K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Figure 2
Procedure
1.
Measure runout of companion flange, as described in Figure 2. Indicate high point with a mark.
2.
Remove companion flange as described in Section 4B of the Service Manual.
3.
Measure runout of pinion stem at radius between nut thread and spline. Mark low point.
4.
Reinstall pinion companion flange with marks aligned. Tighten pinion nut to specification torque. Refer to Section 4B of the Service Manual.
5.
Remeasure companion flange runout. If excessive runout still exists, do Step 6.
6.
Additional reindexing of the companion flange to the pinion stem splines by one or two teeth may further reduce runout
Remarks
A.
Verify concern. Drive on smooth road up to 65 mph as speed limits permit. Note speeds and severity of disturbance. Assure that disturbance is not
engine or transmission related. Refer to Section OC "Vibration Diagnosis Chart" in the 1989 Service Manual. If disturbance is determined to be
engine/transmission related, disregard use of this bulletin.
