GMC Chevrolet Camaro 1998 Service Manual page 88

0-76 Vibration Diagnosis and Correction
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General Information
Troubleshooting Hints
Vibration is eliminated with the correction of the
propeller shaft runout. If some vibration is still present,
perform a vehicle road test. Then, determine if an
on-vehicle system balance is necessary.
Driveline System Balance with Electronic
Vibration Analyzer (EVA)
To pinpoint the source, you must reproduce the
vibration in the service stall and then determine which
component is vibrating the most using the EV
A:
1 . Support the vehicle on a suitable hoist or on safety
stands. Ensure that the rear of the rear axle is at
curb height. Do not allow the axle to hang.
Refer to Lifting and Jacking the Vehicle in General
Information.
2. Remove the rear tire/wheel assemblies. Refer to
Wheel Removal in Tires and Wheels.
3. Remove the brake drums. Refer to Brakes.
4. Ensure that the propeller shaft is free of
undercoating. Check for dents or damage to the
propeller shaft or U-joints.
Caution: Refer to Running a Vehicle on Hoist
Caution in Cautions and Notices.
5. Start the engine. Place the transmission in gear
and run at the vehicle speed at which the
vibration occurs at.
Determine which end of the propeller shaft is vibrating
the most. Hold the EV A's sensor against the pinion
nose and the transmission tailshaft assembly.
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The higher the amplitude reading, the greater the
vibration.
If the vehicle has a two-piece propeller shaft, check
the center support bearing.
If the transmission tailshaft vibrates, check the
transmission crossmember under the transmission
mount. The vibration should not be present if the
mount is doing its job.
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