GMC chevrolet camaro 2000 Service Manual page 76

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General Information
5. Rotate the propeller shaft 90 degrees and place
the inclinometer on the transmission output yoke
bearing cap. The bearing cap must be straight
up and down in order to obtain an accurate.
measurement.
6. Center the bubble in the sight glass.
7. Record the measurement.
8. Subtract the smaller reading from the larger
reading in order to obtain the front U-joint
working angle.
2 3
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The front angle is considered the odd U-joint because
this angle does not have another joint to provide
cancellation. The rear working angle
(6)
and the middle
working angle
(7)
act as a pair of U-joints in order to
cancel each other.out, as in the one-piece propeller
shaft systems. Because of this condition, keep
the working angle of the odd U-joint
(8)
at or under
1/2 of 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.
Vibration Diagnosis and Correction 0-65
Two-Piece Propeller Shaft Phasing
The setup and measurement techniques are identical
to that of.a the one-piece propeller shaft system.·
First, test for proper phasing, using the following
procedure:
1. Turn the rear propeller shaft so that the rear
U-joint is straight up and down. Verify thatthe
front U-joint of the rear propeller shaft is also
straight up and down.
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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-joint of the front propeller shaft are not in
this phase, the two halves of the propeller shaft ·
may have been assembled incorrectly.