So I took it out for a test run and at first within a block I could hear the howling but kept driving and got about two blocks down the road and the sound quieted down. I can also hear the howling more when i let off the gas and coast. Any suggestions?Just want to say thanks to you both for your time. You both invested a lot of time examining all my results and guiding me in the right direction. I feel like I just graduated from Ring and Pinion class 101. Again thank you. I will start the final assembly with the permanent bearings and shims now. I'll I reveal the results soon.