Drive Pinion Preload Check

1. Measure original preload shims and replace with new shims of equal size.

2. Install the pinion into the carrier.

3. Install new preload shims over the pinion. Install the outer pinion bearing cone and oil slinger.

4. Assemble end yoke, washer, deflector, and slinger on pinion shaft and align with special Tool T83T-4851-A and T78P-4851-A, Companion Flange Holder (or equivalents) to seat the yoke (Fig. 53). Install a new pinion nut and tighten nut to 271-298 Nm (200-220 ft. lb).

5. Rotate pinion nut with an inch-pound torque wrench. Rotating torque should be 2.25-4.52 Nm (20-40 in-lbs). To increase preload, remove shims. To decrease preload, add shims.

6. Install the Gauge Tube, D8OT-4020-F47 (for Model 44 axles) or T8OT-4020-F41 or equivalents (for Model 50 axles). Install bearing caps and tighten to 108-122 Nm (80-90 ft-lbs).

7. With the drive pinion at the correct depth, remove the yoke with Holding Tool, T78P-4851-A and Yoke Remover, T65L-4851-B. Remove the yoke, nut and washer.

FIG. 52 Pinion Oil Seal Installation:

8. Coat the oil seal with Hypoid Gear Lubricant, C6AZ-19580-E (ESW-M2C105-A) or equivalent. Install the drive pinion oil seal with T8OT-4000-C, Oil Seal Replacer (Fig. 52). After installation, make sure the garter spring didn't pop out. If the garter spring pops out, remove and replace the seal.

FIG. 53 End Yoke Installation:

9. Install the yoke with Companion Flange Replacer, T83T-4851-A (Fig. 53). Install washer and nut and tighten nut to 271-298 Nm (200-220 ft-lbs).