Inspect for proper gear oil levels prior to performing system diagnosis.

Loose propeller shaft mounting bolts

Tighten the bolts as required. Refer to Fastener Tightening Specifications .

Worn propeller shaft constant velocity joint

Replace the propeller shaft assembly. Refer to Propeller Shaft Replacement .

A worn propeller shaft constant velocity joint may create a clicking, grinding, or snapping type noise.

Worn or loose center bearing assembly

Replace the center bearing assembly as required. A worn center bearing may cause vehicle vibration or a grinding, squealing type of noise. Refer to Center Bearing Removal .

Worn universal joints

Replace the universal joints as required. A worn universal joint may create a clicking or snapping type of noise. Refer to Universal Joint Replacement - External Snap Ring .

Worn axle shaft constant velocity joints

Replace/repair the constant velocity joints as required. A worn axle shaft constant velocity joint may create a clicking, grinding, or snapping type of noise.

Refer to Symptoms - Rear Drive Axle .

Transfer case noise

Refer to Diagnostic Starting Point - Transfer Case for the MJ8 transfer case and Diagnostic Starting Point - Transfer Case for the NVG900 transfer case.

Worn or damaged axle mounting bushings (side)

Replace bushings as required.

A worn bushing may create a clunk type of noise during acceleration or deceleration. Refer to Differential Housing Support Bushing Replacement .

Worn or damaged axle mounting bushing (rear)

Replace bushings as required.

A worn bushing may create a clunk type of noise during acceleration or deceleration.

Check bushing orientation; the tuning slots must be in proper position.

Loose rear mounting bracket

Tighten the bracket bolts as required. Refer to Fastener Tightening Specifications .

Loose or damaged prop guard

Repair or replace as required.

A loose dust shield may contact the propeller shaft assembly and create a scraping or grinding type of noise.

Bearing noise within axle assembly

A grinding roar type of noise will increase or decrease relative to the vehicle speed.

1. Check for proper fluid level. Refer to Rear Axle Lubricant Replacement .
2. If the noise continues, repair or replace the unit as required.

Gear set whine noise within axle assembly

A whine type of noise will increase or decrease relative to the vehicle speed (approximately 80-90 km/h (50-56 mph)).

1. Check for the proper fluid level. Refer to Rear Axle Lubricant Replacement .
2. Repair or replace the unit as required.

Shutter or moan at slow speeds or slow turns

A shutter or moan type of noise in slow sharp turns.

1. RDM could be contaminated with the wrong fluid type/water.
2. Replace the fluid; fill as required and retest under conditions. Refer to Rear Axle Lubricant Replacement .
3. Replace the drum.