The shop I went to uses US Standard gears, which seems to be off-brand Yukons. My 4.56s are silent after 500 miles. Couldn’t be happier
Supply chains are disasters right now though. They had insane issues getting the gears, the detroit trutrac, and even the gasket.
Trutrac was on backorder, but luckily still came in on time.
The gears were a particular nightmare and ended up pushing my install back a day. Shop ordered the gears from a website only to receive an “oh yeah we don’t actually have those” email 2 DAYS before my truck was scheduled. I got lucky and the guys found some gears elsewhere and paid extra to ship em quick at no charge to me. Unrelated but these guys went above and beyond to get me set up, they were awesome and I have nothing but good things to say about em
Also, the particular gasket the shop uses wasn’t in when I got the gears installed, so they’re supposed to put it on when I get the oil changed out
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