DIAGNOSTIC CHART
CONDITION POSSIBLE CAUSES CORRECTION
WHEEL NOISE 1. Wheel loose. 1. Tighten loose wheel bolts.
2. Faulty wheel hub bearing. 2. Replace bearing.
DIFFERENTIAL CRACKED 1. Improper adjustment of the
differential bearings.
1. Replace differential.
2. Excessive ring gear backlash. 2. Replace differential.
3. Erratic clutch operation. 3. Replace differential.
DIFFERENTIAL GEARS SCORED
1. Insufficient lubrication.
1. Replace differential. Fill
differential with the correct fluid type
and quantity.
2. Improper grade of lubricant.
2. Replace differential. Fill
differential with the correct fluid type
and quantity.
LOSS OF LUBRICANT
1. Lubricant level too high.
1. Drain lubricant to the correct
level.
2. Worn differential side seals. 2. Replace seals.
3. Cracked differential housing. 3. Replace as necessary.
4. Worn pinion seal. 4. Replace seal.
5. Worn/scored yoke. 5. Replace yoke and seal.
6. Differential cover not properly
sealed.
6. Remove, clean, and reseal cover.
AXLE OVERHEATING 1. Lubricant level low. 1. Fill differential to correct level.
2. Improper grade of lubricant.
2. Fill differential with the correct
fluid type and quantity.
GEAR TEETH BROKE 1. Overloading. 1. Replace differential.
2. Erratic clutch operation. 2. Replace differential.
3. Ice-spotted pavement. 3. Replace differential.
4. Improper adjustments. 4. Replace differential.
DIFFERENTIAL NOISE
1. Insufficient lubricant. Fill differential with the correct fluid type and quantity.
2. Improper ring gear and pinion adjustment.
2. Replace differential.
3. Unmatched ring gear and pinion. 3. Replace differential.
4. Worn teeth on ring gear and/or pinion. Replace differential.
5. Loose pinion bearings. . Replace differential.
6. Loose differential bearings. . Replace differential.
7. Misaligned or sprung ring gear. Replace differential


My rear was howling, and i have a wave trac in it ,,it is going to unatrax for a complete check up ,,it comes out of the car tomorrow ,,where i will look inside it,
mine howls from low rpm (loud) to 74 mph then in the howling goes away, it does it on acceleration and de acceleration jim