Seal - Pinion
9 1/4 Inch - REAR AXLE / PINION SEALREMOVAL
1. Raise and support the vehicle.
2. Remove the wheel and tire assemblies.
3. Mark the universal joint, companion flange and pinion shaft for installation reference.
4. Remove propeller shaft from the companion flange.
5. Remove the brake drums to prevent any drag.
6. Rotate companion flange three or four times and record pinion rotating torque with an inch pound torque wrench.
7. Install two bolts into the companion flange threaded holes, 180° apart. Position Holder 6719A against the companion flange and install and tighten two bolts and washers into the remaining holes.
8. Hold the companion flange with Holder 6719A and remove pinion nut and washer.
9. Remove companion flange with Remover C-452 (Fig. 29).
10. Remove pinion seal with pry tool or slide hammer mounted screw.
INSTALLATION
1. Apply a light coating of gear lubricant on the lip of pinion seal.
2. Install new pinion seal with Installer C-3860-A and Handle C-4171 (Fig. 30)
3. Install companion flange on the end of the shaft with the reference marks aligned.
4. Install two bolts into the threaded holes in the companion flange, 180° apart.
5. Position Holder 6719 against the companion flange and install a bolt and washer into one of the remaining threaded holes. Tighten the bolts so holder is held to the flange.
6. Install companion flange on pinion shaft with Installer C-3718 and Holder 6719.
7. Install pinion washer and a new pinion nut. The convex side of the washer must face outward.
CAUTION: Never exceed the minimum tightening torque 285 Nm (210 ft. lbs.) when installing the companion flange retaining nut at this point. Damage to collapsible spacer or bearings may result.
8. Hold companion flange with Holder 6719 and tighten the pinion nut with a torque set to 285 Nm (210 ft. lbs.) (Fig. 31). Rotate pinion several revolutions to ensure the bearing rollers are seated.
9. Rotate pinion with an inch pound torque wrench. Rotating torque should be equal to the reading recorded during removal plus an additional 0.56 Nm (5 inch lbs.) (Fig. 32).
CAUTION: Never loosen pinion nut to decrease pinion bearing rotating torque and never exceed specified preload torque. If rotating torque is exceeded, a new collapsible spacer must be installed.
10. If rotating torque is low, use Holder 6719 to hold the companion flange and tighten pinion nut in 3.5 Nm (5 ft. lbs.) increments until proper rotating torque is achieved.
NOTE: The bearing rotating torque should be constant during a complete revolution of the pinion. If the rotating torque varies, this indicates a binding condition.
NOTE: The seal replacement is unacceptable if the final pinion nut torque is less than 285 Nm (210 ft. lbs.).
11. Install propeller shaft with the installation reference marks aligned.
12. Tighten the companion flange bolts to 108 Nm (80 ft. lbs.).
13. Install brake drums, wheel and tire assemblies and lower the vehicle.
14. Check the differential lubricant level.