import applications for passenger cars and to light-medium duty trucks being driven in the U.S., Canada, and Latin America.

Shortly after nameplate introduction of a new vehicle, we utilize our product expertise to begin researching and testing components. When these efforts are combined with our strong O.E.M. relationships, we are almost always first to introduce kits for these late model applications to the aftermarket. In addition, we provide unsurpassed coverage on original style kits for older applications, while also including various pressure plate and disc assembly options for these same applications. When special upgrades are needed to resolve inherent problems in certain applications or driving styles, our offering of heavy-duty and high-performance Series Upgrade (SR) New Clutch Kits lead the industry. Available in multiple unique platforms, each SR Kit is engineered to meet distinctly different torque, horsepower, and usage requirements.

Finally, for the discerning import specialists that insist on nothing but the exact O.E.M./O.E.S. fit, form, and function, we offer a comprehensive lineup of Select Engineered (SE) Premium New Clutch Kits.


By design, clutches are meant to wear out, but they shouldn’t fail due to poor workmanship, engineering, or materials. The fact is that too many clutches do fail prematurely because there are well-disguised replacements that are built using inferior raw materials, unskilled labor, and third-world technology.

AMS clutch kits are different. We believe high quality has no substitute and we never take short cuts that might compromise our commitment to offering the highest quality products available. That’s why every AMS clutch kit is backed by the industry’s most extensive and reliable warranty against defects in workmanship and materials. All kits are warranted for a limited period of 12 months or 12,000 miles, whichever occurs first, except SR Upgrades, which are warranted for a limited period of 3-months or 3,000 miles. All warranty claims must be submitted and shipped to the distributor from which the product was purchased.


AMS clutch kit packaging has set a new standard in function and appearance. While other suppliers still insist on conventional packaging methods such as plastic “skin wrap” or cardboard inserts, AMS utilizes the latest available biostable foam technology. This advanced type packaging protects components against damage during shipping and handling, and also allows for inspection of the product, without destroying the basic protective function of the package. In addition, our unique SleevePac design uses a UV varnish coating that protects the package against dirt, resulting in increased shelf life.

Finally, the award-winning graphic designs used on our SleevePac show how proud we are to offer only the best of the best. Through the use of crisp product images and a listing of many of the O.E. products contained in AMS kits, our message of high quality is clearly spelled out in multiple languages.

Parts List :
This list is temporary and will be updated soon for ease of use.  Please call for your application.

  • 01-015 (10-1/2″ Jeep clutch kit 52671401)
  • 01-017 (10-1/2″ Jeep clutch kit 52641402)
  • 01-026A (10-1/2″ AMC, Jeep clutch kit 52641407)
  • 01-033 (91/8″ Jeep Clutch Kit)
  • 01-034 (10-1/2″ Jeep clutch kit 52641413)
  • 01-035 (Clutch Set) Jeep 87-89 10.375×1.125x10T
  • 01-036 Jeep Cherokee/Wrangler 1993 9.125×1.000x14T
  • 01-037 (10-1/2″ Jeep clutch kit 52641405)
  • 01-038 (10-1/2″ Jeep clutch kit 52641428)
  • 01-040 (9-1/8″ Jeep clutch kit 52301404)
  • 01-042 (9″ Jeep clutch kit 52281412)
  • 01-046 (Jeep Clutch Kit 52641428)
  • 04-002 (Clutch Set)GM 10.375x1x1.125x10T
  • 04-019 (10-1/2″ GM clutch kit 04-019)
  • 04-020 (Clutch Set) Chevrolet, GMC, Pontiac, 11.000×1.125x26T
  • 04-021 (10-1/2″ GM clutch kit 52642201)
  • 04-049 (Clutch Kit 52802202) Chevrolet, GMC, Pontiac 11.000×1.25x10T
  • 04-053 (9-1/8″ Chevrolet, Pontiac clutch kit 52332201)
  • 04-061 (8″ Chevrolet, Geo, Toyota clutch kit 52005202)
  • 04-062 (9 1/8″ GM Clutch Kit)
  • 04-064 (Clutch Set) Chevrolet, GMC, 12.000×1.25x10T
  • 04-065 (9-1/8″ Chevrolet, GMC clutch kit 52332203)
  • 04-072K (52802214) GM, 11.000×1.125x10T
  • 04-081 (11″ Chevrolet, GMC clutch kit 52802202)
  • 04-082 (Clutch Set) Chevrolet, Pontiac 9.688×1.125x26T
  • 04-090 (11″ Chevrolet, GMC clutch kit 52802213)
  • 04-104 (7-1/2″ Suzuki clutch kit 51905001)
  • 04-106 (Clutch Set)Chevrolet, GMC, 13.000×1.500x10T
  • 04-110 (8-7/8″ Chevrolet, Suzuki clutch kit 52252202)
  • 04-115 (8-1/2″ Saturn clutch kit 52152203)
  • 04-120 (12″ Chevrolet, GMC clutch kit 53022209)
  • 04-121 (11″ Chevrolet, GMC clutch kit 52802211)
  • 04-122 (Clutch kit)Chevrolet, GMC, 12.000×1.125x10T
  • 04-124 (Clutch kit) GEO, 6.750x.750x18T
  • 04-130 (Clutch Set) Chevrolet S-10,1985-1993 GMC, S15 1985-90,Sonoma,1991-1993, Isuzu Rodeo 1991-1992
  • 04-131 (Clutch Set)Chevrolet 1994-1995, GMC 1992-1995 12.000×1.125x10T
  • 04-133 (9-11/16″ Chevrolet, Pontiac clutch kit 52462201)
  • 04-137 (8-1/2″ Pontiac, Suzuki clutch kit 52152201)
  • 04-151 (11″ Chevrolet truck, GMC clutch kit 53022214)
  • 04-153 (Clutch Set)Chevrolet, GMC, 1996-2001 11×1.125x10T
  • 04-154 (Clutch Set)Chevrolet, GMC 1996-2002, 12.000×1.125x10T
  • 04-155 (9-1/4″ Chevrolet, GMC, Isuzu clutch kit 52332205)
  • 04-156 (Clutch Set)Chevrolet S10, GMC Sonoma, 2002-2003, 9.125×1.125x26T
  • 04-161 (8-1/2″ GM clutch kit 52152208)
  • 04-162 (9″ Chevrolet clutch kit 52252219)
  • 04-170 (53022205 97 & up Chevy 1/2 ton with 350 engine 12″ GM Clutch Kit)
  • 04-171 (11-1/2″ Chevrolet, GMC clutch kit 52982206)
  • 04-173 (11-3/4″ GM modular clutch kit 52972201)
  • 04-181 (Clutch Set)GMC, Chevrolet 1999-2001, 12.000×1.125x10T
  • 04-182 (Clutch Set)
  • 04-193 (8-1/2″ Saturn clutch kit 52162201)
  • 04-195 (9″ Saturn clutch kit 52282203)
  • 04-201 (Clutch Set)
  • 04-218 (9″ Chevrolet clutch kit 52252203)
  • 04-219 (9-1/4″ Chevrolet, GMC clutch kit 52332211)
  • 04-228 (Clutch Set)
  • 04-529 (13″ Chevrolet, GMC clutch kit 53306404)
  • 05-002 (9-1/8″ Chrysler, Dodge, Plymouth clutch kit – Special Order-Pop. Code 52…
  • 05-004 (Clutch Set)
  • 05-006 (52251406)
  • 05-026 (Clutch Set)
  • 05-029 (10-1/2″ Chrysler, Dodge, Plymouth clutch kit 52641403)
  • 05-041 (Clutch Set)
  • 05-048 (8-7/8″ Dodge, Eagle, Mitsubishi clutch kit 52251402)
  • 05-050 (9-7/16″ Dodge, Mitsubishi clutch kit 52401401)
  • 05-055 (8-7/8″ Hyundai clutch kit 52252603)
  • 05-058 (Clutch Set)
  • 05-063 (11″ Dodge clutch kit 52801406)
  • 05-065 (Clutch Set)
  • 05-068 (9-1/8″ Dodge clutch kit 52321402)
  • 05-070 (9-1/8″ Dodge clutch kit 52321401)
  • 05-072 (2007-2010 Hyundai Elantra 2.0L)
  • 05-073 (12-1/4″ Dodge clutch kit 53101402)
  • 05-074 (12″ Dodge clutch kit 53021401)
  • 05-085 (9-1/8″ Mitsubishi, Mopar modular clutch kit 52281403)
  • 05-086 (9-1/2″ Dodge modular clutch kit 52401404)
  • 05-087 (8-1/2″ Hyundai clutch kit 52152601)
  • 05-091 (7-7/8″ Hyundai clutch kit 52002601)
  • 05-101 (13″ Dodge clutch kit 53301402)
  • 05-102 (Clutch Set)
  • 05-104 (9-1/8″ Dodge clutch kit 52671404)
  • 05-109 (12″ Dodge clutch kit 53051401)
  • 05-114 (Clutch Set)
  • 05-116 (Clutch Set)
  • 05-119 (9-1/8″ Mopar modular clutch kit – Special Order-Pop. Code 52281410)
  • 05-122 (8-1/2″ Mitsubishi clutch kit 52151416)
  • 05-124 (05-11′ 5.9 Dodge 6.7- W/Mercedes G56 Trans)
  • 05-127 (8-1/2″ Kia clutch kit 52153201)
  • 05-224 (Clutch Set 63301405=05-224,167436,ps0523-2
  • 05-507 (8-7/8″ Hyundai, Kia modular kit with flywheel 52252607)
  • 05-508 (8-7/8″ Hyundai, Kia modular kit with flywheel 52252608)
  • 06-020 (7-7/8″ Nissan clutch kit 52004003)
  • 06-038 (9-1/2″ Nissan clutch kit 52404001)
  • 06-040 (7-1/2″ Nissan clutch kit 51904001)
  • 06-042 (9-7/8″ Nissan clutch kit 52504003)
  • 06-044 (9-1/2″ Nissan clutch kit 52404003)
  • 06-045 (9-1/2″ Nissan clutch kit 52404006)
  • 06-053 (8-7/8″ Nissan clutch kit 52244006)
  • 06-054 (8-7/8″ Nissan clutch kit 52254005)
  • 06-056 (8-7/8″ Nissan clutch kit 52254010)
  • 06-057 (Clutch Set)
  • 06-058 (9-7/8″ Nissan clutch kit 52504005)
  • 06-059 (9-1/2″ Nissan clutch kit 52404004)
  • 06-060 (8-7/8″ Nissan clutch kit 52254011)
  • 06-061 (9-1/2″ Nissan clutch kit 52404010)
  • 06-071 (9-1/2″ Nissan clutch kit 52414001)
  • 06-072 (Clutch Set)
  • 07-004 (CLUTCH SET)
  • 07-005 (10″ Ford, Mercury clutch kit 52542001)
  • 07-008 (CLUTCH KIT)
  • 07-011 (9-1/4″ Ford clutch kit 07-011)
  • 07-014 (10″ Ford/Mercury Clutch Kit 52542003)
  • 07-015 (11″ Ford clutch kit 52802010)
  • 07-016 (52542002)
  • 07-020 (8-1/2″ Ford, Mazda clutch kit 52152008)
  • 07-023 (Clutch Set)
  • 07-024 (11″ Ford clutch kit 52802017)
  • 07-026 (11″ Ford clutch kit 52802003)
  • 07-027 (Clutch Set)
  • 07-027A (Clutch Set)
  • 07-032 (Clutch Set)
  • 07-033 (11″ Ford clutch kit 52802009)
  • 07-035 (Clutch Set)
  • 07-042 (Clutch Set 52672002,52672001)
  • 07-050 (Clutch Set)
  • 07-054 (9″ Ford clutch kit 52252003)
  • 07-056 (10″ Ford clutch kit 52542004)
  • 07-057 (Clutch Set)
  • 07-065 (12″ Ford clutch kit 53022002)
  • 07-067 (9-7/16″ Ford, Mazda clutch kit 52503601)
  • 07-068 (7-1/8″ Ford clutch kit 51802001)
  • 07-069R (8-1/2″ Ford, Mercury clutch kit – Special Order-Pop. Code 52152004)
  • 07-075 (7-7/8″ Ford, Mercury clutch kit 52002002)
  • 07-076 (11″ Ford clutch kit 52802016)
  • 07-080 (13″ Ford clutch kit 53272001)
  • 07-092 (12-1/4″ Ford clutch kit 53112001)
  • 07-093 (9″ Ford, Mazda clutch kit 52252004)
  • 07-094 (8-7/8″ Ford, Mazda clutch kit 52252007)
  • 07-096 (10″ Ford, Mazda clutch kit 52502002)
  • 07-097 (Clutch Set)
  • 07-100 (11-7/8″ Ford clutch kit 53052005)
  • 07-113 (13″ Ford clutch kit 53302001)
  • 07-114 (Clutch Set)
  • 07-116 (9-1/4″ Ford, Mazda clutch kit 52252013/523222002)
  • 07-116NSA (9-1/4″ Ford, Mazda clutch kit 52322001)
  • 07-117 (Clutch Set)
  • 07-127 (12-1/4″ Ford clutch kit 53102002)
  • 07-130 (52902001 Clutch Kit)
  • 07-131 (53052005)
  • 07-136 (9-7/16″ Ford, Mercury clutch kit 52402001)
  • 07-138 (8-7/8″ Ford, Mercury clutch kit 52252009)
  • 07-141 (9-1/4″ Ford clutch kit 52283602)
  • 07-141NSA (Clutch Set)
  • 07-153 (Clutch Kit)
  • 07-154 (CLUTCH KIT)
  • 07-164 (9-7/16″ Ford clutch kit 52282001)
  • 07-166 (8-1/2″ Ford clutch kit 52202001)
  • 07-167 (52573601)
  • 07-179 (12″ Ford clutch kit 53032002)
  • 07-180 (13″ Ford clutch kit 53302008)
  • 07-187 (11″ Ford clutch kit 52802030)
  • 07-189 (Clutch Set)
  • 07-195 (Clutch Set)
  • 07-501 (9-1/4″ Ford clutch kit – Special Order-Pop. Code 07-501)
  • 07-906 (12-1/4″ Ford clutch kit 53102001)
  • 08-008 (8-3/8″ Honda clutch kit 52122401)
  • 08-009 (7-7/8″ Honda clutch kit 52002405)
  • 08-011 (7-7/8″ Honda clutch kit 52002402)
  • 08-012 (Clutch Set)
  • 08-014 (8-7/8″ Acura, Honda clutch kit 52252401)
  • 08-017 (8-3/4″ Acura clutch kit 52202403)
  • 08-022 (8-3/8″ Honda clutch kit 52122403)
  • 08-024 (8-7/8″ Honda clutch kit 52202401)
  • 08-026 (8-5/8″ Acura, Honda clutch kit 52202402)
  • 08-036 (Clutch Set)
  • 08-037 (8-1/2″ Acura clutch kit 52152401)
  • 09-015 (9-1/2″ Isuzu clutch kit 52402801)
  • 09-016 (9-1/4″ Isuzu clutch kit 52152807)
  • 09-018 (9-5/8″ Isuzu clutch kit 52462801)
  • 09-020 (9-1/2″ Honda, Isuzu clutch kit 52402401)
  • 10-015 (8-7/8″ Mazda clutch kit 52253601)
  • 10-018 (7-1/2″ Mazda clutch kit – Special Order-Pop. Code 51903601)
  • 10-036 (8″ Mazda clutch kit 52003603)
  • 10-040 (7-7/8″ Kia, Mazda, Mercury clutch kit 52002001)
  • 10-042 (Clutch Set)
  • 10-045 (9″ Mazda clutch kit 52253602)
  • 10-057 (9-1/2″ Mazda clutch kit 52413601)
  • 10-058 (8-7/8″ Mazda clutch kit – Special Order-Pop. Code 52153604)
  • 10-059 (8-7/8″ Mazda clutch kit 52253613)
  • 16-016 (Clutch Set)
  • 16-027 (8-7/8″ Toyota clutch kit – Special Order-Pop. Code 52255208)
  • 16-039 (7-3/4″ Toyota clutch kit 51905202)
  • 16-047 (9″ Toyota clutch kit 52245208)
  • 16-057 (8-7/8″ Toyota clutch kit 52245202)
  • 16-058 (8-7/8″ Toyota clutch kit 52245203)
  • 16-059 (9-3/8″ Toyota clutch kit 52365201)
  • 16-062 (9-3/8″ Toyota clutch kit – Special Order-Pop. Code 52365210)
  • 16-068 (9-3/8″ Lexus, Toyota clutch kit 52365205)
  • 16-069 (9-3/8″ Toyota clutch kit 52365203)
  • 16-070 (9-7/8″ Toyota clutch kit 52505201)
  • 16-073 (Clutch Set)
  • 16-076 (9-3/8″ Toyota clutch kit 52365204)
  • 16-077 (Clutch Set)
  • 16-080 (8-3/8″ Geo, Toyota clutch kit 52125203)
  • 167323 (7.3L solid retrofit for 167750 with bolts 167323)
  • 17-012 (8-1/4″ Volkswagen clutch kit 52105603)
  • 17-072 (9″ Audi, Volkswagen modular clutch kit with flywheel 52255602)
  • 24-004 (8-7/8″ Kia clutch kit 52253201)
  • 24-005 (7-7/8″ Kia clutch kit 52003201)
  • 24-006 (Clutch Set)
  • 24-008 (8-1/2″ Kia clutch kit 52153202)
  • 25-002 (8-1/2″ Chevrolet, Daewoo clutch kit – Special Order-Pop. Code 52152220)

Solid Flywheels

Solid Flywheels

Each new flywheel is engineered and manufactured to O.E.M. specifications, using premium grade iron, new ring gears, and new dowel pins. To reduce vibration and maximize performance, each unit is dynamically balanced, backed by our comprehensive warranty, and priced competitively.


Dual Mass Flywheels

Dual Mass Flywheels
A dual-mass flywheel (DMF) serves two functions. The primary function is to store energy from each piston’s firing pulse, and then send it to the crankshaft so that it continues smoothly rotating through the next piston stroke. The secondary function is to dampen damaging torsional spikes caused by engine vibration.


Click to go to our Flywheel & FW Conversion page.

Flywheels are bolted to the engine crankshaft and serve as the mounting-surface of the clutch assembly, while also acting as a heat sink to dissipate heat from the pressure plate and disc. During engagement, the disc is clamped between the pressure plate and flywheel, resulting in power transfer from the engine to the transmission. Contact between the flywheel and disc will naturally cause hot spots, grooves, thermal cracks and/or frequent concave warpage. Therefore, the flywheel should always be replaced or resurfaced during each clutch system replacement. Keep in mind, some flywheels are virtually impossible to resurface. Equipment plays an important role in the quality of the flywheel surface. AMS does not recommend the use of brake rotor lathes or small tool room lathes. Hot spots are significantly harder than the surrounding flywheel material. Brake rotor and small tool room lathes do not have the required cutting capacity to allow the cutting tool to remove hot spots in a uniform manner. Instead, a flywheel grinder or CNC lathe should be used.

No specific guidelines exist regarding the maximum amount of metal that can be removed from the friction surface. Removing too much metal may result in a no-release condition, because the mounted position of the flywheel and clutch assembly has been moved away from the release mechanism (AMS does NOT suggest the use of shims). An over-machined flywheel may also destroy the heat sink capacity and create a safety hazard. Conversely, if hot spots and wear flaws are not removed, and the flywheel is not returned to like-new flat condition, power transfer and component life will be minimized by chatter, slipping, and heat build-up. Further complicating matters, many flywheels utilize either a recess or step configuration, in which flywheel mounting-surface is higher or lower than the actual wear surface. It is imperative to maintain the proper step or recess dimension. Before grinding, the pressure plate mounting-surface should be measured relative to an unworn portion of the wear surface. While it may be difficult to find these specifications in O.E.M. manuals, the proper dimensions can be double-checked in any AMS catalog.

Clutch Hydraulics


Many late-model vehicles actuate the clutch system using a hydraulic clutch master cylinder and slave cylinder, rather than mechanical linkage. When the clutch pedal is depressed, the pushrod on the master cylinder displaces fluid from the cylinder, through a tube, to the slave cylinder. In most instances, the piston attached to the slave cylinder moves a release fork, attached to a release bearing, in order to disengage the clutch.

On other systems, the slave cylinder piston pushes forward against a release bearing to disengage the clutch. Hydraulic systems are designed to reduce pedal effort, and to simplify installation by more directly connecting the pedal to the clutch. They also eliminate the need for failure-prone items like return springs and cable mechanisms. Because hydraulic systems have built-in pedal travel already factored in, periodic adjustment is usually not required.

Problems generally arise when either the master cylinder or slave cylinder leaks hydraulic fluid, draws air, or fails to maintain adequate pressure required to disengage the clutch. If one of the components is damaged or leaks, it should be replaced before new clutch components are installed. On high mileage vehicles, it is also advisable to replace both components, even if only one of the components appears damaged. That’s because both components are designed with the same expected service life.

The AMS clutch hydraulics program provides industry-leading coverage on nearly 100% of all applications. Each sku is cataloged alongside the other components required for a complete clutch system replacement. Application specific tech bulletins and proper bleeding procedures are included with many sku’s. In addition, we use an “exact fit” approach, rather than relying on “will fit” aftermarket consolidations. This provides assurance of proper fit with the other components, and eliminates the need to search multiple catalogs for the necessary components.

Hydraulic Slave Cylinder

Clutch Slave Cylinders

The function of a slave cylinder is primarily controlled by the master cylinder. Slave cylinders are divided into two primary categories: Concentric slave cylinder (CSC) and external slave cylinder.

Concentric Slave Cylinder

The CSC is mounted inside the bell housing where the release bearing retainer is normally attached. This unique design offers the following benefits: Elimination of the clutch fork and related hardware, precise release bearing travel with better alignment geometry, and closer fit to the transmission which increases flexibility in passenger compartment design. A CSS uses a large coil spring to maintain constant contact between the bearing face and diaphragm spring fingers. Therefore, no “lost travel” is required between the release bearing and diaphragm spring before the clutch pressure plate begins to disengage.

Many newer style plastic body CSC designs include plastic shipping straps attached to the plastic bushing and to the body. These straps compress the overall length of the unit during installation, which means the pushrod does not need to be compressed in order to clear the release lever. If the hydraulic system has been properly bled, the straps will break when the first stroke of the clutch pedal moves the pushrod forward. Like other suppliers, AMS offers the CSC with the angular contact bearing already attached. However, AMS was the first supplier to offer popular CSC sku’s without the release bearing. Because the clutch kit contains the release bearing, this eliminates the duplicate cost of a release bearing when both the CSC and clutch kit are installed.

(No-bearing) Concentric Slave Cylinder

Since their introduction in light truck applications in the late 1980’s, clutch release systems containing a concentric slave cylinder (CSC) have become the hydraulic system of choice in domestic applications. Not only are they reliable and easy to troubleshoot, they also eliminate the need for other parts such as the release fork, quill, and pivot linkage. In many instances, the CSC is equipped with a replaceable angular contact release bearing. Because the thrust face surface of this bearing maintains constant contact with the pressure plate diaphragm spring, the bearing may fail before the remainder of the CSC. When installing a new clutch kit in a CSC equipped application, it’s important to always inspect the hydraulic system. If it is operating properly, simply replace the old release bearing with a new release bearing (contained in the clutch kit), along with the other components found in the kit. However, if the clutch will not release and/or the hydraulic system is leaking or will not bleed properly, a new CSC should be installed, along with a new master cylinder and clutch kit. In this instance, the technician is now forced to purchase two release bearings, one that’s contained in the kit and one that’s already attached to the new CSC.

In order to eliminate the duplicate cost of sourcing two release bearings, AMS offers the industry’s first and most comprehensive lineup of no-bearing (NB) options. Many of these NB options are among our most popular slave cylinders. What’s more, they offer a significant price reduction versus the same slave cylinder with a release bearing. Although the vehicle owner ultimately pays the price for unnecessary parts, many of the extra release bearings end up being returned to the jobber or WD. Because no paper trail exists for the sale of the extra bearing, the distributor may end up issuing an inflated credit for the bearing. All NB options are cataloged using the standard slave cylinder part number, followed by an NB suffix (i.e. S0710NB)

External Slave Cylinder

As the name implies, external slave cylinders are normally mounted on the outside of the transmission bell housing. They consist of few moving parts other than a piston, internal spring, and pushrod. A rubber boot is usually used to seal contaminants away from the moving parts. The release bearing used in this system always maintains preloaded contact with the diaphragm spring. The external end of the pushrod is normally tipped with plastic, mushroom-shaped, bushing that serves to reduce noise and eliminate surface wear on the clutch fork pushrod tip. The plastic bushing is also important because it helps determine the overall length of the rod. This exact length is very critical in the overall function of the hydraulic system.

Hydraulic Master Cylinder

Clutch Master Cylinders

The clutch master cylinder is directly connected to the clutch pedal and serves as the portion of the hydraulic system that generates hydraulic pressure. Master cylinders are divided into two primary categories based on the internal mechanism used to generate hydraulic pressure: seal over port systems and center-feed type systems.

Seal over port system

The seal over port system uses a push rod attached to the clutch pedal to produce piston movement in the master cylinder. When the piston moves, seals attached to the piston move forward. The primary seal passes over a small port in the wall of the cylinder, which allows fluid flow to and from the reservoir. Once the primary seal passes over the port, the fixed portion of fluid contained between the master and slave cylinder is moved toward the slave cylinder. This results in disengagement of the clutch. One variation of the seal over port is a plunger type master cylinder. Rather than using the attached seals that move with the pistons, the piston instead moves through the seals.

Center-feed type system

The center-feed type system uses small hooks attached to the nose of the piston. When the clutch pedal is not depressed, these hooks engage a flange on the valve stem. A circular rubber seal on the opposite end of the valve stem is held away from the master cylinder body. This allows fluid flow to and from the reservoir. When the clutch pedal is depressed, the hooks no longer hold the valve stem and it is pushed to the bottom of the master cylinder body. The reservoir is now separated from the fixed fluid, contained between the master and slave cylinder. As the clutch pedal is further depressed and the master cylinder piston moves even further, fluid is forced toward the slave cylinder, resulting in the disengagement of the clutch. Master cylinders are also subdivided into two additional categories: Integral reservoir systems and remote reservoir systems. The fluid reservoir of an integral reservoir system is part of the master cylinder body. The fluid reservoir of a remote reservoir system is attached to the master cylinder body via a rubber hose. The use of integral or remote reservoirs is dictated by the available room in the engine compartment. Both integral and remote reservoir types are used in seal over port and center feed type systems.

Hydraulics Pre-filled

Pre-Filled Hydraulic Systems

Late model hydraulic systems require a variety of complex bleed procedures. Obtaining this information is challenging, and properly bleeding these systems is even more difficult. The bleed procedure on a dry system can take up to an hour or more. To resolve these problems, AMS offers the industry’s first and most comprehensive lineup of pre-filled clutch hydraulics, available as a pre-filled system or a pre-filled master cylinder. Each system is pre-filled with hydraulic fluid and pre-bled, eliminating the need to perform this often-difficult task when the components are installed on the vehicle. When compared to the installation of dry components, shop time and the risk of warranty are substantially reduced.

Pre-Filled Systems

This system includes a master cylinder and slave cylinder, connected by the hydraulic line. No additional components are required, however, the pre-filled system may also include features such as a pulsation damper, heat shield, or neutral safety switch. These added components aren’t generally included with the individual master or slave cylinder. The design of these components makes conventional bleeding difficult and time consuming. For example, if the built-in pedal pulsation damper becomes contaminated, the system becomes nearly impossible to bleed. In addition, it is especially difficult to remove air from the damper. The pre-filled system eliminates these difficulties.

Pre-Filled Master Cylinders

This system includes a master cylinder connected to the hydraulic line (includes male quick disconnect). The system must be used with the existing O.E.M. slave cylinder or with a dry slave cylinder purchased separately. This system is designed for applications that include a Concentric Slave Cylinder (CSC) inside the bell housing. In addition, the master cylinder is typically mounted at an angle that makes conventional bleeding difficult and time consuming. After installation of the clutch and pre-filled master cylinder, a two-minute procedure to fill the CSC is all that is required. By comparison, the Ford-approved bleed procedure on a dry system can take up to an hour or more. The quick disconnect is the vulnerable component in this system. It is prone to leak due to component deterioration, and the female portion (attached to the CSC) or male portion is routinely broken during removal because the proper removal tool was not used. Rather than installing a complete pre-filled system, replacing that portion of the quick disconnect that is damaged (master cylinder and hydraulic line or the CSC) reduces the overall cost.