Thanks for answering the driveshaft question sheldon, I have been pretty busy at work.

The rear can hold some power, I forget where the limit is reached off hand, but if you plan on modifying the car beyond stock turbo (230-250 whp) I would probably do the diff swap to be on the safe/reliable side. Good luck on your swap and if you have any questions I'm sure someone on here or rx7club can answer them as this has been done numerous times before.

- Chris