REMOVAL & INSTALLATION
See Figure 1
The following procedure applies to all 1988-91 4WD models only.
- Unbolt and remove the rear crossmember.
- Matchmark the differential and driveshaft flanges.
- Remove the four flange bolts, nuts and washers.
- Disconnect the driveshaft from the differential.
- With a hammer and a cold chisel, loosen the staked part of the locking nut.
- Using SST No. 09330-00021 or equivalent to hold the flange, remove the locking nut.
- Remove the plate washer.
- Remove the companion flange.
- Using a seal puller (SST 09308-10010) or equivalent, remove the front oil seal and then remove the oils slinger.
- Using a bearing puller (SST 09556-22010) or equivalent, remove the front bearing.
- Remove the front bearing spacer. Purchase a new spacer, bearing and oil seal as required.
- Install a new bearing spacer and bearing onto the shaft.
- Install the oils slinger onto the shaft.
- Using a seal driver, install the new oil seal to a depth of 0.078 inch (2mm).
- Coat the lip of the new oil seal with multi-purpose grease.
- Using the removal tool, install the companion flange.
- Install the plate washer.
- Coat the threads of the new nut with gear oil.
- Using the removal tool to hold the flange, tighten the companion flange to 80 ft. lbs. (108 Nm).
Check and adjust the drive pinion preload as follows:
- Using a inch lb. torque wrench, measure the preload of the backlash between the drive pinion and the ring gear. Preload for a new bearing is 9-14 inch lbs. (1-1.5mm) and 4-7 inch lbs. (0.4-0.7mm) for a used bearing.
- If the preload is greater that the specified limit, replace the bearing spacer.
- If the preload is less than specification, re-tighten the nut in 9 ft. lbs. (12 Nm) increments until the specified preload is reached. Do not exceed a maximum torque of 174 ft. lbs. (235 Nm).
- If the maximum torque is exceeded, replace the bearing spacer and repeat the bearing preload procedure. Preload CANNOT be reduced by simply backing off on the pinion nut.
- Stake the drive pinion nut.
- Align the driveshaft and differential flange matchmarks.
- Install the flange bolts and tighten to 54 ft. lbs. (73 Nm).
- Install the rear crossmember and tighten the retaining bolts to 53 ft. lbs. (71 Nm).
- Remove the differential FILL plug (the uppermost plug) and check the oil level. Fill the differential to the proper level with new API GL-5 hypoid gear oil.
- Install and tighten the fill plug with a new gasket. Tighten the plug to 29 ft. lbs. (39 Nm).
- Take the vehicle for a road test and inspect for leaks.