Tahoe 4WD V8-393 6.5L DSL Turbo VIN S (1995)
Fig. 19 Gear tooth contact inspection
1.
Ensure that pinion depth and bearing preload are properly adjusted.
2.
Install differential case assembly and selected side bearing shims. Refer to
Side Bearing Preload & Backlash. See: Adjustments
3.
Install bearing caps in proper position and torque cap bolts to 55 ft. lbs.
4.
Rotate assembly to ensure that bearings are properly seated.
5.
Mount dial indicator on housing with plunger bearing against tooth on ring gear,
Fig. 18. Use small contact button on indicator plunger so that
contact can be made at heel end of tooth and position dial indicator with plunger in line with gear rotation and perpendicular to gear tooth.
6.
Hold pinion stationary and rock ring gear back and forth while reading backlash on indicator.
7.
Check backlash at 3 evenly spaced positions around ring gear and record readings.
If backlash varies by more than .002 inch at any position,
check ring gear installation and runout, and correct as needed.
8.
If backlash is not within specifications, remove differential case assembly and bearing shims keeping shims in order.
If ring gear and pinion are
being reused, backlash should be adjusted as close as possible to value measured prior to disassembly.
9.
Backlash is adjusted by increasing thickness of one shim while decreasing thickness of opposite side shim by the same amount in order to maintain
proper side bearing preload. Select shims to adjust backlash as follows:
a. If backlash is excessive, decrease thickness of shim on gear tooth side and increase thickness of shim on opposite side by the same amount.
b. If backlash is less than specified, increase thickness of shim on gear tooth side while decreasing thickness of opposite shim by the same
amount.
On models with 7-1/2 & 7-5/8 inch ring gear, each .002 inch change in shim thickness alters backlash by .001 inch. On models
with 8 1/2 and 8 5/8 inch ring gear, each .003 inch change in shim thickness alters backlash by .002 inch.
