GMC 1989 Light Duty Truck Repair Manual page 197

DANA REAR AXLES 4B5-9
8. R ecord the re a d in g at th e p o in t of g re a te s t
d e fle c tio n (when the dia l in d ic a to r nee dle is
centered between movement to the left and to the
right).
• This reading indicates the amount of shims
needed for a nom inal 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
p inion head m ust increase by the n um ber of
thousandths marked on the pinion. This means that
the shim pack will decrease by the same num ber of
thousandths.
• A negative (-) pinion marking indicates that the
distance between the ring gear centerline and the
pinion head m ust decrease by the num ber 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 C onnect
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.