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07-07-2012, 11:03 AM
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AF Enthusiast
Join Date: Apr 2004
Location: W.Caldwell, New Jersey
Posts: 612
Thanks: 1
Thanked 6 Times in 6 Posts
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Differential Humm
On a hot day (90-95 'F) my 2000 GM differential humms on the highway under slight acceleration 50 mph and above,the mileage is 50,000.Is there an additive to help quiet it or should the oil be changed?
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