Whine at 60mph to 65mph
 

I have a slight rear end whine from 60-65mph, it is there when I am appling the gas but goes away when I let off. It's only really noticeable in the 60-65 area. Any ideas, my fron pinion seal was leaking ? Bearing out ?

Mine has the same problem and was like this when new. Went to two dealers and both said they couldn't hear any whine. Bunch of deaf jackoffs.

If this just started happening and you've had your gears for a while it may be a sign of your gears going out of alignment. I would check for leaks at the pinion seal and cover seal.

I had a pinion seal leak and repaired it, got me thinking though.
I am pretty sure I have a pinion bearing that went bad. The gear lube is toast from heat.