Need some assistance installing locker in 12 bolt

[Bigdav160]

Did you mark the caps? It's critical that they go back on exactly how they came off. Top/bottom Left/Right.

Pry the ring gear and case out. Keep track of what shim came out of the left and right.

Unbolt the ring gear. Look at the bolt head. Does it have an "L"? Left hand threads. Tap on the edge of the ring gear with a brass drift. Or thread the bolts on half way and gently tap them until the ring gear comes off the case.

Make sure everything is spotless clean. Bolt it to the new case. Torque the bolts
Install the case with old shims and check the backlash. If the backlash is good run a pattern check. Most likely it'll be acceptable.

Pinion depth does not change with case replacement.

[Mrturner1]

Originally Posted by Bigdav160

Did you mark the caps? It's critical that they go back on exactly how they came off. Top/bottom Left/Right.

Pry the ring gear and case out. Keep track of what shim came out of the left and right.

Unbolt the ring gear. Look at the bolt head. Does it have an "L"? Left hand threads. Tap on the edge of the ring gear with a brass drift. Or thread the bolts on half way and gently tap them until the ring gear comes off the case.

Make sure everything is spotless clean. Bolt it to the new case. Torque the bolts
Install the case with old shims and check the backlash. If the backlash is good run a pattern check. Most likely it'll be acceptable.

Pinion depth does not change with case replacement.

I didn't mark them but I'm 90% positive that I placed them on the towel exactly how they came off. I know for sure I have the left and right, but I could have one upside down. What happens if one is flipped?

[cdowns]

b4 doing ANYTHING it's a great idea to get the service manual and follow the directions that gm put in their service manual to do things right