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 REPLACEMENT . | |
| Water or contamination within the lubricant Water or contamination within the lubricant, causing excessive torque converter clutch slip rate, may create a grind, growl, or moan in the rear differential or torque tube under light or steady load conditions. | Replace the lubricant and flush the transfer case of the contaminated fluid. Refer to Internal Components Cleaning and Inspection. |
| Loose propeller shaft mounting bolts | Tighten the bolts, as required. Refer to FASTENER TIGHTENING SPECIFICATIONS - PROPELLER SHAFT . |
| Worn propeller shaft constant velocity joints | Replace propeller shaft assembly. Refer to PROPELLER SHAFT REPLACEMENT . |
| Worn axle shaft constant velocity joints | Replace the constant velocity joints, as required. |
| Loose rear axle torque tube bracket or a worn bracket bushing | Tighten the bracket bolts or replace the bracket, as required. |
| Worn bearing in the rear differential torque tube assembly | Replace the torque tube assembly. |
| Torque tube dampener loose or missing A moan or exhaust leak type noise at higher engine speeds, approximately 2,000-2,500 RPM, may indicate a loose or missing dampener. | Tighten the dampener retaining bolt or replace the torque tube assembly, as required. |
| Incorrect gear oil in the transfer case | Replace the gear oil. Refer to SEALERS, ADHESIVES, AND LUBRICANTS . |
| 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. Fill, as required. If the noise continues, repair or replace the internal components, 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. Fill, as required. If the noise continues, repair or replace the internal components, as required. Contributing factors may include: Incorrect backlash between the gear sets Worn or damaged gear teeth Transaxle assembly noise Rear differential noise |
CAUSES - 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 REPLACEMENT . | |
| Loose propeller shaft mounting bolts | Tighten the bolts, as required. Refer to FASTENER TIGHTENING SPECIFICATIONS - PROPELLER SHAFT . |
| Worn propeller shaft constant velocity joints | Replace the propeller shaft assembly. Refer to PROPELLER SHAFT REPLACEMENT . |
| Worn axle shaft constant velocity joints | Replace the constant velocity joints, as required. |
| Loose rear differential torque tube bracket or a damaged bracket bushing | Tighten the bracket bolts or replace the bracket, as required. |
| Worn bearing in the rear axle torque tube assembly | Replace the torque tube assembly. |
| Incorrect gear oil in the transfer case | Replace the gear oil. Refer to SEALERS, ADHESIVES, AND LUBRICANTS . |
| 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. Fill, as required. If the noise continues, repair or replace the internal components, 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. Fill, as required. If the noise continues, repair or replace the internal components, as required. Contributing factors may include: Incorrect backlash between the gear sets Worn or damaged gear teeth Transaxle assembly noise Rear differential noise |
CAUSES - NOISY WHEN COASTING
Sealers, Adhesives, and Lubricants
| Application | Type of Material | GM Part Number | |
|---|---|---|---|
| United States | Canada | ||
| Transfer Case Fill | Synthetic Lubricant | 89021677 | 89021678 |
SEALERS, ADHESIVES, AND LUBRICANTS SPECIFICATIONS