I have a 1986 Vette with a 700R4 that will need a rebuilding in the near future. I also have a 1987 700R4 out of a 350 L-98 GTA (F-body), I want to rebuild the 1987 GTA transmission and then swap it into my Vette. A visual inspection of the two transmissions reveals that the rear tail shaft where the torque arm hooks up is different between the two transmissions. Does anyone know if I can just switch the tail shafts between the two transmissions or do I also need to switch the output shafts and any related hardware? I plan to rebuild the GTA transmission with all high performace parts to handle my new engine power. I would really like to just switch the two transmissions and the tail shafts when I decide to swap. If I have to tear appart both transmissions to make on good transmission I will just rebuild the Vette transmission and live with the down time.

Thanks

 

If memory serves you should be able to switch the tailshafts without a problem. The output shaft length should be the same for each trans. The only problem you may run into is the type of speedo drive you have either mechanical or electric.

 

The Corvette tail shaft & output shaft are shorter.