Dodge 2000 DURANGO Service Manual page 117

DN
DIAGNOSIS AND TESTING (Continued)
Condition
Loss Of Lubricant
Axle Overheating
Gear Teeth Broke
Axle Noise
GEAR NOISE
Axle gear noise can be caused by insufficient lubri-
cant, incorrect backlash, tooth contact, worn/damaged
gears, or the carrier housing not having the proper
offset and squareness.
Possible Causes
1. Lubricant level too high.
2. Worn axle shaft seals.
3. Cracked differential housing.
4. Worn pinion seal.
5. Worn/scored companion flange.
6. Axle cover not properly sealed.
1. Lubricant level low.
2. Improper grade of lubricant.
3. Bearing pre-loads too high.
4. Insufficient ring gear backlash.
1. Overloading.
2. Erratic clutch operation.
3. Ice-spotted pavement.
4. Improper adjustments.
1. Insufficient lubricant.
2. Improper ring gear and pinion
adjustment.
3. Unmatched ring gear and pinion.
4. Worn teeth on ring gear and/or
pinion.
5. Loose pinion bearings.
6. Loose differential bearings.
7. Mis-aligned or sprung ring gear.
8. Loose differential bearing cap
bolts.
9. Housing not machined properly.
8 1/4 AND 9 1/4 AXLE
1. Drain lubricant to the correct level.
2. Replace seals.
3. Repair as necessary.
4. Replace seal.
5. Replace companion flange and seal.
6. Remove, clean, and re-seal cover.
1. Fill differential to correct level.
2. Fill differential with the correct fluid type
and quantity.
3. Re-adjust bearing pre-loads.
4. Re-adjust ring gear backlash.
1. Replace gears. Examine other gears
and bearings for possible damage.
2. Replace gears and examine the
remaining parts for damage. Avoid erratic
clutch operation.
3. Replace gears and examine remaining
parts for damage.
4. Replace gears and examine remaining
parts for damage. Ensure ring gear
backlash is correct.
1. Fill differential with the correct fluid type
and quantity.
2. Check ring gear and pinion contact
pattern.
3. Replace gears with a matched ring gear
and pinion.
4. Replace ring gear and pinion.
5. Adjust pinion bearing pre-load.
6. Adjust differential bearing pre-load.
7. Measure ring gear run-out. Replace
components as necessary.
8. Inspect differential components and
replace as necessary. Ensure that the
bearing caps are torqued tot he proper
specification.
9. Replace housing.
Gear noise usually happens at a specific speed
range. The noise can also occur during a specific type
of driving condition. These conditions are accelera-
tion, deceleration, coast, or constant load.
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Correction