New Gearset High Pitched Squeal

[cebra]

I put a new R&P (3.42 Excel by Richmond Gears) in and a Auburn Gears Positraction along with a Richmond Gears Install Kit. We measured the backlash many times at .008 and the pattern on the gears we thought matched the picture in the instructions on both sides...maybe slightly toward the outside (heel?) of the ring gear (see pics). The turning force of the pintion once it was installed/sleeve crushed was in spec at 25 inch lbs. At 40 mph I develop a crazy loud ear piercing high speed squeal and it gets worse with speed. We jacked the truck up and it was very noticeable and only changed slightly when let off the accelerator (seemed to be more speed induced). Any thoughts on this would help? Do I need to let the gears break in more?