Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
2.
Install selected shim on pinion shaft, lubricate rear pinion bearing with specified axle lubricant, then press rear bearing onto pinion using suitable
spacers.
3.
Install new collapsible spacer on pinion and insert pinion assembly into housing.
4.
Lubricate front pinion bearing, install bearing in housing and tap bearing onto pinion shaft while assistant holds pinion in place.
Old pinion nut
and large washer can be used to draw front bearing onto pinion, but care must be taken not to collapse spacer if this method is used.
5.
Install new pinion seal in housing, coat seal lips with grease, then mount driveshaft flange on pinion shaft, lightly tapping flange until several
pinion shaft threads protrude.
6.
Coat rear of pinion washer with suitable sealer, then install washer and new pinion nut and adjust preload to specifications.
PINION BEARING PRELOAD ADJUSTMENT
1.
Ensure that pinion and bearings are properly installed, as outlined.
2.
Hold driveshaft companion flange with suitable tool, then alternately tighten pinion nut and rotate pinion until endplay is reduced to zero.
3.
When endplay is reduced to zero, check pinion bearing preload by rotating pinion with suitable torque wrench.
4.
Continue tightening pinion nut in small increments until specified bearing preload is obtained, rotating pinion and checking preload after each
adjustment.
Exceeding preload specification will compress collapsible spacer too far, requiring replacement of spacer. If preload
specification is exceeded, spacer must be replaced and adjustment procedure must be repeated. Do not loosen pinion nut to reduce
preload.
12 1/4 Inch Ring Gear
DISASSEMBLY
1.
Clamp pinion drive flange in suitable vise.
2.
Remove cotter pin, nut, and washer from end of pinion.
3.
Remove drive flange and bearing retainer assembly from pinion.
4.
Drive oil seal from retainer and discard seal.
5.
Remove pinion rear bearing snap ring, then, using tool J-1453 or equivalent, press bearing from pinion.
6.
Position drive pinion in arbor press so that bearing is supported by two pieces of flat steel stock placed parallel to each other and against pinion so
as to contact large area of bearing outer race.
7.
Press pinion from bearing, ensuring that pinion is supported.
INSPECTION
1.
Wash all parts in suitable solvent.
2.
Inspect pinion for scored, cracked, chipped, or worn teeth.
3.
Inspect splines on pinion shaft for excessive wear.
4.
Inspect pinion bearing assemblies for roughness, defects, or excessive wear.
ASSEMBLY
1.
Pack cavity between pinion oil seal lips with suitable lubricant.
2.
Using tool J-22281 or equivalent, press oil seal into retainer with seal lips facing pinion bearing.
3.
Install pinion rear bearing assembly on pinion shaft, ensuring that chamfered side of inner race seats against shoulder on pinion shaft, then, using
tool J-1364 or equivalent, install pinion bearing lock ring.
4.
Position pinion front bearing on pinion shaft so that extended portion of inner race faces pinion head, then, using suitable length of two inch pipe,
press bearing onto shaft until bearing seats against pinion head.
When pressing bearing onto pinion, be careful not to damage ground surface
of pilot.
5.
Slide oil seal retainer onto pinion shaft, then tap drive flange onto pinion splines.
6.
Clamp drive flange in suitable vise and install flange washer and nut, torquing nut to 220 ft. lbs., then install cotter pin without backing off nut.
