also were all 93+ driveshafts aluminum...
also is it the sameone in an automatic as a five speed?

I know stupid question, but just checking.

 

These driveshafts will fit nicely. I have newer aluminum DS on mine, with manual tranny. They are 3" diam as well, and should work fine with auto tranny as well. I would look for aluminum, either from 3rd gen, or lt1/ls1. Hope this helps,
Joe

 

All LS1 cars come with an aluminum driveshaft, in the 3" variety. I believe the 97 cars got the 1LE (2.75" diameter), but all 93-96, non 1LE cars got a steel driveshaft. It will bolt right up, with no modification. I have a 95 formula, with a 1LE shaft from an 88 formula.