Could this be oil related, just checked the engine oil and it was about a quart low, don't freakin know how because I have not driven since my last change and it does NOT leak oil:dontknow:Stinker said:tone take a look at the truck tommorrow, check each and every fluid, ps, trans, axle , so on.
check them all for being low, and smell.
if the pitch changed with rpms then it was something rotating, so follow that.
alternator, power steering, something in the trans, or rear axle, look over those areas.