GMC 1990 Light Truck Repair Manual page 195

Figure 24—Pinion Height Block
DANA REAR AXLES 4B5-9
Figure 27—Measuring the Shims
8
. Record the reading at the point of greatest
deflection (when the dial indicator needle is
centered between movement to the left and to the
right).
• This reading indicates the amount of shims
needed for a nominal pinion setting. The
pinion marking may change the pinion depth
by adding or deleting shims from the nominal
pinion setting.
• A positive ( + ) pinion marking indicates that the
distance between the ring gear centerline and the
pinion head must increase by the number of
thousandths marked on the pinion. This means that
the shim pack will decrease by the same number of
thousandths.
• A negative (-) pinion marking indicates that the
distance between the ring gear centerline and the
pinion head must decrease by the number of
thousandths marked on the pinion. This means that
the shim pack will increase by the same number of
thousandths.
• A pinion etched zero (0) will use the nominal setting
as determined in this procedure.
9. Measure each shim separately with a micrometer
and add them together to obtain the total shim pack
thickness. If a baffle (5) or slinger is used, these
must also be measured and included in the shim
pack (figure 27).
PINION INSTALLATION
+ + Install or Connect
Tools Required:
J 7818 Front Pinion Bearing Cup Installer
J 5590 Rear Pinion Bearing Cone Installer
D-111 Cup Installer (Miller)
C-4171 Handle (Miller)
J 8092 Handle
J 8614-01 Pinion Flange Remover
1, Place the required amount of shims (and baffle if
used) in the inner bearing bore.