GMC 12471523 Seal,Differential Drive Pinion Gear

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Loosen the wheel lug nuts, raise the vehicle, place it securely on jackstands and remove the wheel. Remove the splash shield from under the front axle. Remove the left driveaxle. Drain the lubricant from the front differential. Disconnect the lower stabilizer bar link from the lower control arm. Pry the seal out with a seal remover or pull it out with a slide hammer and adapter. Drive in a new seal, using a seal driver or a socket slightly smaller in diameter than the seal. Lubricate the lips of the seal with multi-purpose grease. Fill the differential with the proper lubricant. Install the driveaxle. Reconnect the lower stabilizer bar link. Install the splash shield, if equipped. Install the wheel, lower the vehicle and check for proper operation. For the left side seal, remove the driveaxle. Drain the lubricant from the front differential. Pry the Differential Seal out of the end of the axle-shaft tube with a seal remover or pull it out with a slide hammer and adapter. Drive in a new Differential Seal, using a seal driver or a socket slightly smaller in diameter than the seal. Lubricate the lips of the Differential Seal with multi-purpose grease. Reinstall the driveaxle.

To remove the rear wheel, start by loosening the lug nuts and raising the rear of the vehicle on jackstands. Disconnect the driveshaft and secure it out of the way. Use an inch-pound torque wrench to check the torque required to rotate the pinion on semi-floating axles and record the reading. Make alignment marks on the pinion shaft, nut, and flange, and count the number of threads visible between the nut and shaft. Use a special tool or large pliers to loosen the self-locking pinion nut. Remove the nut and withdraw the companion flange, using a puller if necessary. Pry out the old seal and discard it. Lubricate the new seal and tap it into position with a seal installation tool or large socket. To install, align the mating marks and install the companion flange, tightening the pinion nut if needed. Apply non-hardening sealant to the spline ends on the flange. Install the washer and pinion nut, tightening it until the original number of threads are exposed. Measure the torque required to rotate the pinion and tighten the nut incrementally until it matches the recorded figure, slightly exceeding it to compensate for the new oil seal. Connect the driveshaft, install the wheels, and lower the vehicle, tightening the lug nuts to the proper torque.

To check the torque required to rotate the pinion on semi-floating axles, an inch-pound torque wrench should be used and the reading should be recorded.

RTV sealant.

The driveshaft.

After filling the differential with lubricant, you should install the driveaxle and reconnect the lower stabilizer bar link.