Pinion Oil Seal Removal

Replacement of the pinion oil seal involves removal and installation of only the drive pinion shaft nut and the companion flange.

CAUTION: This operation disturbs the pinion bearing preload, and this preload must be carefully reset when assembling.

1. Raise the vehicle and install safety stands. Remove the rear wheels and brake drums to prevent brake drag during drive pinion bearing preload adjustment.

Driveshaft Alignment Marks:

Driveshaft/Companion Flange Alignment Marks:

2. Mark the driveshaft axle end flange and the axle companion flange to insure proper position of the driveshaft during assembly. Disconnect the driveshaft from the rear axle companion flange. Remove the driveshaft from the transmission extension housing. Install an oil seal replacer tool in the transmission extension housing to prevent oil leakage.

Pinion Bearing Preload Check:

3. Install an inch pound torque wrench on the pinion nut. Record the torque required to maintain rotation of the pinion through several revolutions.

Pinion Nut Removal:

4. While holding the companion flange with Companion Flange Holding Tool, T57T-4851-B or equivalent, remove the pinion nut.

Companion Flange Alignment Marking:

5. Clean the area around the oil seal. Place a drain pan under the seal, or raise the front of the vehicle higher than the rear.

Mark the companion flange in relation to pinion so flange can be reinstalled in the same position.

Companion Flange Removal:

6. Using Remover Tool, T7OP-4221-A or equivalent remove the rear axle companion flange.

Pinion Seal Removal:

7. Remove the drive pinion oil seal.

CAUTION: Use care not to damage seal bore in housing.