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Drives

  1. Like new only a couple K on them. Comes with OEM locking lug nuts I am in ****** Ga north of Atlanta. Asking $1200 OBO
  2. Hello all, I have a base 2019 Sierra 5.3 4x4 and bought the front / rear shocks and rear blocks of a AT4 owner who upgraded his suspension Does anyone know if it's necessary to replace the CV axle when installing the 2" lift? Thanks .
  3. Hi. I bought a new 2021 AT4 March 5. 20 miles on it. Drove home from the dealer (4 miles) and the next time I turned it on, CEL and OnStar diagnostics emails me to take it to the service department. They say they reset MAP sensor and send me on my way. Later that day, same thing happens. I take it back in, they say MAP sensory needs replacing. They had it almost 2 weeks waiting on the part. After they replaced it, everything went fine for about 1200 miles and then I get blinking CEL for about 30 seconds then it stops. Next day, blinking CEL for a minute or so, and then it turns solid. I took i
  4. Hello everyone. My first time here. I have a 2021 Sierra AT4 with the 6.2L. I have started to notice a noise when towing our boat that weighs about 6,000lbs. Several times during the trip to and from the lake I hear a rumbling sound that last like 2-4 sec. almost sounds like it can be a jake brake or hitting rumble strips on road. I hit no strips. I can’t recall if it happens on downshift or what. But it does concern me. I drove home from work today with our towing and put it in tow haul mode. It made the noise 3 times in 45 min drive. Any ideas what I’m dealing with? Would it be a bad clutch
  5. Ok, thought I would post after having the Bilstein 6112 front suspension kit placed on my 2021 1500 AT4 today. I've ordered the 5100's for the back, however they won't be in until next week. So, my goal was to get rid of the dang bounce in the truck. The ride wasn't bad, but I thought I would try the 6112's. Immediately I could tell that the truck definitely sits close to level, which I'm ok with a slight rake and I mean slight. I purposely hit a few bumps and the trucks feels more planted or stiffer. It still has a slight bounce, however you can tell the difference and I'm very satisfied. I c
  6. I’m installing some lights in the grill of my AT4 and would like them to come on with the parking lights. I do not want to cut into the wiring. Does anyone know a good place to pick up a connection to not have to splice wires?
  7. Hi there, I just put an AFE Power Momentum HD cold air intake on my 2020 Sierra 2500 AT4 and since I did that I have a pop-up that says "Check Engine Air Filter System" every time that I start the truck. When I scroll on the info page to "Air Filter Life" option it says "Check System". Does anyone know how to disable the filter life so that I do not receive these? Thanks
  8. Similar to the 18" post, I want to see a thread with a 100% stock setup and what size tires you put on for 20" stock wheels only. This thread is not for leveling kits or aftermarket wheels. Post up some pictures! Let us know what size your tires are and what kind. I'm really only interested in doing very minor trimming if needed. My last truck I just had to zip tie the liner a little further back. Thanks! My current stock AT4
  9. I just bought a used 2021 AT4 with the 3.0 with about 3,800 miles. This is my first diesel but I have read a ton of documentation, forums and Facebook groups specific to the 3.0 Duramax. When I got the truck I scrolled through all of the information in the DIC. I noticed that the DEF gauge is a about a third full. I figured the previous owner may have done a lot of towing with it because at 3,800 miles it should not be that low. Am I correct in that assumption? Should I go ahead and fill it up or wait until the truck tells me to? How much do I fill it? Until full? Thanks!
  10. The ventilated seats, both driver and passenger don’t blow cold air. The blue lights come on when turning them on but no cool air from the seats. The seat heaters work fine. Any suggestions? Trying to keep from having to take the truck in to the dealership.
  11. Anyone put at4 wheels on a last gen model? I got a 16 Denali and there’s an abundance of 20in black at4 wheels for sale and was wondering how it’d look
  12. Forgive me if this question has been discussed but I could not find anything with a search. I have a 21 Trail Boss that I want to lift 4" for a total of 6" to fit 35's. I have been looking for awhile now at the available lifts specific to the Trail Boss and AT4 and have narrowed it down to two... The BDS 1805H strut spacer lift with UCA's. https://bds-suspension.com/product?kid=1805H And Rough Country 27550 with their Vertex damping adjustable coilovers. https://www.roughcountry.com/gm-suspension-lift-kit-27530c.html T
  13. Hi everyone, new to the forum here and haven't seem to be able to find an answer after searching. Purchased a 2020 1500 AT4 last summer(love the truck), and recently added the Firestone Ride-Rite kit to the rear(kit #2609). I also ordered the 2" spacer kit as recommended (kit #2366). I'm having a bit of a problem with the install and was wondering if anyone else has added rear air bags to their AT4, and did you end up using the spacer or were you fine without it? Problem is the air bags are slightly misaligned, and appear "under-inflated" with the spacer in
  14. I have a 2021 AT4 with a 3.0. I'm looking to upgrade my UCAs but I can't decide on a particular brand or type. I've looked at everything from BDS, Zone, Cognito, Readylift, etc. I have Bilstein 5100s coming in to go all around and plan on running the fronts at full 1.1" height. I'm not looking to raise anymore than that or I'd just go 4" kit. I talked myself out of a level kit after hearing about all the ball joint and CV issues. I plan to run at least 34s when my tires wear out. ( I run 295/55R20s right now) It's my daily driver and don't plan on plowing thru mud holes on the regu
  15. I just purchased 2021 Sierra at4, and I couldn’t find where to turn on the rain-sensing wiper. I live in pacific northwest, so rain-sensing wiper is a very handy to have. I had this feature on my previous cars, I assumed it should be standard on this truck at this price range as well. Does anyone know how to activate it? Also can I change the air conditioning temperature unit to centigrade without changing anything else? Like right know when I changed the unit to metric the speed also change to km/h.
  16. Hello everyone, On my 2020 GMC Sierra 2500HD Denali I did a hood air induction vent swap for a chrome vent cover and while I was at it I added Led RGB lights inside the vent taking care not to restrict the air flow. Has anyone else done any chrome or Led RGB mods? If so lets see them please.
  17. Hope this may help someone - 2021 GMC 1500 AT4 Carbon Pro 4Play Wheels ReadyLift 1.75" Leveling Kit I just purchased a 2021 GMC Sierra 1500 AT4. These are the parts I installed: 4Play Wheels - Model 4P08 - 22x10 -18 Offset Purchase 4 Hub-Centric Rings! Nitto Terra Grappler Tires - 305/45/r22 ReadyLift Leveling Kit 4Play Wheels - The -18 Offset is so incredibly close to the caliper hump but they clear. No spacers required. They look pretty good. They don't stick out excessively which my personal preference is slightly outside the fender but no wh
  18. Wat's Up Gents and Ladies. Just picked up my Brownstone metallic AT4 over the weekend. Fully loaded. Couple of questions hoping to find out if I can get any answers as it seems the salesman and dealer are conflicted. Here they are if you guys can answer: 1. Does the AT4 come with Adaptive Cruise Control (ACC)? The manual says available in LD model???? I have the AT4 Premium add on, the technology and safety add ons i.e; lane departure, blind spot detection, forward collision and emergency braking, etc. It does not appear that I do have it, as the symbol for activating it
  19. I have a 2020 GMC 2500 AT4 Duramax Diesel. Fuel economy is normally 18-20 mpg local and 21-25 mpg highway. I've noticed multiple times that if I completely fill the tank up, that my instantaneous fuel economy and average drop significantly. Instantaneously runs about 8-12 mpg and my average over the last 50 miles drops down to 11-13 mpg. Then suddenly after about 25-50 miles of driving, it will jump right back up to good fuel mileage. If I never completely fill the tank, this doesn't happen. Dealer says they've never heard of this, but I don't trust dealership feedback. Previously I had
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