GM Service Manual Online
For 1990-2009 cars only

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Check for a knock at low speeds.

    â€¢ Replace any worn drive axle CV joints.
    â€¢ Replace any worn side gear hub.

Check for a noise most pronounced on turns.

Correct any abnormalities in the differential gear.

Check for a clunk upon acceleration or deceleration.

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

Check for a clunking noise in turns.

Replace any worn outboard CV joint.

Check for a vibration.

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

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

    â€¢ Replace any worn cluster bearing shaft.
    â€¢ Replace any worn clutch-release bearing.
    â€¢ Replace any worn input shaft cluster gears.
    â€¢ Replace any worn first-gear/bearing.
    â€¢ Replace any worn second-gear/bearing.
    â€¢ Replace any worn third-gear/bearing.
    â€¢ Replace any worn fourth-gear/bearing.
    â€¢ Replace any worn fifth-gear/bearing.
    â€¢ Replace any worn mainshaft bearings.

Check for a noise in the first gear only.

    â€¢ Replace any chipped, scored, or worn first-gear constant mesh gears.
    â€¢ Replace any worn first-second gear synchronizer.
    â€¢ Replace any worn first-gear/bearing.
    â€¢ Replace any worn differential-gear/bearing.
    â€¢ Replace any worn-ring gear.
    â€¢ Adjust, repair, or replace the shift lever and the rods.

Check for a noise in the second gear only.

    â€¢ Replace any chipped, scored, or worn second-gear constant mesh gears.
    â€¢ Replace any worn first-second gear synchronizer.
    â€¢ Replace any worn second-gear/bearing.
    â€¢ Replace any worn differential-gear/bearing
    â€¢ Replace any worn-ring gear.
    â€¢ Adjust, repair, or replace the shift lever and the rods.

Check for a noise in the third gear only.

    â€¢ Replace any chipped, scored, or worn third-gear constant mesh gears.
    â€¢ Replace any worn third-fourth gear synchronizer.
    â€¢ Replace any worn third-gear/bearing.
    â€¢ Replace any worn differential-gear/bearing.
    â€¢ Replace any worn-ring gear.
    â€¢ Adjust, repair, or replace the shift lever and the rods.

Check for a noise in the fourth gear only.

    â€¢ Replace any chipped, scored, or worn fourth gear or gear output.
    â€¢ Replace any worn third-fourth gear synchronizer.
    â€¢ Replace any worn fourth-gear/bearing.
    â€¢ Replace any worn differential-gear/bearing.
    â€¢ Replace any worn-ring gear.
    â€¢ Adjust, repair, or replace the shift lever and the rods.

Check for a noise in the fifth gear only.

    â€¢ Replace any chipped, scored, or worn fifth gear or output gear.
    â€¢ Repair any worn fifth-gear synchronizer.
    â€¢ Replace any worn fifth-gear/bearing.
    â€¢ Replace any worn differential-gear/bearing.
    â€¢ Replace any worn-ring gear.
    â€¢ Adjust, repair, or replace the shift lever and the rods.

Check for a noise in the reverse gear only

    â€¢ Replace any chipped, scored, or worn reverse idler gear, idler-gear bushing, input gear, or output gear.
    â€¢ Replace any worn first-second gear synchronizer.
    â€¢ Replace any worn output gear.
    â€¢ Replace any worn differential-gear/bearing.
    â€¢ Replace any worn-ring gear.

Check for a noise in all gears.

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

Check for the transaxle slipping out of gear.

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

Check for a leak in the area of the clutch.

    â€¢ Repair the transaxle casing.
    â€¢ Replace any damaged release bearing guide.

Check for a leak at the center of the transaxle.

    â€¢ Repair the transaxle casing.
    â€¢ Repair the shift mechanism.
    â€¢ Replace the damaged backup lamp switch.

Check for a leak at the differential.

    â€¢ Adjust or replace the bearing retainers.
    â€¢ Tighten or replace the differential cover.
    â€¢ Adjust or replace the drive axle shaft seals.

Check for a hard shift.

    â€¢ Replace any damaged release-bearing guide.
    â€¢ Adjust, repair, or replace the shift mechanism.
    â€¢ Adjust, repair, or replace the clutch-release system.
    â€¢ Replace any chipped, scored, or worn fifth-gear synchronizer
    â€¢ Replace any chipped, scored, or worn first-second gear synchronizer.
    â€¢ Replace any worn third-fourth gear synchronizer.
    â€¢ Adjust, repair, or replace the shift lever and the rods.

Check for a clashing of gears.

    â€¢ Replace any damaged release-bearing guide.
    â€¢ Adjust, repair, or replace the clutch-release system.
    â€¢ Replace the chipped, scored, or worn input shaft/gear-cluster gears.
    â€¢ Replace any worn fifth-gear synchronizer.
    â€¢ Replace any worn fifth-gear/bearing.
    â€¢ Replace any worn first-gear/bearing.
    â€¢ Replace any worn first-second gear synchronizer.
    â€¢ Replace any worn second-gear/bearing.
    â€¢ Replace any worn third-gear/bearing.
    â€¢ Replace any worn third-fourth synchronizer.
    â€¢ Replace any worn fourth-gear/bearing.
    â€¢ Replace any worn reverse-idler gear.