Just put in a 9in with 4.11 and had the trans rebuilt less then 2000 miles. Broke the 10 bolt from wheel hop in 3erd gear. It wasn't at a track. So it wasn't. A high traciton lanch or any thing. But now with the 9 I get a really bad whinne when acclerting. Still using stock drive shaft with the u joint from moser. also having bad vibration at like 80. Could it be the drive shaft. And the pion angle is -2 if that helps.

 

Did you just put the 9" together, or did you make sure the gears were properly set and whatnot? I've heard that moser just kindof throws it together to move them out quickly, and that it's always a good idea to have the gears reset.

 

the whining noise is ur girlfriend telling u to slow down lol haha