Six Speed Transmissions (GM & Ford)
These are the T-56 six speed transmissions for the Ford Mustang, GM Camaro and Firebird, Chevrolet Corvette, and the aftermarket GM unit.
Originally built by Borg-Warner, these units are now manufactured by Tremec. We are stocking the full T-56 line, as well as developing an exciting new prospect for the GM aftermarket T-56. Check below for applications for the more popular units. Also new in are the units and parts for the latest model Mustang Cobra T-56 6 speed units. We stock anything you might need for these units!
Features:
- Double overdrive provides extended ratio coverage and allows for closer ratio steps
- Aluminum die cast housings for reduced weight
- Tapered roller bearings on main and countershafts reduce noise and improve durability
- Needle bearing under all speed gears improve high speed performance and reduce shift effort
- Advanced synchronizer technology
- Powdered steel core blocker rings
- Engineered friction materials for improved durability
- Multiple cone synchronizer design for lower shift effort and increased capacity
- Patented strut-type synchronizer design for improved durability
- Constant mesh synchronized reverse
- Internal, single-rail shift system
- Integral clutch adaptor with front cover end-loading design for increased driveline bending strength and greater application adaptability
- Multiple shift lever locations
Application |
Part Number |
---|---|
Aftermarket Mustang, 5.0L – w/ mechanical speedo |
1386-000-012 |
4.6L Mustang – w/ mechanical speedo |
TUET 1259 |
4.6L Mustang – w/ electronic speedo |
TUET 1260 |
Aftermarket GM – for T5 replacement only |
1386-000-011 |
*Aftermarket GM – with modified plate for vertical app. |
1386-000-011MP |
*Aftermarket GM – w/ shifter modified for 4sp replacement application |
1386-000-011MS |
Firebird, Camaro thru 1997 |
1386-000-016 |
’98 Firebird, Camaro |
1386-000-017 |
’98 Firebird, Camaro w/ Hurst shifter |
1386-000-020 |
Chevrolet Corvette |
1386-000-023 |
Aftermarket ’96 Viper Coupe – No longer Available |
N/A |
* WE ARE THE EXCLUSIVE DEALERS FOR THESE UNITS
*** We also keep in stock a large inventory of remanufactured T56 units.
*** They are priced well for exchange, depending on application.
New items for the T-56 now in stock:
![]() McLeod Clutch Sets |
![]() Tremec 6 sp. shift ball |
![]() T-56 to 4 speed bell adaptor plate kits |
![]() Custom shift lever service |
![]() Special wiring pigtails |
![]() Mech. speedo extension, GM |
Aluminum Offset Shifters

We can usually rebuild your transmission for less than exchanging it. All of our new and rebuilt transmissions carry a 12mo/12,000 mile warranty. Send us your transmission, transfer case, or differential & we'll disassemble, clean & inspect it. Next, we'll contact you with an exact price to repair the unit, including all parts and labor. After you approve the work, we can usually complete the repairs in 3-4 business days.

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