I wouldn`t go to the trouble of changing either one out! have you ever needed one? there is going to be a lot of problems surface if you ever loose a joint under full power. I lost one a t 128 mph one time, tore the back of the trans off-shaft came out in short pieces after beating hell out of everything under the car, finally cut the right rear 16x32 slick. w/ 7 lbs of air in the other slick, and 48 in the fronts, you can imagine what kind of ride it was. didn't roll it tho! :coffee2:
