Hello all, I have been hearing a kinda roar in the cab and it sounds like it may be around the rear, can't really nail it down. The noise is not constant, I can hear it between 68-72 mph or so, kinda a ruu ruu ruu, not a grinding noise. I have changed front and rear diff fluid to amsoil and the transfer case also. Never hear it any other time. I have just turned 79k on the truck in my sig. any ideas?:banghead:
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