REMOVAL & INSTALLATION
See Figures 1 and 2
Special tools are needed for this job.
- Raise and support the vehicle and remove the rear wheels and brake drums, or calipers.
- Mark the driveshaft end yoke and axle companion flange for reassembly reference. Disconnect the driveshaft from the rear axle companion flange, and remove the driveshaft from the transmission extension housing. Temporarily plug the extension housing to prevent oil leakage.
- With a socket on the pinion nut and an inch lb. torque wrench, rotate the drive pinion several revolutions. Check and record the torque required to turn the drive pinion.
- While using a flange holding tool to steady the companion flange, remove and discard the pinion nut.
- Clean the area around the oil seal. Place a drain pan under the seal, or raise the front of the car higher than the rear.
- Mark the companion flange and the drive pinion shaft for reassembly reference.
- Remove the companion flange with Companion Flange Remover T65L-4851-B, or equivalent puller.
- Lift out the pinion oil seal using grease seal remover TOOL-1175-AC and a slide hammer, or their equivalent. If necessary, pry the seal out of its housing.
- Clean and inspect the oil seal seating surface, and replace with a new one if the surface is pitted, grooved, or otherwise damaged.
- Before installing the new seal, coat the lip of the seal with rear axle lubricant.
- Install the seal, using Pinion Seal Replacer T79P-4676-A or equivalent, to drive it into place.
- Install the companion flange on the pinion shaft. Align the marks made on the pinion shaft and flange during disassembly.
The companion flange must not be hammered upon, or assembled with power tools.
- Install a new pinion nut. Tighten the nut until endplay is removed from the pinion bearing. Do not overtighten.
- Check the torque required to turn the drive pinion. The pinion must be turned several revolutions to obtain an accurate reading.
- Tighten the pinion nut to obtain the torque reading observed during disassembly (Step 3), plus 5 inch lbs. Tighten the nut minutely each time, to avoid overtightening. Do not loosen and then retighten the nut. Pinion preload should be 8-14 inch lbs. (1-2 Nm).
If the desired torque is exceeded, a new collapsible pinion spacer sleeve must be installed and the pinion gear preload reset.
- Remove the plug from the extension housing, and install the front end of the driveshaft on the transmission output shaft.
- Connect the rear end of the driveshaft to the axle companion flange, aligning the index marks made during disassembly. Tighten the four bolts to 70-95 ft. lbs. (95-128 Nm).
- Add rear axle gear lubricant, if necessary, to bring the level to the bottom of the filler hole, and tighten the filler plug to 15-30 ft. lbs. (20-41 Nm). Remove the drain pan, if applicable.
- Install the rear brake drums, or calipers, and wheels.
- Lower the vehicle.