Note the instructions below pretty much cover about all of the GM power steering gear boxes used on trucks. If you see any big differences between this gear and yours, let me know. Also note that these are the only adjustments that GM recommends and it is critical that they are done exactly correct. The factory really does not like these things played with. Too tight will cause steering binding and extreme wear of the gear box, too loose and the truck will wander when steering. Also note that the adjustments are done with the gear box off the truck. Hope these help. Thanks
Off Vehicle Steering Gear Adjustments
Important: Any steering gear adjustment is made only as a correction and not as a periodic adjustment.
Remove the gear from the vehicle prior to any adjustments.
Worm Thrust Bearing Preload Adjustment
J 42882 Adjuster Nut Socket
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the adjuster nut assembly (1) to 28-31 N·m (20-23 lb ft).
Pitman Shaft Over-Center Preload Adjustment
Tighten Tighten the adjuster lock nut to 49 N·m (36 lb ft). Prevent the adjuster screw from turning while tightening the adjuster lock nut.