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Strange Driveline Noise
I have been noticing a different type of driveline noise and was wondering if there were any suggestions. This howl is most noticeable between 20-30 mph, from a stop. It is fairly faint, so I can't tell for sure if it is coming from the front or rear. Here is the strange part, the howl is rpm matched. In other words, it gets a higher pitch as rpms increase and goes away after the transmission shifts. I think it is highest at close to 3000 rpms.
I have been waiting for a weekend without rain or snow to check the rear end fluid. The rear fluid and transmission fluid were changed at the dealer just before 30k, about 9 months ago. There is no evidence of seals leaking. I first noticed it the howl was about a month ago during when the avg high temp was in the teens. BTW the truck is an '05 KC, 2 wheel-drive, w/ Big Tow. It has about 35,000 miles. The towing history is pretty short: 500 miles of about 3500 lbs in 2006 & 120 miles of about 3000 lbs about 7 months ago.
Any ideas would be appreciated.
Last edited by meltingpoint; 03-13-2010 at 03:37 PM.