GMC Chevrolet Camaro 1998 Service Manual page 92

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Vibration Diagnosis and Correction General Information
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If the vibration does not change at all, or gets worse,
then one clamp is too light or too heavy.
• If the vibration did not change at all, then repeat
the procedure using two clamps together.
• If the vibration got worse, repeat the procedure
using two clamps separated. Separate the
clamps to reduce the spinning weight.
Continue the trial and error procedure using different
weights in different locations until you achieve the best
balance. If more that three clamps aligned in the
same position are required, then replace the
propeller shaft.
If you are able to reduce the vibration in the stall, but
are unable to eliminate the vibration completely,
perform a road test on the vehicle. A slight vibration
noticeable in the stall may not be noticeable
on the road.
Propeller Shaft Balance Weights
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When using clamps in order to balance a propeller
shaft with the total wight method, the correction weight
required will often be a fraction or a multiple of one
hose clamp. Use the following phasing procedure with
two hose clamp in order to accurately place any
required amount between zero weights (0.0 total
weight) to two weights (2.0 total weight).
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Ensure that the clamps are located with even spaces
on either side of the light spot, or 180 degrees
opposite the heavy spot.
The following table contains the weight amounts in
terms of the total weight and the included angle
(spread) between the clamps. Refer to Propeller Shaft
Runout Specifications
The main objective of this section is to correct the
conditions that interfere with the proper cancellation
effect of the U-joints. The most common condition,
especially where the where launch shudder is
concerned, is incorrect driveline working angles.
However, other factors may aggravate the condition.
Address these factors before you attempt to measure
or correct driveline working angles:
• Worn, failed, damaged, or improperly installed
U-joints
• Worn, collapsed, or improper powertrain mounts
• Incorrect vehicle trim height adjustment for
the front suspension. This condition aggravates
launch shudder.
• Incorrect trim height adjustment for the rear
suspension.
• Trim height inspection includes trim heights that
are too low or too high. Vehicles equipped with
aftermarket lift kits, vehicles that are constantly
loaded with cargo, and custom conversion vans all
fit
in this category. On rear drive vehicles, the
pinion nose tilts upward as the rear trim height is
lowered.
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If a second-order driveline vibration exists after these (
conditions are corrected, measure and correct the
driveline angles.