My wife is the AT4 is the primary driver - I get it on weekends. She insisted on the nicer interior of the AT4 - especially the better quality leather and ventilated seats. The unperforated, unventilated, and plasticy leather seats in our prior SubZ71 were a great motivator to step-up to the AT4. Love the tailgate and surprised to have become accustomed to the head's-up display. The 10-speed transmission is so intuitive both in normal\spirited on road driving and in Low-range off-road that I do not bother with shifting manually, something I did often with the SubZ71. I have never tried the 8-speed tranny, so cannot comment on it.
Typically the only time I use the manual shifting is in 4Lo and climbing grass/gravel slopes or tiptoeing through rocky creeks. I hate the buttons, as I have to take my eyes off the trail to find the toggle buttons. The good news is that the 10-speed transmission is really good offroad and does a great job of being in the right gear for the situation; hence, I do not use manual shifting near as much with prior trucks/SUVs.
We chose 20" wheels because I thought the MTR's would be too noisy, I will most likely put Brembo's on, and my wife said she wanted the 20's. The GY TrailRunners are a great onroad tire, and I'll see how they do offroad this weekend. I have not driven the shortbed AT4, but my brother in-law bought a shortbed AT4 5.3L the day before us. My wife drove both extensively and said the shortbed is "a bit more bouncy but more maneuverable"...... I can say that the ride in our standard is plush, and softer than our prior 2016 Z71 with much better dampening and range. It only rides like a truck on cement freeways where it just jiggles up and down.
I got the GM\Borla Touring cat-back put on before I picked-up the truck from the dealer - easier than justifying to SWMBO later on. Absolutely no drone at any speed and/or while in V4. Quieter than most cat-backs - not loud or obnoxious in any way. You will not hear it at all unless you are giving it a lot of throttle or over 3K rpms. It has an extra baffle in it that prevents the drone, which is, I suspect, better at cancelling out the drone in the stock exhaust in AFM mode. The Nokian's are 32.1", and the exact same diameter and width as the optional 22" wheel\tire. No issues fitting on the stock rims or balancing.
I ordered mine, as I could not find a silver one with all of the options I wanted - long process and wait. Absolutely no buffeting or vibration in my '16 Z71. I did notice both in two 2015 Sub rentals that I had for two weeks a piece.
Very nice - I got a silver one, but really like the Iridium (your color?). I put Nokian Rotiiva 275/65-18's on, as I had a lot of wheelspin with the GY's offroad. Otherwise, I was very satisfied with the GY's. The Nokians are the rare Traction and Temperature A, 700 Treadware. AT's, and have the mountain snowflake. Actually a bit quiter on the road too.
Zero drone or fitment issues with the GM\Borla cat-back on my 2016 Z71 after 3K miles. I drove off the dealer lot with it installed when I procured the truck. No vibration or buffeting on the truck either.
Sounds like you gents have deduced a solution - excellent job. As I have a 2016 Suburban Z71, I have been following this thread since before I procured the beast. I do not have the buffeting, and wonder if it is a combination of 18" wheels and crossbars with surfboard pads on top (disrupt the air flow). I have noticed a lot of vibration on two prior long-term rental Yukons when exceeding 75mph, but nothing on my Z71. This reminds me of the radiator fan fiasco that was plaguing all 2005 Subaru Outback turbos (OBXT). Within weeks (seemingly), everyone who had a year old OBXT was experiencing their radiator fans running continuously - first start-up on a 30 degree morning and the radiator fan was going full blast. Noone's dealer could find a fix, and I had taken my OBXT in 7 times to get it resolved. Finally, one gentleman's dealership figured out the fix on their own - no help from Subaru. The gentleman put a pdf of the workorder online, and everyone took it to their respective dealers with instructions to just "do this". My OBXT, of course, had a for sale sign on it at that point.
They also removed all of the aerodynamic dangly bits from the front - nice.
FWIW the GM-spec Borla exhaust has absolutely no drone in AFM or at any other time. It is a very subdued cat-back; however. GM did spec an anti-drone flap/valve into the Borla muffler.
We picked-up a 2016 Suburban Z71 last week and only have 250miles on it, but we are driving up to Tahoe over the long weekend and I will report back any anomalies. After reading this thread, I was very hesitant to go ahead with the order. But as Tobtek correctly states, there are no alternatives. If we had only two sons, then we would have an LR4; but, we have three. Luckily (oddly?) enough our three land rover product purchases have been very very reliable. No booming or other issues to report, and I am really looking out for all of the issues identified on the 2015's.
The SRA's are not that well thought of - typical OE tire. I'm planning on immediately swapping out the Z71 OE SRA's for Michelin LTX AT2's, as I need an AT tire. If I were to stay with an AS, I would pick the LTX MS2. Consumer Reports also selected both of these favorably. http://www.tirerack.com/tires/surveyresults/surveydisplay.jsp?type=HAS
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