86 na rear to 91 turbo rear
 

Can this be done? I want the 4:30 gears out of a turbo instead of the 4:10. I will convert it if needed. Does anyone know of anyone else doing this to a 86 na rx7. Or if there is any write ups on what needs to be changed out. Thanks Robert (i already have 4 piston converstion for the front. Thanks Rob

You're going to break the non-turbo rear end.
Plus, it isn't a drop in, as the pinion snout is different (length), and the pinion flange bolt pattern is different.

Mazda (Comp / Speed) does offer a 4.30 gear set, which some of the J-Spec FC's came with stock.
I think this is an easier option?


-Ted

enlighten me what will that do for performance exactly? sorry noobie here

slightly better acceleration without having to change engine output.