changed gears in a 741 now have a whine

I recently did my first gear change in a 741 from 3.23 to 3.73 motive gears and now have a slight whine when foot on the pedal. I could not quite get the 2.77 dim. Motive put on the pinion from the pinion to the center of the carrier bearing. It did however have a good even pattern of the yellow paste I put on the gears and I did get the back lash to .006 as they required by adjusting the carrier bearings. Could my backlash be off, I did seem to notice a good bit of back and forth rocking of the wheels before i set in on the ground the first time after doing the change. Any thoughts, opinions?? thanks