I just got a 90 without turbos. its got 180k on it and runs good. I'll put a new engine with some mods in when the time comes. For now I'm about to rebuild the manual transmission. It needs a complete bearing kit, clutch, and syncros. Im goona put in an alluminum flywheel too. This is my third rx7....theyve all needed syncros, does anyone know why? I dont know much about trannys. I would like to beef up the tranny, so it's ready for a faster engine down the road. I've heard some guys put the turbo trannys in their cars. What kinds of mods can I do to make my tranny shift better, last longer, and handle a more powerful engine? Who makes high quality parts for my tranny? Should I just buy a new or rebuilt tranny or turbo tranny?

 

Redline MT-90 fluid. Pricey, but all the big dogs use it. Buy a rebuilt or newer (>100k miles) TII tranny. Heavier, but stronger. You will also have to buy a TII driveshaft (or an automatic one) and a TII differential/halfshafts. Just ask SonicRaT. He just did this.