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If you notice it in both 4th and 5th and it is only when you back off it is likely to be the diff, jump under and have a look at the rear pinion flange is the seal leaking/flange loose. My guess wool be pinion bearing (small one) or loose pinion as under accel it will drive the pinion forward but if loose under decel it wants to get pulled toward the crown wheel which usually causes noise
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