Ok I just got done replacing my tranny and clutch in my 83 Vert about 3 weeks ago. Everything went smooth other than the stupid pilot bushing. I have been very good as far as not beating on her for the past couple of weeks. I imagine most of you can see where this is going... So I'll make a long story short. After work last Saturday my co-worker had said that the fat burnout I did in the morning before work didn't count because he didn't see it. (insert peer pressure here) So I decided to oblige him with a repeat performance. Well needless to say I revved to about 3k while rolling, sidestepped the clutch and immediately heard a *bang, clang, tink, tink, tink, ect... from the rear. As I am stitting in my newly fixed Stang the though goes through my head, "awww [email protected]! I hope that wasn't the tranny!" So my co worker, who watched all this go down, walks over and asks what happened. I'm like, dunno man. So I get out of the car and look underneath to see if anything came loose. nothing hanging down, nothing leaking, no puddles. Good sign so far. So I ask him to look at the rear as I put it in reverse and he starts yellin "STOP STOP!" I 'm like what, why? He says "Dude your rear end is twisting." So my question is... What do you think I did? Shear a couple of teeth off the pinion or ring gears or do you think it is more than that? I haven't had a chance to pop the cover off the diff to find out. Also being that my Stang is an 83 with the original rearend do you think it is a 7.5"? I know it is a locking rear, I've left my fair share of equal length black marks on fresh asphalt. :smilie I have located another rearend at my local junk yard but I can't tell if it is an 8.8 or a 7.5. I have tried looking at the axle tag but I cannot read it. It does have extra shocks on it that mine doesn't. They look like kicker shocks for axle wrap. Could this be an 8.8?