I'm going with the 3.55 I have right now. I may even change my mind again before I install them and go 3.36 most of my driving is on highways or roads that are 50+mph.2800 RPM at 60 MPH.
Thank you. I got it figured out. I had an early pinion gear that was .150" shorter causing me from getting my backlash.Be careful, even from Yukon. I just went through this crap with my 12 bolt the last couple of months and it turned out my new Yukon that was to be a 3 series carrier turned out to be a 4 series which let me down the path of WTF do I do now crap. I have some extra non-posi carriers to test if you need one, but you'll have to pay for the shipping.