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Hello. I've had a good search on here and the Wiki as well as trawling through google but have been unable to come up with an answer to this problem. Basically from 25 mph there starts to be a whirring/whining noise. The noise peaks at 40mph and dulls slightly higher than that, then when slowing back down to 40 it raises in volume again. It appears to be coming from the diff. Can anyone point me in the direction of what the problem may be and the solution to it or outright tell me what's wrong with it? Sorry if I've missed anything off. Thanks in advance.
 
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