Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
From what I see, your pinion shim is a little thick on the DRIVE which will also effect the coast. I always like the pattern you have right in the center, which will give you NO NOISE on pull and NO whine on coast. A small change gores a long way on the pattern, I'm thinking a smaller shim 0.003 to 0.005 thousands less than what you are using. I know it's a ***** pulling the pinion bearing to change the shim , whereas on a ford 9", it's much easier, but this is GM territory. JMHO and good luck.
David g........
A light hum but i talked to driveline shop in LA and Vegas both with over 30 years installing gears and they said it was the brand i got.
Sent from my SM-G928V using Tapatalk