Will a drive shaft from a 75 Cutlass with 400 trans work/fit in a 67 Cutlass with same trans? Thanks!

 

You need to measure your car to see what will and will not fit. I cant answer the question directly but I have found for what a new shaft costs its advantageous to get a new unit made. Go to Dennys Driveshafts for a visual on how to measure and ID which ujoints you have. Follow link click on diagram B.

http://www.dennysdriveshaft.com/how_to_measure.html

 

Both the wheelbase and the rear axle are different between those cars, so not even close.