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Have you checked the gear oil level? If the level is normal, and no water in the oil - water in the oil means that bearings and seals may have rusted, and the oil turns light gray. If the oil is OK then the most likely cause is that the gearbox is very worn and needs to be repaired. also check the rear end. old oil (low oil and worn bearings cause the rear end to wine too. Take the bolt out of the back of the differential and stick your finger in ther when it's not hot. if you get oil on your finger right away there is enough, if not change the oil. recommend a 75w80 or 90 gear oil it probably holds 6 to 8 pints depending on the equipment the truck has. If the bearings are shot a new third member (differential ) runs about $250 at a salvage yard, make sure to get the right gear ratio for your application, and if it is 4x4 the front and rear must have the same ratio.

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Q: Why does 1991 Toyota 4wd transmission whine in second third and fifth gear?
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