Disassembly

FIG. 2 Four Pinion Limited-Slip Differential-Model 702U and 7OHD Powerlok. Design with Radial Grooves on Plates, Outer Dished Plate, and One Dished Disc per Clutch Pack (See Fig. 16 for Newer Design):

FIG. 16 Limited-Slip Differential (Model 70)-Exploded View. Design with Special Surface Coating on Plates, Two Dished Discs, and Flat Plates:

Refer to Fig. 2 if the plates have radial grooves, or to Fig. 16 if then newer design with specially coated plates and a different configuration of dished plate and disc surfaces.

The differential bearings need not be removed to overhaul the limited-slip differential.

FIG. 14 Case and Mate Shaft Markings (Model 70):

1. Mark the ring gear half and cover half of the differential case so that they can be re-assembled in the same relative positions. Mark the pinion mate shafts and their corresponding ramps so that they too can be re-assembled in the same positions (Fig. 14).

2. Clamp the differential assembly in a soft-jawed vise and loosen, but do not remove the bolts that hold the case halves together.

FIG. 15 Removing Cover Half of Case:

3. Place the differential assembly on the bench with the ring half of the case down. Remove the case attaching bolts, and then remove the cover half of the case (Fig. 15) on Model 70 differentials.

FIG. 16 Limited-Slip Differential (Model 70)-Exploded View. Design with Special Surface Coating on Plates, Two Dished Discs, and Flat Plates:

4. Remove the pinion mate gear, side gear ring, and clutch pack (Fig. 16). keep these parts with the cover half of the case so that they can be reinstalled in their original positions.

5. On Model 70 differentials, remove the corresponding parts from the drive gear half of the case.

6. On all models, clean all parts thoroughly and dry them with compressed air.

7. Inspect the clutch plates and discs for cracks, excessive wear, and distortion. If one or more of the plates, or discs need replacing, it is suggested that the entire stack of clutch plates on each side be replaced.

FIG. 17 Components to Check for Excessive Wear or Scoring:

Inspect all other parts and replace any part that appears to be worn or damaged (Fig. 17).

8. Inspect the pinion mate shaft surfaces and the ramp surfaces on the case for excessive wear or pitting.

9. Inspect the side gear and pinion gear teeth. Inspect the pinion gear races that bear on the side gear rings. Inspect the corresponding surfaces on the side gear rings.