Axle and Driveshaft—Service

Rear axle concerns can be diagnosed and corrected quickly if the proper procedure is followed. Being able to perform a good diagnosis is not just handy, but necessary to eliminate guesswork and save time.

This Section defines various possible rear axle conditions and tests for identifying the cause, and the service procedure. The four rear axle conditions that will be reviewed are:

Leakage Conditions:

• Drive Pinion Seal
• Pinion Nut
• Axle Shaft Seals
• Casting Porosity
• Weld Leaks
• Axle Vent

Vibration Conditions:

• Tires
• Driveline Angle
• Axle Shaft Runout
• Circular Companion Flange Runout

Noise Conditions:

Non-Axle Noise

Axle Noise

• Gear Noise
• Knock
• Clunk
• Bearing Noise
• Bearing Preload Check
• Bent Axle Housing—Analysis
• Axle Alignment Inspection—Rear

Inoperative Conditions:

• Broken Axle Shaft
• Broken Pinion Stem
• Broken Welds
• Wheel Bearing Malfunctions
• Axle Lockup

The diagnostic material also deals with concern analysis; that is, uncovering the original cause of a concern so that repeat service can be avoided. However, the purpose of this Section is to provide information on service steps of special importance.