GMC Chevrolet Camaro 1998 Service Manual page 96

0-84 Vibration Diagnosis and Correction
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182339
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182343
General Information
This system has an odd joint that does not have
another joint to provide cancellation. Therefore, the
rear working angle and the middle working angle
act as a pair of joints to cancel each other out, like in
one-piece propeller shaft systems. (
The front angle is considered the odd joint because it
does not have another joint to provide cancellation.
Because of this, the working angle of the odd
joint must be kept at or under 1/2 or a degree.
Keep the working angle of this odd joint to a minimum
so that there are not any great fluctuations in speed
that need to be canceled out. The front joint is used as
the odd joint because the front joint angle does not
change with suspension bounce, rebound, or axle
windup. For this reason, think of the front propeller
shaft of a two piece system as an extension of
the transmission output shaft.
Two-Piece Propeller Shaft Phasing
The setup and measurement techniques are identical
to that of a one-piece propeller shaft system. First,
check for proper phasing:
1. Turn the rear shaft so the rear U-joint is straight
up and down. Ensure that the front U-joint of the
rear propeller shaft is also straight up and down.
2. Rotate the shafts 90 degrees so that the front
propeller shaft front U-joint is straight up and
down. Ensure that the front propeller shaft is also
straight up and down (actually part of the slip
yoke on the rear shaft).
If the two U-joints of the front propeller shaft are not in
this phase, the two halves of the propeller shaft may
have been assembled incorrectly.
Two-Piece Propeller Shaft Lateral Alignment
The procedure for lateral alignment of a two-piece
propeller shaft is used for launch shudder or any
second-order, driveline vibrations. Adjust the lateral
alignment before you measure and adjust the driveline
angles.
1. Raise and suitably support the vehicle on a hoist.
Refer to Lifting and Jacking the Vehicle
2. Look down the front of the propeller shaft.
3. If the propeller shaft is not straight, or if the center
bearing support is off to one side, relocate center
support bearing to make the propeller shaft
assembly as straight as possible. Ensure that you
do not create a ground-out condition against
the exhaust or another component.
(