GMC 1976 ZEO 6083 Maintenance Manual page 132

FRONT SUSPENSION
3A- 3
Problem
Possible Cause Correction
Noise in Front End
1 . Ball joints and 1 . Lubricate at recommended
steering linkage intervals.
lubrication.
2. Shock absorber loose or 2. Tighten bolts and/or replace
bushings worn . bushings .
3 . Worn control arm
3. Replace bushings .
bushings .
4. Worn tie rod ends .
4. Replace tie rod ends .
5 . Loose stabilizer bar .
5. Tighten all stabilizer bar
attachments.
6. Loose wheel nuts .
6. Tighten the wheel nuts to
proper torque.
7 . Loose suspension bolts.
7. Torque to specifications or
replace.
Tire Thump 1 . Tire and wheel out of
1 . Balance wheels .
balance.
2. Tire and wheel out of
2. Replace tire .
round.
3 . Blister or bump on tire.
3. Replace tire .
4. Improper shock absorber
4. Replace shock absorber.
action .
Excessive or Uneven 1 . Underinflated or
1 . Inflate tire to proper
overinflated tires. recommended pressure .
2 . Improper toe-in . 2. Adjust toe-in .
3 . Wheels out of balance. 3. Balance wheels .
4. Hard Driving. 4. Instruct driver .
5 . Over loaded vehicle.
5. Instruct driver .
Scuffed Tires 1 . Toe-in incorrect.
1 . Adjust toe-in to specifications .
2. Excessive speed on
2. Advise driver.
turns.
3 . Tires improperly inflated 3. Inflate tires to proper
recommended pressure .
4. Suspension arm bent or 4. Replace arm .
twisted.
Cupped Tires 1 . Front shock absorbers 1 . Replace shock absorbers.
defective.
2. Worn ball joints . 2. Replace ball joints .
3 . Wheel and tire out of 3. Balance wheel and tire .
balance.
4. Excessive tire or
4. Compensate for runout .
wheel runout .