- 1992-3 Viper, Borg Warner T-56 six -speed manual w/overdrive Gear
- 1994-5 have the same gear ratios but are for use with a 12 inch clutch
- 1996 (Roadster and GTS) same ratios - fully synchronized, with electronic 1 - 4 skip-shift and reverse lockout mechanism.

Ratios

1st:            2.66:1
2nd:            1.78:1
3rd:            1.30:1
4th:            1.00:1
5th:            0.74:1
6th:            0.50:1
Reverse:        2.90:1

F-Body (Camaro & Firebird) with T-56

Year    1993 (M28)    1993 (M29)    1994+ (MN6)

1st:       3.36          2.97          2.66
2nd:       2.07          2.07          1.78
3rd:       1.35          1.43          1.30
4th:       1.00          1.00          1.00
5th:       0.80          0.80          0.74
6th:       0.62          0.62          0.50

Aside from the Skip Shift provision and different gearing/input shaft (on the post 93's), all T-56s are basically the same.

1993 (M28) have a torque capacity of 360 lbs-ft.
1993 (M29) have a torque capacity of 400 lbs-ft.
1994 (MN6) have a torque capacity of 450 lbs-ft.

Corvette C5 gear ratios:

1st             2.66
2nd             1.78
3rd             1.30
4th             1.00
5th             0.74
6th             0.50
Reverse:        2.90

I think that the beefiest T-56 is the C5's.

"Corvette engineers kept the clutch assembly in it's normal location at the front of the car (mated to the engine's flywheel) to avoid conflict with the shift linkage. The downside is a tougher life for synchronizers inside the transmission, because they have extra rotating inertia and friction to manage during each shift. To increase synchronizer capacity and assure smooth shifting, a special three-cone design is used in both first and second gears. Third through sixth gears, and reverse, use double-cone synchronizers. These upgrades provide adequate surface area to properly synchronize both up and down shifts, while also reducing effort at the shift lever. The rear transaxle location means that the shift lever no longer emerges directly from the gear box into the driver's right hand."

Note: The torque ratings above are from the manufacturer. But if look closely Vipers, f-bodys and Corvettes have no problems with these transmissions even with 600+ HP. I think the best and most reliable transmission would be a Viper/F-body T-56 with Corvette T-56 internals. I am not sure if they are direct replacement (the internals that is)