Your pinion angles are screwed up.Do a search and find the correct way to measure the angles.You do not put an angle finder on the driveshaft to figure it out.You have to zero out the back of the tranny to the rear housing. My own truck is 5 degree's. So the tranny is 5degree's negative and the rear is 5 degree's positive.This gives a 0 degree pinion angle.

 

That's not good! I am pretty close to getting rid or this thing myself.

 

i have the same problem...my tahoe is lowered 3 inches all around and it has that same noise you were talking about... if you figure something out Please tell me.

 

I did some pinion angle searching and it seems there are many different opinions on how to measure the angles and what those angles should be. I will be remeasuring my angles using the transmission output shaft yoke and the pinion yoke tomorrow and see what that looks like.

 

I haven't had time to check the angles with the new method yet due to work but I will do so this weekend and post the results.

 

ok sweet, i cant check mine cause i cant lay under the thing and im not able to use a garage for free. but i will check it when i go home.