Noisy rearend 69 barracuda 318 car

How would you reset that? So what your saying is that could cause it to be noisy?
Pat
Was the rear noisey before. ? I've never rebuilt one, but years ago I destroyed an 8.75 w/3:91 gears and shortly before it went, I had done the same thing and the pinion gear was missing teeth after putting it in reverse one day. I was told that the crush sleeve will hold the pinion depth as it crushes slightly after being torqued. Someone one this site can tell you if this may be your problem