Driveshaft Inspection

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

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.

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.
NOTE: Do not make any adjustments before carrying out a road test. Do not change the tire pressure or the vehicle load.
With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to JACKING & LIFTING .
- The driveshaft 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 jackstands.
Inspect the driveshaft for damage, undercoating or incorrectly seated U-joints. Rotate the driveshaft slowly by hand and feel for binding or end play in the U-joint trunnions. Remove the driveshaft. For additional information, refer to REMOVAL AND INSTALLATION . Inspect the slip yoke splines for any galling, dirt, rust or incorrect lubrication. Clean the driveshaft or install new U-joints as necessary. Install a new driveshaft 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 driveshaft passes visual inspection, measure the driveshaft runout.