Sealers, Adhesives, and Lubricants
| Application | Type of Material | GM Part Number | |
|---|---|---|---|
| United States | Canada | ||
| Transfer Case Lubricant | Hypoid Gear Oil | 12378261 | 10953455 |
Sealers, Adhesives, and Lubricants
Intermittent
Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.
Noisy in Drive
| Cause | Correction |
|---|---|
| Inspect for the proper transaxle and gear oil levels prior to performing system diagnosis. Refer to Transfer Case Fluid Drain and Fill . | |
| Loose propeller shaft mounting bolts | Tighten the bolts, as required. Refer to Propeller Shaft Replacement . |
| Worn propeller shaft constant velocity and/or universal joints | Replace components, as required. Refer to Propeller Shaft Replacement . |
| Worn or loose propeller shaft center support bearing | Replace components, as required. Refer to Propeller Shaft Replacement . |
| Worn axle shaft constant velocity joints | Replace the constant velocity joints, as required. |
| Loose rear differential mounts or worn bushings | Tighten the mount bolts or replace, as required. |
| Incorrect oil in the transfer case | Replace the oil with GM P/N 12378261 (Canadian P/N 10953455). |
| Bearing noise within the transfer case A grinding or roar type noise will increase or decrease relative to the vehicle speed. | Inspect for the proper fluid level and fill, as required. If the noise continues, repair or replace the transfer case, as required. |
| Gear set whine noise within the transfer case Whine type noises will increase or decrease relative to the vehicle speed. | Inspect for the proper fluid level and fill, as required. If the noise continues, replace the transfer case, as required. Contributing factors may include: Incorrect backlash between the gear set Worn or damaged gear teeth Transaxle assembly noise Differential noise |
Noisy in Drive
Noisy When Coasting
| Cause | Correction |
|---|---|
| Inspect for the proper transaxle and gear oil levels prior to performing system diagnosis. Refer to Transfer Case Fluid Drain and Fill . | |
| Loose propeller shaft mounting bolts | Tighten the bolts, as required. Refer to Propeller Shaft Replacement . |
| Worn propeller shaft universal joints | Replace components, as required. Refer to Propeller Shaft Replacement . |
| Worn or loose propeller shaft center support bearing | Replace components, as required. Refer to Propeller Shaft Replacement . |
| Worn axle shaft constant velocity joints | Replace the constant velocity joints, as required. |
| Loose rear differential mounts or worn bushings | Tighten the mount bolts or replace, as required. |
| Incorrect oil in the transfer case | Replace the oil with GM P/N 12378261 (Canadian P/N 10953455). |
| Bearing noise within the transfer case A grinding or roar type noise will increase or decrease relative to the vehicle speed. | Inspect for the proper fluid level and fill, as required. If the noise continues, replace the transfer case, as required. |
| Gear set whine noise within the transfer case Whine type noises will increase or decrease relative to the vehicle speed. | Inspect for the proper fluid level and fill, as required. If the noise continues, replace the transfer case, as required. Contributing factors may include: Incorrect backlash between the gear set Worn or damaged gear teeth Transaxle assembly noise Differential noise |
Noisy When Coasting
Tools Required
J 44873 Pinion Flange Holder and Remover
- Remove the ventilation valve (408), hose (407) and clamps (406).
- Remove the drain plug (403) and washer (404).
- Remove the fill plug (401) and washer (402).
- Remove the bolts (102) and cover (101).
- Remove the seal (305) and O-ring (304).
- Remove the locating pin (105).
- Remove the input gear (214).
- Remove the bearing (217) and 25 mm shim (216).
- Mark or tag the shim (216) for assembly.
- Secure the case in a vise with soft jaws.
- Using a chisel, cut the locking tab on the locknut (210).
- Install the J 44873 and bolts to the output yoke. Tighten: Tighten the bolts to 48 N.m (35 lb ft).
- Loosen the locknut.
- Remove the J 44873 and bolts.
- Remove the nut (210), washer (209), sealing washer (303), O-ring (302), and output yoke (208). Note the washer (209) installed position.
- Remove the output shaft (201) with bearing, collapsible spacer (204) and washers (215).
- Remove the seal (301) and bearing (207).
SA9179NE Dial Indicator
- Use the SA9179NE in order to measure the output shaft/input gear backlash. Specification: 0.06-0.16 mm (0.0024-0.0063 in)
- Secure the case in a bench vise with soft jaws.
- Measure the output shaft/input gear rotating torque. Specification: 3.20-4.16 mm (28.2-34.3 lb in)
- If the measurements are not within specifications, replace the transfer case as required.