Pinion Installation - GMC T Series 1994 Repair Manual

13. At the point of greatest deflection, set the dial indi­
cator to zero. Repeat the rocking action of the
gauge shaft to verify the zero setting.
14. Rotate the gauge shaft until the dial indicator rod
does not touch the gauge block.
15. Record the actual number on the dial indicator and
not the number which represents how far the nee­
dle travels. This is the nominal pinion setting.
EXAMPLE: The indicator needle moved counter
clockwise 1.70 mm (0.067 inch) to a dial reading of
0.84 mm (0.033 inch) (figure 14). Record the dial
A. Dial indicator and arbor positioned on the gage block.
B. Measurement after the arbor is moved o ff of the gage block,
reading of 0.84 mm (0.033 inch), NOT 1.70 mm
(0.067 inch).
16. Check the pinion face for a pinion adjustment
mark. This mark indicates the best running position
for the pinion from the nominal setting.
• If the pinion has no plus or minus marked on it,
use the nominal pinion setting to select a shim.
17. Remove bearing caps (10) and depth gauging
tools.
18. Install the correct pinion shim (6) to the pinion
according to this procedure.
NOTICE: Proper pinion depth setting is a
two-step procedure.
1. Setup dimension arrived at with the
indicator to be considered a starting
point.
2. Gear tooth pattern check is necessary
to "fine tune" the pinion depth and may
indicate additional shim changes to the
pinion stem. Both procedures must be
performed to ensure proper axle perfor­
mance and prevent system damage.
PINIO N INSTALLATION
■ ► 4 - Install or Connect (Figures 1, 15, and 16)
Tools Required:
J 8609-01 Rear Pinion Bearing Cone Installer
J 22388 Pinion Oil Seal Installer
J 8614-01 Pinion Flange Remover
J 5590 Rear Pinion Bearing Cone Installer
i .
F4682