Chrysler 2005 Crossfire SRT6 Service Manual page 157

ZH
Worn or damaged differential bearings usually produce a low pitch noise. Differential bearing noise is similar to
pinion bearing noise. The pitch of differential bearing noise is also constant and varies only with vehicle speed.
Rear wheel hub bearings produce noise and vibration when worn or damaged. The noise generally changes when
the bearings are loaded. Road test the vehicle. Turn the vehicle sharply to the left and to the right. This will load the
bearings and change the noise level. Where bearing damage is slight, the noise is usually not noticeable at speeds
above 30 mph.
LOW SPEED KNOCK
Low speed knock is generally caused by worn universal joints. A worn pinion shaft bore will also cause a low speed
knock.
VIBRATION
Vibration at the rear of the vehicle is usually caused by a:
• Damaged propeller shaft.
• Missing propeller shaft balance weight(s).
• Worn or out-of-balance wheels.
• Loose wheel studs.
• Worn U-joint(s).
• Damaged rear wheel hub bearings.
• Loose pinion gear nut.
• Excessive pinion yoke run out.
• Damaged halfshafts.
Check for loose or damaged front-end components or engine/transmission mounts. These components can contrib-
ute to what appears to be a rear end vibration. Do not overlook engine accessories, brackets and drive belts.
All driveline components should be examined before starting any repair.
DRIVELINE SNAP
A snap or clunk noise when the vehicle is shifted into gear (or the clutch engaged), can be caused by:
• High engine idle speed.
• Transmission shift operation.
• Loose engine/transmission.
• Worn U-joints.
• Loose pinion gear nut and yoke.
• Excessive ring gear backlash.
• Excessive side gear to case clearance.
• Damaged halfshafts.
The source of a snap or a clunk noise can be determined with the assistance of a helper. Raise and support the
vehicle on a hoist with the wheels free to rotate. Instruct the helper to shift the transmission into gear. Listen for the
noise, a mechanics stethoscope is helpful in isolating the source of a noise.
REAR DIFFERENTIAL 3 - 41