Test; Adjustments Affecting Tooth Contact; Axle Tube Assembly; Assembly - GMC T Series 1994 Repair Manual

TEST

1. Wipe oil out of carrier and carefully clean each
tooth of the ring gear.
2. Apply gear marking compound sparingly to all ring
gear teeth using a medium stiff brush. When prop­
erly used, the area of pinion tooth contact will be
visible when hand load is applied.
3. Using a torque wrench, apply a load until a torque
of 62 N-m (45 lbs. ft.) is required to turn the pinion.
• A test made without loading the gears will not
give a satisfactory pattern. Turn the companion
flange with a wrench so that the ring gear
rotates one full revolution then reverse the rota­
tion so that the ring gear rotates one revolution
in the opposite direction. Excessive turning of
the ring gear is not recommended.
4. Observe the pattern on the ring gear teeth and
compare with figure 33.

ADJUSTMENTS AFFECTING TOOTH CONTACT

Two adjustments can be made which will affect the
tooth contact pattern. These are backlash and pinion
depth. The effects of bearing preloads are not easily
seen on hand loaded teeth pattern tests. These adjust­
ments should be within specifications before proceeding
with the backlash and the drive pinion adjustments.
It may be necessary to adjust both pinion depth and
the backlash to obtain the correct pattern.
Pinion depth is adjusted by increasing or*decreasing
the shim thickness between the pinion head and the
inner race of the rear bearing. The shim is used in the
differential to compensate for manufacturing tolerances.
Increasing the shim thickness will move the pinion clos­
er to the centerline of the ring gear. Decreasing the
shim thickness will move the pinion farther away from
the centerline of the ring gear.
Backlash is adjusted by means of the side bearing
adjusting sleeves which move the entire case and ring
gear assembly closer to, or farther from the drive pin­
ion. (The adjusting sleeves are also used to set side
bearing preload). To increase backlash turn the left
sleeve in and turn the right sleeve out an identical
amount. To decrease backlash, turn the right sleeve in
and turn the left sleeve out an identical amount.
It is important that the contact pattern be centrally
located up and down on the face of the ring gear teeth.
CARRIER CASE ASSEMBLY
Install or Connect (Figures 1 through 4)
•B e n d the lock (51) over the sleeves (32). (Right
side only on K3 models).
• Bolt (64) and lock (63) (K3 models).
Remove or Disconnect (Figures 1 through 4)
1. Bolts (28).
2. Right carrier case half.
gp| Clean
• C arrier case and axle tube sealing surfaces.
Remove all grease and oil.
-► «- Install or Connect (Figures 1 through 4, 19,
and 34)
Tools Required:
J 36600 Output Shaft Seal Installer (K1, 2)
J 22833 Output-Shaft Seal Installer (K3).
J 33842 Pilot Bearing Installer
J 36616 Bushing Replacer Set
•A p p ly a bead of sealer (GM P/N 1052942) or
equivalent to one carrier case half sealing surface.
1. Right carrier case half (29).
NOTICE: Refer to "Notice" on page 4C2-1.
2. Bolts (28).
Tighten
• Bolts (28) to 47 N-m (35 lbs. ft.).
3. Left seal (3). Use J 36600 (K1, 2 models) or
J 22833 (K3 models). Drive into place with a soft
faced hammer.
4. Shaft (59) with deflector (2). Drive in place with a
brass hammer.
5. Bearing (21) to the output shaft (23). Use J 33842
(figure 34).
6. Output shaft (23) to the carrier.
7. Vent plug (60). Use a small amount of sealer (GM
P/N 1052942) or equivalent on the threads.
8. Bushings (48). Use J 36616 (figure 19).

AXLE TUBE ASSEMBLY

ASSEMBLY

-► 4- Install or Connect (Figures 1 through 4 and
35)
Tools Required:
J 36609 Bearing Installer
J 36600 Seal Installer (K1, 2 Models)
J 22833 Seal Installer (K3 Models)
1. Bearing (4). Use J 36609. Drive into place with a
hammer.
2. Seal (3). Use J 36600 (K1, 2 models) or J 22833
(K3 models) (figure 35).
3. Shaft (1) with deflector (2) to the axle tube.
4. Washer (7). Align the tabs with the slots in the
tube.
5. Gear (9) with retaining ring (8) (K1, 2 models).
Drive gear into place with a plastic hammer.
6. Washer (11) and new snap ring (12) (K3 models).
Make sure the snap ring seats properly in the
groove.

OUTPUT SHAFT SHIM SELECTION

• Refer to figures 1 through 4.
• It is necessary to select the proper size output
shaft shim (20) if any of the following components
were replaced:
•S h a ft (1).
• Axle tube (5).
• Output shaft (23).