I finally ended up installing my new rear end, it ended up with 0.010" of backlash which is within spec. However I am noticing a thumping noise on gear shifts and in certain scenarios which make me think the noise is coming from the pinion banging into the ring gear due to backlash. For instance when I bring myself to about 50-60mph and then completely take my foot off the gas to coast for a few seconds when I reapply the gas there is a very noticeable thump and if I reapply gas hard the...

Thumping sound from rear end.