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Noise in front differential
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1. Oil (low or wrong grade)
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2. Excessive backlash between pinion and ring gear
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3. Ring, pinion or side gears (worn or chipped)
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4. Pinion shaft bearing (worn)
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5. Side bearing (worn)
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Oil leak from front differential
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1. Oil (level too high or wrong grade)
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2. Front differential rear oil seal (worn or damaged)
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3. Side gear oil seal (worn or damaged)
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4. Companion flange (loosen or damaged)
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5. Side gear shaft (damaged)
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Oil leak from rear differential
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1. Oil (level too high or wrong grade)
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2. Rear differential fromt oil seal (worn or damaged)
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3. Companion flange (loosen or damaged)
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