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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra - 2WD 🢒 Driveline/Axle 🢒 Rear Drive Axle 🢒 Locking Differential Cam Unit Assemble

Locking Differential Cam Unit Assemble 8.6 Inch Axle


    Object Number: 789220 Size: SH
  1. Apply axle lubricant, GM P/N 12378261 (Canadian P/N 10953455) or equivalent meeting GM Specification 9986115, to the surface of each disc.
  2. Assemble the left side or the flange-end side locking differential side gear cam unit and clutch disc assembly as follows:
    3. 2.1. Install the cam plate (2) to the cam side gear (1).
    2.2. Install the carbon-faced eared disc (3).
    2.3. Install the fuse disc (4).
    2.4. Install the 1st non-carbon eared disc (7).
    2.5. Install the 2nd non-carbon eared disc (8).
    2.6. Install the wave washer (5).
    2.7. Install the 1st splined disc (9).
    2.8. Install the 3rd non-carbon eared disc (10).
    2.9. Install the 2nd splined disc (11).
    2.10. Install the 4th non-carbon eared disc (12).
    2.11. Install the 3rd splined disc (13).
    2.12. Install the 5th non-carbon eared disc (14).
    2.13. Install the retaining ring (15).

    Compress the clutch disc assembly and align the teeth on the 3rd splined disc with the teeth on the cam plate in order to seat the retaining ring in the groove on the cam side gear.

    2.14. Install the guide clips (2) to the clutch disc assembly.

    Apply chassis grease, GM P/N 12377985 (Canadian P/N 88901242) or equivalent, to the guide clips in order to hold the clips in place on the disc ears.

Locking Differential Cam Unit Assemble 9.5 Inch Axle

Tools Required

J 29710 Differential Side Bearing Installer


    Object Number: 797776 Size: SH
  1. Apply axle lubricant, GM P/N 12378261 (Canadian P/N 10953455) or equivalent meeting GM Specification 9986115, to the surface of each disc.
  2. Assemble the left side or the flange-end side locking differential side gear cam unit and clutch disc assembly as follows:
    3. 2.1. Install the cam plate (2) to the cam side gear (1).
    2.2. Install the carbon-faced eared disc (3).
    2.3. Install the fuse disc (4).
    2.4. Install the wave washer (5).
    2.5. Install the 1st non-carbon eared disc (7).
    2.6. Install the 2nd non-carbon eared disc (8).
    2.7. Install the 1st splined disc (9).
    2.8. Install the 3rd non-carbon eared disc (10).
    2.9. Install the 2nd splined disc (11).
    2.10. Install the 4th non-carbon eared disc (12).
    2.11. Install the 3rd splined disc (13).
    2.12. Install the 5th non-carbon eared disc (14).
    2.13. Align the splined discs with the teeth on the cam plate in order to compress the clutch disc assembly.
  3. Install the thrust sleeve (15) onto the cam side gear.

    4. Object Number: 886079 Size: SH
  4. Install the thrust sleeve onto the cam side gear using a hydraulic press and the J 29710 , if necessary, until the thrust sleeve is fully seated onto the locking differential cam gear.
  5. If the cam side gear or the thrust sleeve has been replaced, measure the overall length of the gear assembly by doing the following:
    6. 5.1. Place the locking differential clutch disc thrust washer on top of the thrust sleeve.
    5.2. Measure the overall length of the gear assembly from the front of the cam side gear to the back of the locking differential clutch disc thrust washer.
    5.3. Compare this measurement to the measurement obtained during disassembly.
    5.4. If the new reading is more than 0.762 mm (0.003 in) higher or lower than the original, select a locking differential clutch disc thrust washer that will return the reading closest to the original reading.
  6. Align the ears of all the clutch discs.
  7. Install the guide clips to the clutch disc assembly.

    8. Apply chassis grease, GM P/N 12377985 (Canadian P/N 88901242) or equivalent, to the guide clips in order to hold the clips in place on the disc ears.

Locking Differential Cam Unit Assemble 10.5 Inch Axle

Tools Required

J 29710 Differential Side Bearing Installer

  1. Apply axle lubricant, GM P/N 12378261 (Canadian P/N 10953455) or equivalent meeting GM Specification 9986115, to the surface of each disc.

    2. Object Number: 797863 Size: SH
  2. Assemble the right side locking differential side gear cam unit and clutch disc assembly as follows:
    3. 2.1. Install the cam plate (2) to the cam side gear (1).
    2.2. Install the carbon-faced ear disc (3).
    2.3. Install the fuse disc (4).
    2.4. Install the wave washer (5).
    2.5. Install the 1st non-carbon eared disc (7).
    2.6. Install the 2nd non-carbon eared disc (8).
    2.7. Install the 1st splined disc (9).
    2.8. Install the 3rd non-carbon eared disc (10).
    2.9. Install the 2nd splined disc (11).
    2.10. Install the 4th non-carbon eared disc (12).
    2.11. Install the 3rd splined disc (13).
    2.12. Install the 5th non-carbon eared disc (14).
    2.13. Align the splined discs with the teeth on the cam side gear in order to compress the clutch disc disc.
  3. Install the thrust sleeve (15) onto the cam side gear.

    4. Object Number: 886080 Size: SH
  4. Install the thrust sleeve onto the cam side gear using a hydraulic press and the J 29710 , if necessary, until the thrust sleeve is fully seated onto the cam side gear.
  5. If the cam side gear or the thrust sleeve has been replaced, measure the overall length of the gear assembly by doing the following:
    6. 5.1. Place the locking differential clutch disc thrust washer on top of the thrust sleeve.
    5.2. Measure the overall length of the gear assembly from the front of the cam side gear to the back of the locking differential clutch disc thrust washer.
    5.3. Compare this measurement to the measurement obtained during disassembly.
    5.4. If the new reading is more than 0.762 mm (0.003 in) higher or lower than the original, select a locking differential clutch disc thrust washer that will return the reading closest to the original reading.
  6. Align the ears of all the clutch discs.
  7. Install the guide clips to the clutch disc assembly.

    8. Apply chassis grease, GM P/N 12377985 (Canadian P/N 88901242) or equivalent, to the guide clips in order to hold the clips in place on the disc ears.