Whine when rolling?

[AALynch]

Hey guys,

My '69 Camaro has an LS1/T56 in it with an ATS trans mount and a 12-bolt with an Eaton posi and Auburn 4.10's. The faster I am, the more noticeable it is - when I am in the throttle, I can hear a "whine" coming out of the rear of the car, and it goes away 100% if I put my foot in the clutch and let it idle. The tone of the whine raises as the car speeds up. It's barely noticeable at 30 mph, fairly loud at 50, and gets pretty damn loud at 80. The car has mono-fiberglass VBP leaf springs in the back.

I measured the pinion angle and found it at +1 degree, with the transmission yoke at 0 degrees, so the pinion angle SEEMS fine, right? The car does not have ANY sound deadener or insulation in it, so the whole car is loud inside - could that noise just be the rear end/gears? I need to change the fluid, and while I've got the cover off I can check backlash.


Thanks for the help,

-Adam