GMC AT4 Chevy Trail Boss Lift Kits - ReadyLIFT

Available late August 2019
ReadyLIFT® customers have asked for it and we have delivered. Last fall we announced our new leveling and SST lift kit offerings for the all-new GM 1500 trucks. We specifically did not include the factory lift kit-equipped GMC AT4 and Chevy Silverado Trail Boss. The AT4/Trail Boss are factory equipped with a 2" front lift. This front lift includes a longer front shock/strut assembly. When combining a traditional leveling kit on these factory lifted trucks, several issues present themselves. These include binding issues with the factory control arm ball joint and contact issues with the lower strut/CV axle assembly.
ReadyLIFT prides itself in offering quality engineered products developed to perform properly on specific applications. Our engineers have completed the necessary research and development on the new AT4/Trail Boss, resulting in two exciting new kits designed to work specifically on these new factory lifted trucks.
First is the new 66-3921 1.75" leveling kit. Similar to our popular 66-3086 leveling kit for pre 2019 trucks, the 66-3921 leveling kit provides required amount of lift without causing conflict with the factory strut geometry and clearances. This leveling kit includes our popular tubular upper control arms with corrected ball joint cup angles, heavy-duty replaceable ball joints and out new Terrain Control Technology (TCT) maintenance-free pivot bushings with side-biter washers to improve alignment retention.
For those wanting a little more lift, we now offer a version of our popular 4" SST Lift Kit in a 2" lift version. The 69-3920 SST Lift Kit works with the factory 2" front lift. This kit includes a top mount strut spacer along with a pre-load spacer to limit droop and the same premium grade upper control arms now available in our 66-3921 leveling kit. OE style 3" tall cast iron rear lift blocks and rear bump stop extension cups are also included to create a true AT4/Trail Boss-specific bolt-on lift kit that provides 2" of front lift and 1" of rear lift. This new lift kit concept is similar to our successful TRD Pro Plus 2 SST Lift Kit which is also engineered specifically for the factory suspension lift.
Your trust in ReadyLIFT to provide high-quality, precision engineered products is extremely important to us. You can be assured that these all-new leveling, SST lift kits are the absolute safest and best performing suspension upgrade option for the AT4/Trail Boss trucks.
For more information please visit www.readylift.com

[@Aldo-rm9mr]

Who else doesn't know anything about lifts and other car mods? I just buy what my eyes are attracted to

[@e90steez]

Did the SST 2.0 and was able to fit 35x12.5 on my trail boss, did minor trimming to the mud flap and removed the metal bracket behind the mud flap. No rubbing issues at all. So far the truck is riding well!

[@american_chevy616]

I Bought the BDS 4in suspension kit, but I havent seen nobody seen people put a video on this issue yet. And for that I thank you.

[@canamxmr4760]

Can you make an actual replacement strut? The ride is so stiff with the preload spacer.

[@apr9286]

Is there a 4" kit for trucks with the 3.0L duramax?

[@BROWNANDGIFTED]

So will this now make the 2020 AT4 a total of a 4 inch lift? I ended up running 285 60 20 ridgegrapplers on mine with this sst kit. Could I have gone bigger?

[@mitchellventrone400]

No you would need a true 4 inch lift from BDS or Zone to get to a 6 inch lift total.

[@fernandomurillo9272]

Thanks for information I have 2021 trail boss. I’ve been watching at other u tubes you guys gave me more info about what to look 👀 for

[@fasterforward4699]

It's been a year and a half...is there an update to this video? Did the products come out? Not sure if only the first version still avail om your website. I'm concerned with ball joint rubbing 295/65 tires on factory rims.

[@user-vf2dz9il4i]

When will the plus 2 leveling kit be confirmed to fit the 2024 Trail Boss

[@BrandoOwnage]

What size tires, rim and offset are the wheels in the opening video on the black at4? Thanks

[@carlosfigueroa7616]

So to add a 2" level on my trail boss I have to change the upper control arms and I'm good to go right?

[@moosc]

So no simple way to level the front of an at4?

[@delatia6128]

I have a gmc 1500 at4 2021, I want put 35’s. What lift I need?

[@tko6196]

Do these guys answer any questions...

[@Boobtube.]

nope

[@huntdacntry]

I’m ready to order a SST lift for a Trail Boss. I’m tired of seeing that thing down 2” in the front. Can I pre order?

[@MAXXHEADDRUMZ]

Quinn Allen so right, it drives me crazy

[@someguy9588]

What wheels, tires are they using at the beginning of the video?

[@vincentperpetua5384]

Does anyone know if you can fit 33x12.5r20 tires under the 1.75 level kit without cutting or rubbing?

[@winchestermodel7044]

Yes you can.

[@kasmenmonrose3481]

Has anyone had issues with cv boots leaking past the clamps with a ready lift level kit on a 2020 trailboss?

[@ericbuchta9765]

Looks over function? How can we get more travel. Anyone can make a spacer.

[@04GTIVR6]

So will the Factory 18” work with this lift??

[@ensoalvarado9971]

No 20s and beyond

[@JeffBunkinator]

Stock 18" Trailboss rims are compatible with the leveling kit? and Will the 2020 leveling kit be out soon?

[@yengmoua6879]

Dan, how about a little discount for old time sake...

[@AHA-hh4bm]

I’ve seen where some people that have the 4 inch sst lift on their 2019 have issues with the CV’s messing up. Can you explain?

[@collisiontech_nick399]

AHA 1987 apparently no they can’t. I wanted to buy the lift but I can’t do it knowing the problems it brings unless it was updated to fix those problems

[@kaizenlife1152]

The angle is putting to much pressure on the cv’s.

[@nicke2307]

Can you shave the bolt a bit to create clearance for the cv boot?

[@ChrisFowlerRacing]

Can you upgrade the suspension with this setup?

[@83ederibeiro]

The factory 18" will work with this lift?fits the 2020

[@pyrorye-80]

Does anyone make a leveling kit for the 2020 at4 that retains the factory wheels? Absolutely stupid to have to spend thoudands on after market wheels just to level the truck. Poor design

[@wyattmckinnon2478]

Curious about upgrading suspension with this in terms of a coil over kit I can put on my new AT4

[@beanpole713]

Wondering this too. Have you found out anything?

[@Revenge7zero]

I’m fixing to purchase mine and have it put on my 2019 GMC Sierrra AT4

[@markdangerfield9227]

Revenge7zero 🇺🇸 Yes I like the way you did it so keep it going because I am subscribing on every channel that you got OK so keep those GMC trucks going

[@03anro13]

Hi guys, I drive a 2011 chevy 3500 crew cab diesel 8' bed and with a 4" lift. I'd like to take care if the rust underneath and a new 6" lift with front and rear custom bumpers. Would u guys do that? And how much it will cost?

[@KozmoKraemer]

Had a readyLift Dealer try to purchase this, its still 2-3 weeks out from being able to buy :(

[@carsonnguyen4423]

Scott Kraemer which kits are you trying to buy ? I didn’t understand if they were saying the factory lift from gmc is not safe or they were saying getting a leveling kit for the factory lifted AT4 was a bad idea...

[@elchingonchingon2332]

We're are you located?

[@rocoroco5749]

I haven driven a new AT4 and with magnetic ride control it drives Amazing. my question is i realy dont think its going to ride the same if u level or lift it

[@mitchellventrone400]

the AT4 doesn't come with mag ride buddy

[@jayrolfes9392]

What size are the wheels? What offset?

[@Mark-ch5bb]

Stock AT4 with 18" factory wheel package. Will this leveling kit work? They show the max size allowable on their web site.

[@GIUSEPPE18ROSSITTO]

Mark Rybicki at Custom Offsets I was told that you would need to change your stock 18”s to 20” wheels.

[@1613ckhris]

That’s great and all but you do nothing for the horrid CV angles when you basically stack leveling kits. Never stack leveling kits if you plan on off-roading.

[@kegacy]

With the plus two, what size tires are fitting without rub on the stock 18s?

[@fasterforward4699]

i put 295/70/18 Toyo tires on with no rub

[@fasterforward4699]

wish it were a true levelling kit tough. still have a rake.

[@e90steez]

I run 35x12.5 on 17x9 -12 on my trail boss with the SST 2.0, it fits but I did some trimming to the mud flap and took out a metal bracket behind the mud flap. I know it’s this a late reply but hope that helps!

[@johnoceanyang5522]

Why no one make a video about rear lift. Front too easy everyone keep boring video front lift. But 👍 video

[@bmanj5435]

Does anybody know if they make a true 2 inch lift I don't want to level just the front I would still like the back of the truck set up higher than the front

[@adriancardona4202]

Will you still be able to use 4hi on the at4?

[@ataylorb16]

Late comment but yes, 4hi and 4lo is okay to use, 4auto isn't recommended though

[@caseyhatcher4726]

A company in Lexington KY installed your 66-3920 on my 2021 Chevrolet LT Trailboss and the front passenger side tire completely ripped off my truck while driving a week ago. The company is stating that you guys have not updated your vendors that the 66-3920 is not compatible with the Trailboss and they are not taking any responsibility for their install. I have spoke with 2 employees from your company but I would love to speak with someone in upper management to gather some more information. My insurance has denied the claim, the company has denied their wrongdoing and I am forced to take legal action to get my truck fixed. The are threatening to name your company and their vendors in the lawsuit... huge mess.

[@englandboys5132]

Hey man, just curious if you got your issue resolved? This happened to me today…. Driving on the highway and my driver side tire came off. But instead I’m trying to get GM to cover it since it’s still under bumper to bumper.

[@BigLou19]

How fast were you going? I hope all Is ok. Would you say the other leveling kit “ Readylift 1.75” “ would of been a better choice ? Now I am worried! Thanks in advance. 🙏🏼

[@englandboys5132]

@@BigLou19 I was going 65mph. Luckily I didn’t crash or anything. Yes the new leveling kit I got is specifically made for the AT4

[@BigLou19]

@@englandboys5132 Man! Im glad all is good bro. 65mph is pretty fast! 😮😬 I spent hours reading reviews on these level kits and reading peoples comments on all these KZbin post and I found 2 people that their wheel still fell off with the readylift level kit. 😨😨😳 One of them is suing and the other who knows. I will find it and tag you if it’s possible.

[@caseyhatcher4726]

@@englandboys5132 unfortunately it ended up costing me close to 11K....not covered under warranty because the leveling kit is what caused the damage. I did file a lawsuit against the company who installed the leveling kit because that specific kit is not made for the TB and the vendors that I called stated the company should have know this and never installed.

[@mauriceharris6925]

When will this be available for purchase

[@anthony2558]

Now

[@marc-andrenoel1799]

is it dangerous for gimbals

[@reddesertoffroad]

Recommending wheel spacers... just wow Ready Lift. SMH Wheel adapters yes, spacers never... they are illegal in some states for a reason.

[@ReadyLIFTVideoPortal]

Take it up with GM. Very very few wheels would clear the caliper when these trucks came out. The 6mm spacer provides a clearance option for aftermarket wheels.

[@reddesertoffroad]

Yet at least here in Utah, illegal.

[@insteg8]

Pre orders??? Price point??

[@Kinovwperformance]

insteg8 over $500 since it includes control arms.

[@Kinovwperformance]

Actually the level will start at $499. And the lift will be a slightly more expensive since it has a few extra parts.

[@tanner6112]

there's obviously no marketing department @ readylift - they would of never released this video lol

[@ReadyLIFTVideoPortal]

Why do you say that?

[@danh2492]

@@ReadyLIFTVideoPortal These are the best people to represent your company...HAHAHA!!! Pretty rough!

[@CMAC83]

Stay away from rough country kits. They maybe cheaper. But there Chevy and GM kits will ruin your vehicle. Do it right the first time go with this company.

[@andrewnewcomb413]

Explain. Otherwise it just seems that you're projecting your opinion to people who may listen to you. Rough country is a good company so I'm curious to know how it'll destroy a vehicle. Additionally, I've ran Rough country for years, so your argument will be tough.

[@fallosantis569]

a lot of mumbo jumbo ... not clear what they saying

[@ReadyLIFTVideoPortal]

Turn up your volume. It’s very clear 😎