Differential replacement replacement instructions please?

Welcome to 2CarPros.

We got two problems. The sensors are wheel speed sensors and you won't get the ABS/traction control lights off. It can't be bypassed.

Next, you can't have two different gear ratios on a 4wd. The front wheels will want to turn faster than the rear which is going to damage the transfer case and other components.

As far as bleeding the brakes, I'm not sure what is happening. The system really hasn't changed. Are you getting anything from the rear brakes?

Let me know.

Joe

Here is how to change the rear differential out

Rear Axle Replacement (15 Series)

Removal Procedure

1. Raise the vehicle.
2. Place jack stands or utility stands, such as GMDE 123-B67313, at the front-end of the vehicle.
3. Support the rear axle with jack stands.
4. Remove the tire and wheel assemblies.
5. Disconnect the rear axle vent tube.
6. Disconnect the wheel speed sensor connector.
7. Remove the propshaft. Refer to Rear Propeller Shaft Replacement.
8. Disconnect the left-rear park brake cable from the rear axle.
9. Disconnect the right-rear park brake cable from the rear axle.
10. Remove the caliper assemblies from the rear axle.
11. Remove the stabilizer shaft from the rear axle.
12. Remove the crossover brake pipe from the rear axle.
13. Remove the coil springs. Refer to Coil Spring Replacement.
14. Disconnect the track bar from the rear axle.
15. Disconnect the lower control arm from the rear axle.
16. Disconnect the upper control arm from the rear axle.
17. Remove the rear axle assembly from the vehicle.

Installation Procedure

1. Install the rear axle assembly to the vehicle.
2. Connect the upper control arm to the rear axle.
3. Connect the lower control arm to the rear axle.
4. Connect the track bar to the rear axle.
5. Install the coil springs. Refer to Coil Spring Replacement.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

6. Install the crossover brake pipe to the rear axle.

Tighten
Tighten the bolt to 22 Nm (16 lb ft).

7. Install the stabilizer shaft to the rear axle.
8. Install the caliper assemblies to the rear axle.
9. Connect the right-rear park brake cable to the rear axle.
10. Connect the left-rear park brake cable to the rear axle.
11. Install the propshaft. Refer to Rear Propeller Shaft Replacement.
12. Connect the wheel speed sensor connector.
13. Connect the rear axle vent tube.
14. Install the tire and wheel assemblies.
15. Fill the axle with lubricant. Use the proper fluid.
16. Remove the utility stands and the jack stands.
17. Lower the vehicle.

Please let us know if you need anything else to get the problem fixed.

Here are instructions on how to change out the differential with a diagram below.

Raise the vehicle. Refer to Vehicle Lifting.
Place jack or utility stands (such as GMDE 123 B67313) at the front end of the vehicle.
Drain the axle lubricant from the rear axle.
Disconnect the propeller shaft.
Remove the tire and wheel assemblies.
Disconnect the parking brake cable.
Remove the brake line bracket bolts. Suspend the brake lines from the vehicle with heavy mechanics wire.
Remove the brake calipers from the brake caliper mounting brackets. Do not disconnect the brake lines. Suspend the calipers from the vehicle with heavy mechanics wire.
Disconnect the shock absorbers from the axle brackets.
Remove the vent hose from the rear axle vent fitting.
Remove the nuts and the washers from the U-bolts.
Remove the U-bolts, the spring plates and the spacers form the axle assembly.
Lower the axle assembly.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers

Tools Required

- J 22536 Pinion Driver

Removal Procedure

1. Raise the vehicle.
2. Remove the tire and wheel assemblies.
3. Remove the brake drums. Refer to Brake Drum Replacement See: Drum Brake System > Procedures.
4. Remove the axle shafts. Refer to Rear Axle Shaft Replacement See: Axle Shaft Assembly > Procedures.
5. Remove the differential. Refer to Differential Replacement See: Differential Assembly > Procedures.
6. Remove the drive pinion flange/yoke and the seal. Refer to Drive Pinion Flange/Yoke and/or Oil Seal Replacement See: Seals and Gaskets, Differential > Procedures.
7. Install the J 22536 as shown.

Ensure that the J 22536 is firmly seated on the pinion.

8. Drive the pinion out using the J 22536 and a hammer.

Strike the J 22536 slowly. Do not let the pinion fall out of the rear axle housing.
9. Remove the collapsible spacer from the pinion. Discard the spacer.
10. Remove the pinion bearings and the bearing cups. Refer to Drive Pinion Bearings Replacement See: Pinion Bearing, Differential > Procedures.
11. Remove the left handed threaded ring gear bolts. Discard the bolts.

Notice: Do not pry the ring gear from the differential case. Prying the ring gear from the differential case may cause damage to the ring gear and/or the differential case.

12. Remove the ring gear from the differential. Drive the gear off with a brass drift if necessary.

Installation Procedure
Important: The mating surface of the ring gear and the differential case must be clean and free of burrs before installing the ring gear.

1. Install the ring gear to the differential case.
Important: The ring gear bolts have left-hand threads.

2. Install the new ring gear bolts.

Hand start each bolt to ensure that the ring gear is properly installed to the differential case.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Tighten the new ring gear bolts. Tighten the ring gear bolts alternately and in stages, gradually pulling the ring gear onto the differential case.

Tighten
- For the 8.6 inch axle, tighten the ring gear bolts in sequence to 120 Nm (89 lb ft).
- For the 9.5 inch axle, tighten the ring gear bolts in sequence to 140 Nm (103 lb ft).

4. Install the pinion bearing cups. Refer to Drive Pinion Bearings Replacement See: Pinion Bearing, Differential > Procedures.
5. Determine the selective shim thickness for the pinion gear. Refer to Pinion Depth Adjustment See: Differential Assembly > Procedures.
6. Install the selective shim onto the pinion.
7. Install the inner pinion bearing to the pinion. Refer to Drive Pinion Bearings Replacement See: Pinion Bearing, Differential > Procedures.
8. Install a new collapsible spacer.
9. Lubricate the pinion bearings with axle lubricant. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication See: Fluid - Differential > Specifications.
10. Install the pinion to the axle housing.
11. Install the outer pinion bearing. Refer to Drive Pinion Bearings Replacement See: Pinion Bearing, Differential > Procedures.
12. Install a new pinion oil seal and the pinion yoke. Refer to Drive Pinion Flange/Yoke and/or Oil Seal Replacement See: Seals and Gaskets, Differential > Procedures.
13. Install the differential. Refer to Differential Replacement See: Differential Assembly > Procedures.
14. Perform a gear tooth contact pattern check on the pinion and the ring gear. Refer to Gear Tooth Contact Pattern Inspection See: Differential Assembly > Procedures.
15. Install the axle shafts. Refer to Rear Axle Shaft Replacement See: Axle Shaft Assembly > Procedures.
16. Install the brake drums. Refer to Brake Drum Replacement See: Drum Brake System > Procedures.
17. Install the tire and wheel assemblies.
18. Fill the axle with lubricant. Use the proper fluid. Refer to Approximate Fluid Capacities and Fluid and Lubricant Recommendations in Maintenance and Lubrication See: Fluid - Differential > Specifications.
19. Lower the vehicle.

This is for ring and pinion replacement, diff will be pretty much the same