Ring Gear Backlash
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1990 GMC Pickup, 1990 GMC Cab & Chassis, 1990 Chevrolet Pickup, 1990 Chevrolet Cab & Chassis, and 1989 GMC Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Using sleeve adjusting wrench, tighten right adjusting sleeve until no acklash is present, which is approximately 100 ft. lbs. (140 N.m).
- Using sleeve adjusting wrench (K10/20 Series) or adjuster plug wrench (K30 Series), tighten left adjusting sleeve until no backlash is present, which is approximately 100 ft. lbs. (140 N.m).
- Mark location of adjusting sleeves or adjuster plug in relation to carrier halves so notches in sleeves or adjuster plug can be counted when turned. Turn right sleeve out 2 notches using sleeve adjusting wrench. Turn left sleeve (K10/20 Series) or adjuster plug (K30 Series) in one notch.
- Rotate pinion several times to seat bearings. Mount Dial Indicator Base (J-34047-3) in oil filler plug hole on left side of carrier case. Mount Dial Indicator (J-34047) and Adapter (J-8001-1) through oil vent plug hole so that indicator stem is touching a ring gear tooth. See Fig 1. Use a small button on indicator stem so contact can be made near heel end of tooth angle for accurate backlash reading.
- Hold pinion stationary while taking backlash readings. Check and record backlash at 3 or 4 points around ring gear. Gear backlash should be .003-.010" (.08-.25 mm), with a preferred measurement of .005-.007 (.13-.18 mm). Backlash should be the same at each point measured within .002" (.05 mm).
- If backlash is not within specification, equally turn right and left adjusting sleeves as necessary. To increase backlash, turn left sleeve (adjuster plug on K30 Series) in and turn right sleeve out an equal amount. To decrease backlash, turn right sleeve in and turn left sleeve (adjuster plug on K30 Series) out an equal amount. Turning sleeve (or adjuster plug on K30 Series) one notch will change backlash about .003" (.08 mm). DO NOT install/bend sleeve locks at this time.