Determining Correct Pinion Starting Shim

Check numbers etched on drive pinion and ring gear. Measure thickness of original pinion shim. Note variance number on pinion gear. See Figure . Determine pinion starting shim thickness as follows:

If original ring and pinion is being installed, use original shim.
If a replacement gear set is being installed, determine best starting shim thickness by noting where the old and new pinion marking columns intersect on chart in Fig. Figure .

The intersecting figure represents the amount needed to add or subtract to the original shim. For example, if old pinion is +1 and new pinion is -3, intersecting figure is +.004" (+.10 mm). Add this amount to original shim. If old pinion is -3 and new pinion is -2, intersecting figure is -.001" (-.025 mm). See PINION VARIANCE CHART . Subtract this amount from original shim.

PINION VARIANCE CHART

Old Pinion Marking	New Pinion Marking	Starting Shim Needed
+4	-4	+0.008
-3		+0.007
-2		+0.006
-1		+0.005
-0		+0.004
+1		+0.003
+2		+0.002
+3		+0.001
+4		0
+3	-4	+0.007
-3		+0.006
-2		+0.005
-1		+0.004
-0		+0.003
+1		+0.002
+2		+0.001
+3		0
+4		-0.001
+2	-4	+0.006
-3		+0.005
-2		+0.004
-1		+0.003
-0		+0.002
+1		+0.001
+2		0
+3		-0.001
+4		-0.002
+1	-4	+0.005
-3		+0.004
-2		+0.003
-1		+0.002
-0		+0.001
+1		0
+2		-0.001
+3		-0.002
+4		-0.003
0	-4	+0.004
-3		+0.003
-2		+0.002
-1		+0.001
-0		0
+1		-0.001
+2		-0.002
+3		-0.003
+4		-0.004
-1	-4	+0.003
-3		+0.002
-2		+0.001
-1		0
-0		-0.001
+1		-0.002
+2		-0.003
+3		-0.004
+4		-0.005
-2	-4	+0.002
-3		+0.001
-2		0
-1		-0.001
-0		-0.002
+1		-0.003
+2		-0.004
+3		-0.005
+4		-0.006
-3	-4	+0.001
-3		0
-2		-0.001
-1		-0.002
-0		-0.003
+1		-0.004
+2		-0.005
+3		-0.006
+4		-0.007
-4	-4	0
-3		-0.001
-2		-0.002
-1		-0.003
-0		-0.004
+1		-0.005
+2		-0.006
+3		-0.007
+4		-0.008