Symptom Chart: NVH

SYMPTOM CHART

Condition	Possible Sources	Actions
Driveline clunk - loud clunk when shifting from REVERSE to DRIVE	Damaged or worn Constant Velocity (CV) joints	INSPECT the Constant Velocity (CV) joints for wear or damage. INSTALL a new driveshaft as necessary. REFER to: REAR DRIVESHAFT .
	Damaged driveshaft center bearing support	INSPECT the insulator for wear or damage. INSTALL a new driveshaft as necessary. REFER to: REAR DRIVESHAFT .
Driveline clunk - occurs as the vehicle starts to move forward following a stop	Worn driveshaft CV joint with excessive play	INSPECT the CV joint for a worn condition. INSTALL a new driveshaft if necessary. REFER to: REAR DRIVESHAFT .
	Damaged driveshaft center bearing support	INSPECT the insulator for wear or damage. INSTALL a new driveshaft as necessary. REFER to: REAR DRIVESHAFT .
Buzz - buzzing noise is the same at cruise or coast/deceleration	Incorrect driveline angles	CHECK for correct driveline angles. REPAIR as necessary.
Rumble or Boom - noise occurs at coast/deceleration, usually driveshaft speed-related and noticeable over a wide range of speeds	Driveshaft out of balance	CHECK the driveshaft for damage, missing weights or undercoating. INSTALL a new driveshaft as necessary. REFER to: REAR DRIVESHAFT .
Grunting - normally associated with a shudder experienced during acceleration from a complete stop	Driveshaft CV joint binding	INSTALL a new driveshaft as necessary. REFER to: REAR DRIVESHAFT .
Driveline shudder - occurs during acceleration from a slow speed or stop	Driveline angles out of specification	CHECK for correct driveline angles.
	Binding or damaged driveshaft CV joint	INSPECT the driveshaft CV joints and coupling shaft for wear or damage. INSTALL a new driveshaft as necessary. REFER to: REAR DRIVESHAFT .
Driveline vibration - occurs at cruising speeds	Worn or damaged driveshaft center bearing support	CHECK the insulator for damage or wear. ROTATE the driveshaft and CHECK for rough operation. INSTALL a new driveshaft as necessary. REFER to: REAR DRIVESHAFT .
	Loose axle pinion flange bolts	INSPECT the axle pinion flange. TIGHTEN the pinion flange bolts to specification. REFER to: REAR DRIVESHAFT .
	Excessive axle pinion flange runout	CARRY OUT a runout check. REPAIR as necessary.
	Driveshaft is out of balance	CHECK the driveshaft for damage, missing balance weights or undercoating. CHECK the driveshaft balance. CARRY OUT a driveline vibration test.
	Binding or damaged driveshaft CV joint	INSPECT the driveshaft CV joint for wear or damage. INSTALL a new driveshaft as necessary. REFER to: REAR DRIVESHAFT .
	Excessive driveshaft runout	CARRY OUT a runout check.
	Driveline angles out of specification	CHECK for correct driveline angles. REPAIR as necessary.