GMC 1989 Light Duty Truck Repair Manual page 182

10
4B4-6 1 / 2-INCH RING GEAR
2. O u te r pinion b earin g cup (6) using J 8 6 0 8 and
J 80 92 .
3. inn er pinion bearing cup (13) using J 2 4 4 3 2 and
J 80 92 .
4. A new collapsible sp acer (12) to the pinion.
5. Pinion (14) into the pinion g ag e (10).
6
. Pinion outer b earing (6) onto the pinion.
• Press the bearing onto the pinion.
7. Pinion oil seal (5) using J 2 4 4 3 4 and J 80 9 2 .
8
. Pinion flan ge oil d eflector (4) and pinion flan ge (3) to
the pinion splines.
9. W ash er (2) and a new pinion nut (1).
• P lac e th e pinion ca g e assem b ly into the vice.
10. F lang e holder J 8614-01 to the pinion flange.
T ig h te n (Figure 11)
• T h e nut until the pinion end play is just taken
up. R otate the pinion w hile tightening in order
to seat th e bearings. O n c e th ere is no end play
in the pinion, the preload torque should be
checked.
• R e m o v e J 8 6 1 4 -0 1 .
torque w ren ch, ch eck the pinion preload by
rotating the pinion with the w rench. Preload
should be at or below 2.8 to 4.0 N m (25 to 35
in. lbs.) for new b earings, or 0.56 to 1.7 N-m
(5-15 in. lbs.) for used bearing s (figure 12).
• If the preload torque is below the preloads
given above, continue torquing the nut in sm all
increm en ts. C h e c k th e
tig h te n in g . E a c h
b earin g p relo ad
bearing preload is ex ce ed ed , the pinion will
have to be rem oved, and a new collapsible
sp ac er installed.
• O n c e the preload has been obtain ed , rotate
the pinion several tim es to assure that the
bearings have seated. R e ch ec k the preload,
and adjust if necessary.
11. P inion c a g e (10) to th e ax le housing. R e fer to
" Pinion Installation" in this section.
U s in g an in c h -p o u n d
p relo ad after each
tig h te n in g in c re a s e s th e
by several pounds. If the
PINION INSTALLATION
I+ + I Install or C onnect
Tools Required:
J
34943 Pinion Pilot Bearing Installer
J
8092 Driver Handle
1. Pinion pilot bearing (15) using
(figure 13).
• Bolt the guide plate to the axle housing.
• Place the bearing (15) onto the guide.
• Drive the bearing into the housing. The part
number of the bearing must face the pinion
flange.
• Measure the pinion bearing shims (11). If a new
pinion and ring gear set is installed, the pinion
bearing shim pack must be adjusted.
• Examine the heads of the new and old drive pinions.
C om pare th ese codes, and a d ju s t th e pin ion
bearing shim pack accordingly. The chart in figure
14, shows the proper adjustment to be made to the
shim pack.
• Pinion service shims are available in sizes from
0.006 to 0.024-inch.
• If the original pinion is being used, the original
pinion shims should also be used.
2. Pinion bearing shims (11) to the pinion cage.
• The shims, housing, and cage must be clean.
3. The pinion cage (10) to the axle housing (figure 15).
4. Cage bolts (7).
& T ighten
• T h e bolts to 88 N-m (65 ft. lbs.)
DIFFERENTIAL CASE ASSEMBLY
+«-
Install or C onnect (Figure 1)
Tools Required:
J 2 4 4 2 9 S ide B earing A d justm en t S p a n n e r
J 8 0 9 2 Driver H and le
J 8107 S ide Bearing Puller Plug
Lubricate all parts with rear axle lubricant.
Differential pinion gears (32) and thrust w ashers (31)
to the spider (33).
J J
34943 and 8092