GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Chassis Greasing


Chassis greasing should be performed every 6 months or 7,500 miles for trucks used in normal/light service. More frequent greasing is recommended for trucks in heavy/severe usage; about every 3 months or 3,000 miles. Greasing can be performed with a commercial pressurized grease gun or at home by using a hand-operated grease gun. Wipe the grease fittings clean before greasing in order to prevent the possibility of forcing any dirt into the component.

The four wheel drive front driveshaft requires special attention for lubrication. The large constant velocity joint at the front of the transfer case has a special grease fitting in the centering ball. A special needle nose adapter for a flush type fitting is required, as well as a special lubricant (GM part No. 1052497). You can only get at this fitting when it is facing up toward the floorboard, so you need a flexible hose, too.

Water resistant EP chassis lubricant (grease) conforming to GM specification 6031-M (GM part No. 1052497) should be used for all chassis grease points.

Every year or 7500 miles (12,067 km) the front suspension ball joints, both upper and lower on each side of the truck, must be greased. Most trucks covered in this guide should be equipped with grease nipples on the ball joints, although some may have plugs which must be removed and nipples fitted.

Do not pump so much grease into the ball joint that excess grease squeezes out of the rubber boot. This destroys the watertight seal.

  1. Raise up the front end of the truck and safely support it with jackstands. Block the rear wheels and firmly apply the parking brake.
  3. If the truck has been parked in temperatures below 20ºF (-7ºC) for any length of time, park it in a heated garage for an hour or so until the ball joints loosen up enough to accept the grease.
  5. Depending on which front wheel you work on first, turn the wheel and tire outward, either full-lock right or full-lock left. You now have the ends of the upper and lower suspension control arms in front of you; the grease nipples are visible pointing up (top ball joint) and down (lower ball joint) through the end of each control arm.
  7. If the nipples are not accessible enough, remove the wheel and tire.
  9. Wipe all dirt and crud from the nipples or from around the plugs (if installed). If plugs are on the truck, remove them and install grease nipples in the holes (nipples are available in various thread sizes at most auto parts stores).
  11. Using a hand operated, low pressure grease gun loaded with a quality chassis grease, grease the ball joint only until the rubber joint boot begins to swell out.

The steering linkage should be greased at the same interval as the ball joints. Grease nipples are installed on the steering tie rod ends on most models.

  1. Wipe all dirt and crud from around the nipples at each tie rod end.
  3. Using a hand operated, low pressure grease gun loaded with a suitable chassis grease, grease the linkage until the old grease begins to squeeze out around the tie rod ends.
  5. Wipe off the nipples and any excess grease. Also grease the nipples on the steering idler arms.

Use chassis grease on the parking brake cable where it contacts the cable guides, levers and linkage.

Apply a small amount of clean engine oil to the kickdown and shift linkage points at 7500 mile (12,000 km) intervals.