GMC Chevrolet Camaro 1998 Service Manual page 93

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General Information
If the complaint is present only with cargo in the
vehicle, perform the measurements with the vehicle
fully loaded. Once a second-order driveline vibration
has been corrected with the vehicle loaded, .the ·
vibration may reappear with the vehicle unloaded. The
reverse of this is also true. You may .have to reach
a compromise with the customer in this case.
Driveline Working Angles
Tools Required
• J 23498-A Driveshcl,ft Inclinometer
• J 23498-20 Driveshaft Inclinometer Adapter
(Offset)
Driveline working angle does not refer to the angle of
any one shaft, but to the angle that is formed by
the intersection of two shafts, as shown.
The procedure for measuring and correcting driveline
working angles depends on whether the vehicle is
equipped with a one or two-piece propeller shaft.
You need a J 38460
• The J 23498-A
• The J 38460
• Use J 23498-20
To verify the accuracy ofthe adapter, check the angle
of an angle of an accessible joint with the inclinometer
prior to assign it on an inaccessible joint.
Preliminary Checks
Raise the vehicle on a suitable hoist or on safety
stands. Ensure that the rear axle is supported at curb
height and that the wheels are free to spin. Refer
to Lifting and Jacking the Vehicle in General
Information. Place the transmission in Neutral. Make
sure the vehicle has a full tank of fuel or the equh,:alent
amount of weight in the rear to simulate a full tank.
3.8 liters of gasoline (one gallon) weighs approximately
2.8
kg
(6.2
lb).
Checking Phasing of U-joints
Inspect the propeller shaft for correct phasing. This
means that the front and rear U-joints are directly
in line or parallel with each other so that proper
cancellation takes place.
1 . Rotate the propeller shaft so that the propeller
shaft rear U-joint bearing cap (1) is vertical
as shown.
Vibration Diagnosis and Correction 0-81
182316