Differentials - Eaton Locking: Overhaul GMC Envoy I

Disassembly (Cam Unit)

Remove retaining ring with snap ring pliers. Remove clutch plates, guide clips and wave washer. Remove cam plate and left side gear.

Reassembly (Cam Unit)

Install cam plate on side gear. Install wave washer. Install clutch plates in alternating sequence (8 on 7 5/8" ring gear and 10 on 8 1/2" ring gear). see scheme 1 Install retaining ring. Use grease to hold guide clips in place. Install guide clips on clutch plates.

Reassembly (Differential)

1. Install thrust washer and left side gear (cam unit) in tocase. Install thrust washer for right side gear into case. Install clutch pack for right side gear. Install clutch plates in alternating sequence. see scheme 1
2. Use grease to hold guide clips in place. Install guide clips onto clutch plates. Install right side gear, thrust block, thrust washers and pinion gears. Install pinion gears into case, 180 degrees apart.
3. Rotate pinion gears and thrust block into case. Ensure open side of thrust block faces small window opening. Install pinion shaft and NEW lock screw. DO NOT tighten lock screw to specification at this time.
4. Place governor assembly and latching bracket into case. Place straight end of latching bracket spring over and outside governor assembly shaft. (Scheme 2)
5. Install governor assembly and latching bracket bushing. Latching bracket bushing has a tapered hole; governor bushing has a straight hole. Press governor bushing into case to set shaft end play at.004-.020" (.10-.51 mm). Press latching bracket bushing into case so no shaft end play exists. Once unit is installed, tighten lock screw to 37 ft. lbs. (51 N.m) on 9 1/2" ring gear, or 27 ft. lbs. (37 N.m) on all others.

Scheme 2

Disassembly (Differential)

1. With differential removed from housing, remove ring gear and side bearings. Remove screws from front face of ring gear flange. Place differential on right half.
2. Using a screwdriver, gently pry differential case halves apart at yoke hole locations. Remove left half. Hold thumb against inside of gear hub when separating differential case halves to prevent left side gear from falling out.
3. Remove governor and latching bracket assemblies. (Scheme 3) Remove left side gear, clutch plates, guide clips and thrust washer. Remove reaction blocks, pinion yoke, pinion gears and pinion thrust washers.

Scheme 3

1. Remove right side gear and side gear thrust washer. Measure and record overall length of gear assembly from front of gear to back of thrust sleeve, including side gear thrust washer. (Scheme 3)
2. Using press and Bearing Remover (J 22912-01), press thrust sleeve from right side gear. Separate clutch plates, guide clips, wave spring and cam plate from right side gear. (Scheme 4)

Scheme 4

1. Install cam plate onto right side gear. Install wave spring and clutch plates. Install clutch plates in alternating sequence. (Scheme 4)
2. Press thrust sleeve on right side gear until sleeve is even with surface of right side gear disc splines.
3. Use grease to hold guide clips in place. Install guide clips onto clutch plates. If side gear or thrust sleeve were replaced, measure and record overall length of gear assembly from front of gear to back of thrust sleeve, including side gear thrust washer.
4. Compare new measurement with original measurement taken during disassembly. If difference between measurements is.003" (.07 mm) or more, install NEW side gear thrust washer to obtain reading nearest original measurement.

1. Install right thrust washer and right cam unit. Install reaction blocks, reaction block thrust washer, pinion yoke, pinion gears and pinion thrust washers.
2. Install left thrust washer and clutch plates in differential case half. Ensure clutch plates are installed in alternating sequence. (Scheme 3) Install left side gear and latching bracket assembly.
3. Install governor assembly. Ensure straight end of latching bracket spring is over and outside governor assembly shaft. (Scheme 2) Hold left side gear in differential case half, and install case halves together. Install and tighten retaining bolts. Install ring gear and differential side bearings.