Rear End Destruction.

[EFI70Blazer]

Originally Posted by VDOG

My original shims, one side would slide in no problem, the other side was too thick. Thus my reasoning for a shim kit. I checked the numbers on both carriers and they match. I did have an aligment problem which I why I thought I needed a shims. With it being the same ring and pinion could a simple adjustment be the cure all to my noise problem?

You may need to adjust your backlash. Idealy you want to have .008 - .010 of clearance between your gears. You will need a dial guage on a magetic base to check this. You then adjust by moving shims from one side to the other. The total thickness of the shims needs to stay the same. To space the ring gear further away you will need to remove a shim or shims from the drivers side to the passenger side. If you have factory thick shims you will need a shim kit to get the backlash right. You should then check your gear mesh to make sure it is still right. Use some gear marking compound on about 5 teeth and rotate it both ways under pressure. You need to have a pattern that is the same length in the top of the tooth as the bottom of the tooth. Here is a diagram for reference.


One other quick note. Your carrier caps need to stay on the side they were removed from, since they are machined after being installed. Mark them before you remove them or they may get mixed up.