Jeep® CJ Rebuilder's Manual:
1972 to 1986
by Moses Ludel
Fig. 5-127. While feeler gauge readings were between the outer edge of bearing cups and the axle housing (with no shims in place), shims install inboard of bearings. Shims provide the correct bearing preloads and gear backlash. Oil bearing cups, and tilt the cups slightly to start installation of the carrier. Tap evenly.
Chapter 5: Axle Rebuilding and Upgrades - Installing an Aftermarket Locker