jojo ma

Ok I have a 2020 3500 Diesel HD AT4, I have the stock tires on it now LT275/65R20. SO I also want to upgrade, saw the earlier post of the particular tire manufacturer recommendations. Here is my question for my particular truck if you guys can please help me out. I want the largest tire possible without cutting ( I will tolerate a small shaving though) just to get the bigger beefier tire. What are the recommendations for sizing? Also, Do I need to get the spare redone as well with a new similar tire? Or will original spare work until I get to my destination to buy a like tire for flat??? Thanks Gents, I appreciate the professional insight on these forums

I too have the same button and it does what you described. I spoke to someone knowledgeable at the dealer and they told me the HD do not have Adaptive Cruise Control? They said it was not good for towing? Not sure why that is as they can perform a cut off when trtailer attached. That is my only dissapointment. My GF has a aRaptor and the feature is damn cool and useful on long rides. You found out anything on your end?

Wow, great info. I have the 2020 3500 6.6 diesel AT4 and I live in south florida and I will be taking a trip to Utah and Colorado next year in June. I will be towing about 10K to 14K trailer and toys.....can't wait

Funny..my son said he was going to forward me a product..waiting to hear from him. Im in florida and just took mine to NC...bugs are nasty...i will update as i need a solution myself

No it does not have ACC, it seems a little confusing as you look at manual. But I realized and researched, it does not have.

2020 AT4 DURAMAX 3500, SINGLE AXLE, Bought in JAX Fl, drove it to south florida, got the same 20 mpg. I tow a single axle aluminum trailer with a Yamaha 2 seater sxs, (approx1800lbs with gear) just went to NC, got about 13-15 mpg towing!! way better than my silverado 5.3L gas 1500.

SEND LINK??????

Welcome..i too just bought a GMC 350p diesel...looking to toy haul myself. What are u hauling and what type of trailer u looking at?

Just saw this, I just bought the new 2020 Sierra 3500, Duramax AT4 single axle. I bought the extended warranty they offered from a company called Costguard www.protectiveassetprotection.com I purchased the highest coverage no deductible for $4300 for 150K miles 12 years bumper to bumper. I did a cursory search of company and they seem to be pretty good. It is transferrable and if I cancel they will prorate the difference back. Seem reasonable. This truck has alot of electronics and I do not want to have any issues, good piece of mind. Besides, I threw in the financing and over the 72 months it came out to be like $30 a month extra? (all depends on what amount you financed, I did $39K to include warranty). I bought mine out of Key Buick GMC in Jacksonville Fl. I found it suprising that the dealer has a lifetime warranty on the powertrain itself, lok below from the warranty website. BOTTOM LINE, I have bought cars with and without extended warranties, new and used. I swear by the warranties, I do not like spending money on expensive repairs that are costly. This AT4 is state of the art and has alot of electronics on board. For me seem worth the money. If I were you, look into this company, do your research and buy it for your new 3500, transferable and refundable...most of all piece of mind!! Hope this helps Plan Status: Active Purchase Price: $0.00 Additional Contract Owner: N/A Providing Dealership: KEY BUICK GMC 4660 SOUTHSIDE BLVD JACKSONVILLE, FLORIDA 32216 Coverage: LIFETIME POWERTRAIN WTY $200 DED Term: 999 Months / 999,000 Miles Effective Date: 05/29/2020 Effective Mileage: 25 Deductible: $200 Surcharge(s): N/A

That explains it...thx

I just bought a 2020 gmc 3500 AT4 ..I am trying to figure out if I have it??? It says LD model only?? I have been looking in manual however, it does not appear that I have? I spent over $70K fully loaded you would think this would be included????

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 (ACC) does not appear as I click thru instrument panel. 2. The emergency braking forward collision assist. How do I test this without rear ending someone....LOL 3. Also, they gave me at dealer looks like battery cables for a second battery? I would assume that it is for that, but it appears that I already have 2 batteries installed, one o the right side facing into engine from front and one on left looks like it is under fuse box? If not where would the other battery go? Other than that, I love this truck the best. I got loads of compliments on the truck as well as color. Hope someone could answer these questions I have. Thank you