Supercup

Rear did not settle - just blocks - so no settling - front did settle 0.25" or so. I agree - like the way yours sits - looks great!

I have 2019 AT4 - also did Ready Lift SST kit - front was at 38" (both sides) before, now right at 40" (started at 40.5", but has settled about a 0.25" since). Rear was 40" - now rear at 41" with rear blocks addded and Method NV wheels, so still a slight rake - without the block it was about 0.25" high in the front (but looked dead level with stock wheels). I have painted fender flair from GM (not plasstic one like you). Maybe they did not property set the preload, with spacer from SST kit - that should add the full 2", if preload was set correct. May have that looked at. Photos below - is first photo after front level with stock wheels - no rear blocks - second is how it sits now with Methods and rear blocks added and third is the truck in stock form Methods and Blocks added to rear: AT4 Stock - before SST Kit added

Thanks for this - great resource!!!

Glad to hear it, the truck I drove was a 4WD GMC Sierra (dealer loaner) with Rancho shocks and 22's like yours. I was suprised at how poorly it road in comparison to my AT4. The Rancho shocks the TB and AT4 have are not the same as the Z/71. The TB/AT4 have monotube Ranchos's vs the Z/71 having twin tube Ranchos. You can read more about differences on the link below: Link: https://www.strutmasters.com/the-difference-between-twin-tube-and-monotube-shocks/ Enjoy your ride!

You are not missing a thing - no drop brackets with 4" lift, you will have bad cv axel geometry - potential for issues exists - user beware! Whatever you do don't "shift on the fly" into or out of 4WD (per Ready Lift in phone conversation).

Truck looks good! But be clear you won't have issus, so long as the dealer who installed it backs it up. GM will not back it up, they will push it off to the dealer who installed it. As long as you are comfortable with that, you are good to go. from my discussion with Ready Lift - their primary concern is the torque put down when "shifting on the fly" at speed - the other issue is, if you go offroad and are in 4WD the geometry is off, so if you have extreme articulation, we may suffer issues. Do you have any idea how much those tires with 22's weigh vs stock - I drove one with same 22's and the ride was compromised to what I have quite a bit. I picked a 22" wheel up in the part department and I was surprised what a lead brick it was, sucker was heavy - that will put further load on your cv axels under off road conditions.

The issue is the angle of the cv axel is out of OEM spec range and it puts added torque on the unit. 2" of lift is about the max you can lift, without lowering the diff to keep the factory geometry in line - so for a normal truck a level kit is fine - goes from stock to 2" - Problem for the AT4 and Trail Boss, is they go from 2" of factory lift + 2" of level - so 4" of lift with level kit - so now too much angle on cv axels. - Ready Lift had complaints about loud grinding noises when shifting into auto 4wd on the fly - and there is a post on this forum from someone who shifted into auto 4wd on the fly and heard all kinds of bad noised - limped to the dealer and dealer had to replace, no warranty due to 2" of added lift for ready lift level kit. That is why all the 4" and 6" lift kits you see, have brackets to lower the front diff, to maintain the geometry angles of the cv axels into the front diff. If you look at the last photo in my prior post - you can see the cv axel in the background and see the angle up and down at both ends is pretty extreme for the truck being level on the ground. Had I known this, I would have not done this kit, which is a nice kit - good quality - just has this issue for AT4 and TB that is not good. My truck is leased, have 2 more years, so I am debating if I go with correct level or just leave as is and roll the dice. I have used my truck offroad in 4WD high and had no issues, but it will always be in the back of my mind.

You can probably fit a 285 or 295 tire - I would go to your local tire guy and see what they think. truck will look great with level! check out this thread for tire size and trimming information - good info.

You can probably fit a 285 or 295 tire - I would go to your local tire guy and see what they think. truck will look great with level!

Here is a photo of my truck with stock wheels and then with Methods (same 9x18 and same offset as stock) - after leveled.

I have the same lift - I stayed with 275/65/18 Duratrak wranglers that came on truck - but swapped out wheels to Method. Be aware that Ready Lift does not recommend you use auto 4WD with this level kit - from website "NOTE: Use of Auto 4 HI feature not recommended" - due to having customers who have damaged their front diff using it. they say you can fit "AT4 - Max tire 305/55-20, 20x9 0 offset wheelTrail Boss - Max tire 295/65-20, 20x9 0 offset wheel" As you can see they make no statements for 18" wheels - here are some photos of clearance to my upper control arm - about a finger width - so you can't go much wider than 275, without getting a spacer or wheels with different offset than stock. Note in my last photo the angle of cv axel - not ideal. Do a search on AT4 and TB and there a lot of threads on this topic and many have gone larger - but the wheel well is tight and the spacing as well to the upper control arm.

My 2019 Carbon Pro AT4 kicks in at 98 mph - very annoying! Well below the tire rating - but I guess they dock you another 8 mph for the 2" lift!

Here is my truck - leveled with Ready LIft SST kit, when it first when on (bottom pic and the after I added wheels - stayed with stock tires for now. SST kit comes with 0.5" taller block for rear to made it fully level.

They have two options at half the cost with alternate shocks - the mid package with the Fox 2.0, not piggyback shock is a nice middle ground. I did Ready Lift SST kit - did not pay attention to their note you are "not recommended to use 4WD auto" I paid more attention to it after talking to someone who toasted the front diff, due to shifting into auto 4WD on the fly - no warranty coverage - so if you are going to use your truck "offroad" or want the benefit of auto 4WD - then you need to go with a kit that lowers the diff to protect the factory geometry. Had I done more homework I would have gone with BDS right away to fully address the problem - plus you get some added skid plates and stronger overall connections - so the kit improves your truck on every aspect - where the "level" kits simply level your truck and may compromise your truck long term for wear on CV axels. You get what you pay for here. Here are the base BDS options - that are not $4k and a you tube video showing differnt shock options. $2K with Fox 2.0 - $1.8K with NX shocks (similar to Rancho). BDS with Fox 2.0 front shocks ($2k): https://bds-suspension.com/product?ma=5&mo=1&ty=113&yr=2019-2020&kid=749H Shock Options BDS:

I have 2019 AT4 Carbon Pro - came with same speakers- also very disappointed with the sound - mine also has already been replaced under warranty (6 months in). If the speakers can be replaced - might also need to upgrate amp - would be very interested to see how much better it would sound with improved speakers. Looking on cruthfield there are a lot of a marine grade option that might fit. Let us know if you take apart to see if you can swap speakers out. Concept is good - sound is really poor - especially when you can buy a wireless speaker that is 12" in size that sounds 10 times better for 1/4 the cost - that offers all the same features and you can use it more than just next to your truck. I would not recommend anyone add this to their truck or pay the $800 option cost to GM for this system from a dealer - it is a dealer installed item - so they can take it out and you can save yourself $800 - get a few quaility wireless speakers, better flexibility and better quality sound! But if you want the convience of it you can buy at shop Chevy parts for $559 - Link: https://www.shopchevyparts.com/electronics/2019-sierra-1500-multipro-tailgate-audio-system-kickerreg/19417163-p-92303047.html

Sorry for late reply - haven't been on lately - I would do it again - 15 hp from the combined package - 3 hp from the OEM CIA - so not much of a power gain - change in noise is minimal - but you get better flow and it looks a lot better when you open the hood. I would do it again - not really needed (performance package) - but why not, every little bit helps and OEM mean no warranty issues.

I have 4,806 miles on my 2019 AT4 - average from day 1 is 14.2 MPG - I have attached 4 photos - trip 2 - which I have not reset since new, trip 1, which is mix of street and freeway driving. 50 mi - screen showing last 50 miles and then showing what that looks like when switched ot the last 400 miles, as you can see big change from 50-400 - bringing me closer to my "overall" average of 14.2 mpg. Driving has been a mix of around town and trips to the lake - i don't comute in it, gas tank is just to small, as I drive 150 miles 4 days a week. I drive faster than most on freeway and get up to speed quickly getting on. Around town I drive respectfully - so easier on the pedal. Overall I am fine with 14.2 given how I drive - was hoping for 15+. I had a 2014 Raptor with 6.2 before and I got 12-14 mpg pending on driving conditions and 13.1 mpg over 88,000 miles. Most of the miles were commuting from OC to San Diego, 4 days per week and driving to desert and lake. I replaced the stock 36 gallon tank with a transfer flow 50 gallon tank - which was great (link:https://www.transferflow.com/shop/replacement-fuel-tanks ), wish they would make a big tank for our trucks When gas is $4 per gallon i figured i was cheaper to have a Golf R for commuting and truck for the weekends gas savings were greater than the added cost of the R. Now with gas at $2.75 for 91, I will drive the the truck more... As I get more miles I expect i will see better mileage - if you are looking for mileage - V8 trucks are not the way to go! I have stock tires, with level kit for front so the lift does not help either.

Tried and True 8 speed was "discontinued " after a few short years - 10 speeds are latest and greatest - time will tell - but mine has been great. One man's junk is another man's treasure!

I would say that it was tried and discontinued. Most 8 speeds worked just fine, just like the 10 speeds. The 10 speed is a better platform with newest engineering - mine is fantastic - but one man's junk is another man's treasure!

I have a 19 AT4 6.2 - 10 spd - 8,500 miles - not a single issue - in fact the tranny is one of the best overall things about this truck - it shifts smooth and has been absolutly seemless! Hope they find a fix for you and you get back to enjoying your truck!

Wish I had done a bit more research before I bought the RL level kit - paid $505 to tire rack for SST kit and a few hundred to have it installed - had I known what I now know I would have spent extra dollars for BDS lift. So now I have to decide if I want to return the lift kit to RL and eat the cost and get BDS installed or go back to stock? If the truck was not leased, I wouldn't even think twice and would go BDS, but with 26 months left on lease, not sure if I want to do all that versus just going back to stock? Buyer beware when you mod !

You are correct - For AT4 and Trail Boss - SST kit is 2" level - for standard truck the 2" level kit - is not the SST and does not have the note - but the 4" SST kit for the standard truck - has the same note - "don't recommend use of Auto 4Hi" - My point was the issue seems to be based on 4" of lift or more over stock height of standard truck - which is 2" over AT4/trailboss. Clear at mud?

I have the ready lift SST kit installed in my AT4 - they have a note for this kit - "they don't recommend use of auto 4wd with level kit" - so if you go this route you "should not" use the auto 4wd feature. This is only the case for the AT4 and TB SST kit - that level 2" - do 4" overall (2" from factory and 2" from level so 4" overall). The standard truck 2" level kit does not have this issue, but the 4" SST level kit for the standard trucks do have this same note - "do not recommend use of Auto 4Hi with this kit" - so the issues is going from 2" to 4" - not from standard truck height to 2" I spoke with ready lift and they indicated that some customers have reported a problem when shifting into auto 4wd on the fly, having a loud noise or rumble from the front diff area. They are concerned that the torque put on the front diff when shifting on the fly exceed mfg spec without the added lift and could result in damage. So going to 4" of lift must be putting some components out of OEM speck alignment. If that is true - it shoudl appy to any lift or level kit that is 4" or more. for now with ready lift level kits for AT4 and Trail Boss - using auto 4WD is at your peril - so that begs the question for me, was this the right route to have gone? Another poster on another thread here took the kit off and got a refund from readylift for the kit after having an issue. For me I am leaving it on for now and will not use auto 4wd with is no big deal in so cal. I plan to talk to BDS about this issue on their 2.5" and 4" lift kits and see if they have the same concerns or if they have designed around this apparent issue created by the level lift on the AT4 and TB. Looking for an all around solution, that does not negate a nice feature of the truck - e.g. auto 4Hi .

You are right they do for 2020 - but for the 500 they made late in 2019 we did not get black badges or black exhaust tips - I have ordered to put on as I think it looks better!