2019 Silverado Trail Boss

[Whiz]

I tried posting this thread a few minutes ago, but it must have been sent to Electricity Heaven while I was answering phone calls.  I could not find it to finish it.

 

Just took delivery of a new the Double Cab Trail Boss 4x4.  It has the typical 6-speed tranny running 3.42 gears.  I had the dealer install 20" wheels and tires and think I want to gear it down to 4.10/4.11's.  I did this with my 2013 Silverado 4x4 and loved how it moves around town.  Even on the highway it can get right up there in a blink of an eye.  Out here in South Dakota the Interstate is posted at 80 mph, but it seems that 85-86 is safe.  I've driven by many a state trooper running radar at 85 and they do nothing.  I am unconcerned about mileage.

 

Anyway, I attempted to order the front and rear ring and pinion gears from Summit Racing yesterday.  They called this morning saying they were unsure of what differentials are in the Trail Boss.  Another party emailed my today stating that he'd heard the either the front or rear ring gears were welded to the differential.  Someone else notified me that GM is using an AAM with an "in-house" version for the other end.

 

I'd buy lunch if someone out there in Chevy Land actually knows positively what to order for my endeavor.

 

If I posted incorrectly here, sorry.  I do have a PhD in computer science, but long retired.  Been a member since 2003, but never posted.