I have a USDM 92 GSR cable tranny. it is possible to put a ITR or 94 & up GSR final dive into it? Or a JDM S1???

 

Any particular reason you're thinking of doing this? The USDM 94+ GSR and USDM ITR have the same final drive ratio as the 92-93 GSR.

Anyway, you would need to replace the differential (carrier and ring gear) and the countershaft minimum (not sure if the gears swap over to the new countershaft - my guess is that they would), as well as do some grinding inside the case to clear the larger diff carrier.