T56 questions...

[Stangman]

My friend who is doing the 351 RX7 swap is considering going with a T56 instead of a T5, because it will bring the shifter back where it needs to be... But he and I do not know the difference in all the T56's available... so what is the difference in the Cobra, GM, and Viper T56's? Which one would be best for his application???

[boostanggt]

The GM cars use a 26 spline input, where the Fords use a 10. LT1 ratios are 2.66/1.78/1.30/1.00/.74/.50 and they use a 27 spline output where Fords are 31.

The 03 Cobra tranny is not quite Viper spec. It has the 10 spline input, with ratios 2.66/1.78/1.30/1.00/.80/.63

Not too sure on other exact specs.

[Stangman]

But a GM trans can be used just as easy? with the addition of a 26 spline clutch disc...

[Buckeye]

No the input is shorter and they do not make a gm t56 into ford sb bell so the front cover needs changed as well

[Stangman]

front cover as in the bearing retainer? So a bearing retainer and input shaft and it will work?

[Stangman]

:bump:
help please. I really wanna get a t-56 in this car, but the $1500.00 difference between the tranny's is hard to justify

[5.0calypso93lx]

Front cover, meaning the mid plate. T-56's have an extra plate on them in between the bellhousing itself and the main trans case. The main trans case is not sealed on the front like 5 speeds.

You can swap the midplate with a cobra or viper midplate and then use a quicktime bellhousing. You'll need to swap the input shaft and I believe the tailhousings are different as well, so shifter position is also different on the GM's.

You also need to see if it's a mechanicl or electronic speedo. That can be another issue as well.

If all he is wanting a T-56 for is shifter position, that's an awful lot of work for a VERY minimal difference. Keep in mind, viper and ford T-56's will come right up through the stock shifter location on a fox.

[Buckeye]

front cover as in the bearing retainer? So a bearing retainer and input shaft and it will work?

The lt1 box I have is a early model one that Rpm say I can swap those two out with cobra oe parts and it will work. BUT A: I have npt done it yet to verify and B: mine is a very early model box so it may be differant.

[5.0calypso93lx]

The lt1 box I have is a early model one that Rpm say I can swap those two out with cobra oe parts and it will work. BUT A: I have npt done it yet to verify and B: mine is a very early model box so it may be differant.

You will be fine, but you have to change the tailhousing also I believe for proper shifter location.

[Buckeye]

well mine is goimg is in a 68 cougar so who knows