Originally Posted by 01ssreda4

Ive setup a lot of rearends, as well as paid for some when I was younger. I can promise you the way the gears are cut and what they are made out of determines how hard they are to be dead silent. My first ever rear end I did (not knowing anything) was dead silent. Over the years Ive come to realize it was probably bc of the specific gears I used, which were like stock. After a bunch of quiet ones Ive had some consistently noisy ones, and yep you guessed it, its all another kind of gear that always seems to make some kind of noise. NONE have broken through the years, point being, sometimes it (noise) really is out of the control of the installer and doesn't indicate anything is out of spec.