K 1500 Truck 4WD V8-4.8L VIN V (1999)
The 5-cut gearsets show as a "no-bias" or "square" pattern (1) when rolled with marking compound. On a 5-cut gearset, the height of the tooth increases
from the tooth's toe to heel.
^
The technician is attempting to adjust the gearset contact pattern by changing only the pinion shim thickness instead of changing the backlash of the
gearset.
Generally, changing the pinion shim thickness will cause the gearset contact pattern to move either from the face side to the flank side of the tooth or
from the flank side to the face side of the tooth. Toe-to-heel and heel-to-toe gearset pattern adjustments can generally be accomplished by changing
the amount of backlash that is between the drive pinion and the ring gear.
Both gearsets use the same procedure to adjust the backlash. Refer to the Rear Drive Axle subsection of the Service Manual for procedures on
adjusting backlash.
Important:
The pinion nut and washer should be replaced whenever the ring and pinion is serviced. Before the nut is removed, verify the rolling resistance.
Refer to the Rear Drive Axle sub-section of the Service Manual for further information.
Parts Information
Two-cut ring gear kits are now available. The 2-cut gear kit(s) includes a gear set, a pinion spacer (crush sleeve), and ten cover bolts. The kit(s) does not
include a pinion nut and washer.
At the time of this publication, the 3.08 inch axle ratio gear set is NOT available from GMSPO. This bulletin will be revised when the kit becomes
available.
Parts are currently available from GMSPO.
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