Sorry if this has been asked before, I did look through prev post. I have a 75 280 w/a 200r diffy, I know 87-89 turbo posi's are interchangeable but what about 90-91? Or any others for that matter.

Thanks

I beleive the 90+ cars have R230's. This will require some work to convert to use in your car.

This thread goes into the details of the various rear end choices nicely...

Differential / CV / LSD / HP / Torque / R160 / R180 / R200 / R230 / Diff Mount - HybridZ

90-96 300zx have short nose R200's ! Techno Toys Tuning and Modern Motorsports sells a kits to allow it fit correctly. Or you fab you own mount kit.

Check the HybridZ thread above.