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Why does the rear differential thumps from starts to 15 mph?

\015 When taking a normal start, the rear differential thumps up to 15mph. It does not do it with a slow start or when accelerating above 15 mph.\015 Posted / edited by AnonymousUser on : 26-10-2020

Answers :

Check the fluid in the differential, and when you can, get a small sample of the heavy oil that is in there, and see if there is any ground up metal in it.
Shake the drive shaft back and forth where it enters the differential, there should be just a little looseness. If these is just a little,
please check the u-joints on the drive shaft.
Sounds like one has failed.
Normally you can grab the u-joint and shake it, and feel the looseness, however, you may choose to look more closely and disconnect each u-joint partly to see if there is bearing failure.
For every differential failure, there are about 25 or more u-joint failures.
Be blessed.
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