I realize this is an older thread, but I was under my truck today and noticed that the driver's side of the rear diff is nice and clean, but the pass side is not. At first I thought it was grunge burning off the exhaust pipe which runs underneath...do these photos look like what you folks are describing? The last time I changed the VTM+4 fluid (12K miles ago) the fluid level was fine and there are no telltale drips or puddles in my driveway...thanks! PS: my truck is an 07 with 56K miles on it.
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