Drive/Propeller Shafts, Bearings and Joints: Testing and Inspection

PROPELLER SHAFT INSPECTION AND VERIFICATION

Note:
^ Driveline vibration exhibits a higher frequency and lower amplitude than high-speed shake. Driveline vibration is directly related to the speed of the vehicle and is noticed at various speeds. Driveline vibration can be perceived as a tremor in the floorpan or heard as a rumble, hum or boom.

Note:
^ Refer to Specifications for all runout specifications.

Note:
^ Do not make any adjustments before carrying out a road test. Do not change the tire pressure or the vehicle load.

1. Carry out a visual inspection of the vehicle. Operate the vehicle and verify the condition by reproducing it during the road test.
- The concern should be directly related to vehicle road speed, not affected by acceleration or deceleration, or could not be reduced by coasting in neutral.
2. With the vehicle in neutral, position it on a hoist.
- The propeller shaft should be kept at an angle equal to or close to the curb weighted position. Use a twin-post hoist or a frame hoist with jack-stands.
3. Inspect the propeller shaft for damage, undercoating or incorrectly seated U-joints. Rotate the propeller shaft slowly by hand and feel for binding or end play in the U-joint trunnions. Remove and inspect the slip yoke splines for any galling, dirt, rust or incorrect lubrication. Clean the propeller shaft or install new U-joints as necessary. Install a new propeller shaft if damaged. After any corrections or new components are installed, recheck for the vibration at the road test speed.
- If the vibration is gone, test drive the vehicle.
- If the vibration persists or the propeller shaft passes visual inspection, measure the propeller shaft runout.