GMC 1986 P-Truck Service Manual page 380

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A. Check Front Runout
B. Check Center Runout
C. Check Rear Runout
D. Check Splined Shaft Runout At Tapered Hole In Splined End
E. Check Front Runout
1. One Piece Propeller Shaft Or Rear Propeller Shaft In A Two-Piece Driveline
2. Front Propeller Shaft In A Two-Piece Driveline
PROPELLER FRONT
SHAFT
CHECK
ONE PIECE 0.040
TWO PIECE
0.020
FRONT
TWO PIECE
0.030*
REAR
ANOTE: This measurement must be taken at
the tapered hole on the splined shaft after the
rear propeller shaft is removed.
* NOTE: This measurement must be taken
with the rear propeller shaft mounted on the
front shaft which is w ithin specifications.
Figure 6—Propeller Shaft Runout Specifications
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2 d
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Figure 5—Checking Propeller Shaft Runout
CENTER REAR
CHECK CHECK
0.055
0.050
0.008A
0.030 0.035
B-07557
PROPELLER SHAFT 4A-7
JL
B
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having a two-piece driveline, measure the rear
propeller shaft runout (figure 5). Reference mark
the position of the rear propeller shaft yoke to the
pinion flange, then remove the rear propeller
shaft and measure the front propeller shaft
runout on the tube and at the tapered hole on the
splined shaft end (figure 5). If the runout exceeds
specification, rotate the propeller shaft 180
degrees at the companion flange and install.
Check the runout.
5. If the runout is still over specification at one or
more check points, replace the propeller shaft
after checking for vibration or noise. Check the
runout on the replacement propeller shaft.
. If the new p ro p e lle r sh aft runout is over
6
specification, check for a bent companion flange.
Im portant
• The splined end of the front propeller shaft
is critical to the smooth operation of a
tw o-piece d riv e lin e . Be sure the dial
indicator readings are accurate.
B-07556