2000 Limited, Selectrac, 4.7 V8, 85k miles.
At a certain fairly high steady speed, I get a whining noise. Starts at about 55, loudest at 60 and diminishes to 65 when it goes away.
If I'm accelerating, no noise. It only occurs if at steady speed or on decel. Only happens in that 10 mph window. Quiet at 50 and at 70.
Noise seems to be coming from under the tranny or xfer case area. Definitely not the rear axle.
Anyone know what's up? I've never had Selectrac before, understand it's rare with V8 limited; could it be the transfer case? I can't tell exactly where it's coming from; could be trans.
Don't think it's the front axle, I drive in 2wd on the highway (and 99% of the time anyway).
Don't want to damage anything.
Please don't tell me to just drive below 55 and above 65. Trying to figure what's wrong.
Thanks in advance.