Specifications

Assembly and Installation
42 MAINTENANCE MANUAL
3.Ifyoucan’tndthePCnumberorit’sunread-
able, install a new shim pack of the same
thickness that you measured in Step 1.
NOTE:
The following calculation is the opposite for
a rear differential, forward tandem or single.
4. If the old pinion cone variation number of a
front tandem differential is a plus (+), ADD
the cone variation number to the old shim
pack thickness that was measured in Step 1.
5. If the old pinion cone variation number of a
front tandem differential is a minus (–), SUB-
TRACT the cone variation number from the
old shim pack thickness that was measured
in Step 1.
6. Find the pinion cone variation number on the
new drive pinion that will be installed. Record
the number.
7. If the new pinion cone variation number of a
front tandem differential is a plus (+), SUB-
TRACT the variation number from the stan-
dard shim pack thickness that was calculated
in Step 4 or Step 5. Use new shims to make
a shim pack to the determined thickness. See
Table F.
8. If the new pinion cone number of a forward
tandem differential is a minus (–), ADD the
number to the standard shim pack thickness
that was calculated in Step 4 or Step 5. Use
new shims to make a shim pack to the deter-
mined thickness. See Table F.
Drive Pinion Assembly
The depth of the drive pinion and ring gear con-
tact is controlled by the thickness of the shim
pack. Figure 5.4.
• Toincreasethethicknessofthedrivepinion
contact, increase the thickness of the shim
pack.
• To decrease the depth of the drive pinion
pattern, decrease the thickness of the shim
pack.
TABLE F
INNER BEARING
CUP
DRIVE PINO
SHIMS
INNER BEAR-
ING CONE
OUTER BEARING
CONE
Exemplos mm inches
1.Old Shim Pack Thickness
Old variation PC =PC+2
Standard Shim Pack Thickness
New variation PC=PC+5
New Shim Pack Thickness
0,780
+0,050
=0,810
-0,120
=0,690
0,030
+0,002
=0,032
-0,005
=0,027
1.Old Shim Pack Thickness
Old variation PC=PC-2
Standard Shim Pack Thickness
New variation PC=PC+5
New Shim Pack Thickness
0,780
+0,050
=0,710
-0,120
=0,590
0,030
+0,002
=0,028
-0,005
=0,023
1.Old Shim Pack Thickness
Old variation PC=PC+2
Standard Shim Pack Thickness
New variation PC =PC-5
New Shim Pack Thickness
0,780
+0,050
=0,810
-0,120
=0,930
0,030
+0,002
=0,032
-0,005
=0,037
1.Old Shim Pack Thickness
Old variation PC=PC-2
Standard Shim Pack Thickness
New variation PC=PC-5
New Shim Pack Thickness
0,780
+0,050
=0,710
-0,120
=0,830
0,030
+0,002
=0,028
-0,005
=0,033
Figure 5.4
OUTER BEARING
CUP