Installation And A Djustm Ent - GMC 1982 Light Duty Truck Service Manual

CODE N U M B E R ON O R IG I N A L PIN ION
+
1
+2
+ A D D .001 A D D .002 A D D .003 A D D .004
-
2
SUBT.
CODE
+1 -
.001
N U M B E R
ON
SUBT. SUBT.
S ER VIC E
0
.002 .001
PIN IO N
SUBT. SUBT.
-1
.003
.002
SUBT. SUBT.
- 2
.004 .003
Fig. 4B2-22— Pinion Depth Codes
in s ta lla tio n a n d A d ju s tm e n t
1. Examine the head of the drive pinion for a pinion depth
code number.
2. Com pare the depth code number with the number on
the original pinion. Use the following chart to select the
proper shim for preliminary setting of pinion depth.
0 -1 -2
A D D
A D D A D D
.003
.001 .002
A D D A D D
-
.001
.002
SUBT. A D D
-
.001 .001
SUBT. SUBT.
-
.002
.001
3. Refer to the thickness of the shim recorded earlier in
Pinion Removal procedures. Increase or decrease the
shim dimension as indicated by the chart in figure
4B2-22.
a. For example, if original shim measured .014 inch,
original code was -1 and new code is + 2 , the correct
shim would be .014 inch plus .003 = ,017inch.
b. If original shim was .012 inch, original code + 2 , and
new code is -2, the correct shim would be .012 minus
.004 = .008 inch.
4. Place the pinion shim as determined in step 3 onto the
carrier housing, making sure the bolt holes align with
those of carrier, and that the mating surfaces are clean
and free from foreign material.
5. Place the pinion retainer assembly into position, and
align bolt holes to carrier. Install retaining bolts and
tighten in a crosswise manner. Torque to specifications.
6. Following dirve pinion service, a G ear Tooth Contact
Pattern Check must be made.
O PERATIO N AL CHECK A N D ADJUSTM ENTS
Four adjustments are essential for proper operation of
the differential and its related parts. These adjustments are
a) Pinion Bearing Preload, b) Side Bearing Preload, c)
Pinion Depth and d) Ring Gear-to-Pinion Backlash.
Refer to Section 4B for description of how to perform
these checks and adjustments.
REAR A X LE 4 B 2 -9