LOL.. ps...I've stalled them due to overheating. Still didn't hurt anything. The 3800 can be an amazing motor. That aside..I'm not a guy to stand in the way of a dude wanting to upgrade and have more fun. Party on Garth
The 4T65E diff was different in 1997 than 98+. The difference is that in 97 the output shaft did not have a compression clip to hold the diff to it. It had a circlip. This circlip has to be removed to get the diff off the output shaft and I think maybe the output shaft splines are slightly different as well.