Wrangler 4WD L4-150 2.5L VIN P MFI (1998)
Carrier Bearings: Adjustments
181 FBI Axle
INTRODUCTION
Axle Adjustment Shim Locations
Differential side bearing preload and gear backlash is achieved by selective shims positioned behind the differential side bearing cones. The proper
shim thickness can be determined using slip-fit dummy bearings D-348 in place of the differential side bearings and a dial indicator C-3339. Before
proceeding with the differential bearing preload and gear backlash measurements, measure the pinion gear depth and prepare the pinion gear for
installation. Establishing proper pinion gear depth is essential to establishing gear backlash and tooth contact patterns. After the overall shim thickness
to take up differential side play is measured, the pinion gear is installed, and the gear backlash shim thickness is measured. The overall shim thickness
is the total of the dial indicator reading and the preload specification added together. The gear backlash measurement determines the thickness of the
shim used on the ring gear side of the differential case. Subtract the gear backlash shim thickness from the total overall shim thickness and select that
amount for the pinion gear side of the differential. Differential shim measurements are performed with axle spreader W-129-B removed.
SHIM SELECTION
NOTE: It is difficult to salvage the differential side bearings during the removal procedure. Install replacement bearings if necessary.
1. Remove differential side bearings from differential case.
2. Remove factory installed shims from differential case.
3. Install ring gear on differential case and tighten bolts to specification.
4. Install dummy side bearings D-348 on differential case.
5. Install differential case in axle housing.
Tighten Bolts Holding Bearing Caps
6. Install the marked bearing caps in their correct positions. Install and snug the bolts.
