While towing a 9,000 lb trailer today, I encountered some snow and put it into 4wd - it develops a wierd kind of hum/whine around 2200 rpm when I accelerate and goes away around 2300 or so. It does not make the noise in 2wd - have 15,000 miles on it, have not done hardly any 4wd miles either on or off road - wonder if its breaking in or what? Anybody else ever heard this?
Thanks - Murf
