GM Service Manual Online
For 1990-2009 cars only

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Inspect for a knock at low speeds.

    • Replace any worn drive axle CV joints.
    • Replace any worn side gear hub.

Inspect for a noise most pronounced on turns.

Correct any abnormalities in the differential gear.

Inspect for a clunk upon acceleration or deceleration.

    • Tighten any loose engine mounts.
    • Replace any worn drive axle inboard joints.
    • Replace any worn differential pinion shaft in the case.
    • Replace any worn side gear hub in the case.

Inspect for a clunking noise in turns.

Replace any worn outboard CV joint.

Inspect for a vibration.

    • Replace any rough wheel bearing.
    • Replace any bent drive axle shaft.
    • Replace any out-of-round tires.
    • Balance any unbalanced tire.
    • Replace any worn CV joint in the drive axle shaft.
    • Correct an excessive drive axle angle by adjusting the trim height.

Inspect for a noise in the NEUTRAL gear with the engine running.

    • Replace any worn cluster bearing shaft.
    • Replace any worn clutch-release bearing.
    • Replace any worn input shaft cluster gears.
    • Replace any worn 1st gear/bearing.
    • Replace any worn 2nd gear/bearing.
    • Replace any worn 3rd gear/bearing.
    • Replace any worn 4th gear/bearing.
    • Replace any worn 5th gear/bearing.
    • Replace any worn mainshaft bearings.

Inspect for a noise in the 1st gear only.

    • Replace any chipped, scored, or worn 1st gear constant mesh gears.
    • Replace any worn 1st-2nd gear synchronizer.
    • Replace any worn 1st gear/bearing.
    • Replace any worn differential gear/bearing.
    • Replace any worn ring gear.
    • Adjust, repair, or replace the shift lever and the rods.

Inspect for a noise in the 2nd gear only.

    • Replace any chipped, scored, or worn 2nd-gear constant mesh gears.
    • Replace any worn 1st-2nd gear synchronizer.
    • Replace any worn 2nd gear/bearing.
    • Replace any worn differential gear/bearing.
    • Replace any worn ring gear.
    • Adjust, repair, or replace the shift lever and the rods.

Inspect for a noise in the 3rd gear only.

    • Replace any chipped, scored, or worn 3rd gear constant mesh gears.
    • Replace any worn 3rd-4th gear synchronizer.
    • Replace any worn 3rd gear/bearing.
    • Replace any worn differential gear/bearing.
    • Replace any worn ring gear.
    • Adjust, repair, or replace the shift lever and the rods.

Inspect for a noise in the 4th gear only.

    • Replace any chipped, scored, or worn 4th gear or output gear.
    • Replace any worn 3rd-4th gear synchronizer.
    • Replace any worn 4th gear/bearing.
    • Replace any worn differential gear/bearing.
    • Replace any worn ring gear.
    • Adjust, repair, or replace the shift lever and the rods.

Inspect for a noise in the 5th gear only.

    • Replace any chipped, scored, or worn 5th gear or output gear.
    •  Repair any worn 5th gear synchronizer.
    • Replace any worn 5th gear/bearing.
    • Replace any worn differential gear/bearing.
    • Replace any worn ring gear.
    • Adjust, repair, or replace the shift lever and the rods.

Inspect for a noise in the reverse (R) gear only.

    • Replace any chipped, scored, or worn reverse idler gear, idler-gear bushing, input gear, or output gear.
    • Replace any worn 1st-2nd gear synchronizer.
    • Replace any worn output gear.
    •  Replace any worn differential gear/bearings.
    • Replace any worn ring gear.

Inspect for a noise in all gears.

    • Add sufficient lubricant.
    • Replace any worn bearings.
    • Replace any chipped, scored, or worn input-gear shaft or output-gear shaft.

Inspect for the transaxle slipping out of gear.

    • Adjust or replace the linkage as needed.
    • Adjust, repair, or replace any binding shift linkage.
    •  Tighten or replace the input-gear bearing retainer as needed.
    •  Repair or replace any worn or bent shift fork.

Inspect for a leak in the area of the clutch.

    •  Repair the transaxle casing.
    • Replace any damaged release bearing guide.

Inspect for a leak at the center of the transaxle.

    •  Repair the transaxle casing.
    •  Repair the shift mechanism.
    •  Replace the damaged backup lamp switch.

Inspect for a leak at the differential.

    •  Adjust or replace the bearing retainers.
    • Tighten or replace the differential cover.
    • Adjust or replace the drive axle shaft seals.

Inspect for a hard shift.

    •  Replace any damaged release-bearing guide.
    • Adjust, repair, or replace the shift mechanism.
    • Adjust, repair, or replace the clutch-release system.
    •  Replace any chipped, scored, or worn 5th gear synchronizer.
    • Replace any chipped, scored, or worn 1st-2nd gear synchronizer.
    • Replace any worn 3rd-4th gear synchronizer.
    • Adjust, repair, or replace the shift lever and the rods.

Inspect for a clashing of gears.

    • Replace any damaged release-bearing guide.
    •  Adjust, repair, or replace the clutch-release system.
    •  Replace the chipped, scored, or worn input shaft/gear-cluster gears.
    • Replace any worn 5th gear synchronizer.
    •  Replace any worn 5th gear/bearing.
    •  Replace any worn 1st gear/bearing.
    • Replace any worn 1st-2nd gear synchronizer.
    • Replace any worn 2nd gear/bearing.
    • Replace any worn 3rd gear/bearing.
    • Replace any worn 3rd-4th synchronizer.
    • Replace any worn 4th gear/bearing.
    • Replace any worn reverse-idler gear.