Join Date: Sep 2009
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I have ~45,000 mi, of which a large majority (80-90% I'd guess) are highway. Of the highway miles the vast majority has been with the vehicle moderately heavily loaded with car-camping gear, and also a fair amount of high speed mountain driving. The shudder has been happening for something like 10,000-15,000 mi but I feel like it has gotten a bit worse. The problem is it's not something I think I'd be able to get a dealer mechanic to notice during a ride-along unless the mechanic had come across the same problem before. I try to point it out to my wife and she always thinks it's bumps in the road.
Thinking about the mileage, I would expect I have probably done more 4th -> 5th upshifts than the average user, and many of them with a moderate load in the vehicle.