Copied and pasted from Factory Service Manual:
REMOVAL AND REPLACEMENT OF DRIVE
PINION FLANGE AND OIL SEAL IN VEHICLE
On large stem carriers which use the collapsible
spacer to obtain pinion bearing preload, the following
procedure for the removal and replacement of the
drive pinion flange and pinion oil seal must be followed
to assure that the proper bearing preload is
maintained in the axle assembly. If this procedure is
not followed it could result in a premature failure of
the axle.
(1) Raise vehicle on hoist and make scribe marks
on propeller shaft, shaft universal joint, drive pinion
flange and end of pinion stem.
(2) Disconnect propeller shaft at pinion flange and
secure in an upright position to prevent damage to
front universal joint.
(3) Remove the rear wheels and brake drums to
prevent any drag or a possible false preload reading
could occur.
(4) Using inch-pound torque wrench C-685-A measure
pinion bearing preload by rotating pinion with
handle of wrench floating, read the torque while
wrench is moving through several complete revolutions
and record. This operation is very important
because preload must be carefully reset when reassembling.
(5) With Tool C-3281 hold companion flange and
remove drive pinion nut and Belleville washer.
(6) Install companion flange remover Tool C-452
and remove flange. Lower rear of vehicle to prevent
lubricant leakage.
(7) Using a screwdriver and hammer, remove the
pinion oil seal from the carrier and clean the oil seal
seat.
(8) Check splines on pinion shaft stem to be sure
they are free of burrs or are not worn badly. If burrs
are evident remove them using crocus cloth by working
in a rotational motion. Wipe the pinion shaft
clean.
(9) Inspect companion flange for cracks, worn
splines, pitted, rough or corroded oil seal contacting
surface. Repair or replace companion flange as necessary.
(10) Apply a light coat of sealer in seal bore of
carrier and install drive pinion oil seal into carrier
using Tool C-4109 or C-3980 (Double lip synthetic
rubber oil seal) or Tool C-3656 (single lip leather oil
seal). The proper tool must be used in order to prop-
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3-44 REAR AXLE
erly position the seal the correct depth into the carrier
casting.
(11) Position companion flange on pinion stem
being careful to match scribe marks made previously
before removal.
(12) Install companion flange with installing Tool
C-496 or DD-999 and holding Tool C-3281.
(13) Remove tool and install Belleville washer
(convex side of washer out) and pinion nut.
(14) Hold universal joint flange with holding Tool
C-3281 and tighten pinion nut to 210 foot-pounds.
Rotate pinion several complete revolutions to assure
that bearing rollers are properly seated. Using an
inch-pound torque wrench C-685-A measure pinion
bearing preload. Continue tightening pinion nut and
checking preload until preload is at the original established
setting you found in step 4. Under no circumstances
should the preload be more than 5 inchpounds
over the established setting found at time of
checking in step 4 of procedure.
Bearing preload should be uniform during a complete
revolution. A preload reading that varies during
rotation indicates a binding condition which has to be
corrected. The assembly is unacceptable if final pinion
nut torque is below 210 foot-pounds or pinion bearing
preload is not within the correct specifications.
CAUTION: Never back off the pinion nut to lessen
pinion bearing preload. If the desired preload is exceeded
a new collapsible spacer must be installed and
nut retightened until proper preload is obtained. In
addition, the universal joint flange must never be
hammered on, or power tools used.
(15) Install propeller shaft (match scribe marks
on propeller shaft universal joint and pinion flange).
Tighten clamp screws to 15 foot-pounds.
(16) Install the rear brake drums and wheels and
tighten nuts 65 foot-pounds.
(17) Raise the vehicle to a level position so axle
assembly is at correct running position and check
lubricant level.
