Hi,
When you replace the ring and pinion, there is a crush sleeve on the pinion shaft, and it requires shims during setup. The shims are to properly set up the ring gear bearing preload.
If you look below, the first pic shows the crush sleeve. The remaining pics include the directions for installing and adjusting the ring gear via the shim pack.
Let me know if this helps or if you have other questions.
Take care,
Joe
See pics below.
Images (Click to enlarge)
Jun 2, 2021 at 6:44 PM