Jump to content

2020 AT4 - 2.5" BDS Lift & Fox Shocks

Supercup

By Supercup
in Modifications, Wheels & Tires

 Share

Recommended Posts

Supercup Enthusiast

Supercup

Posted
Posted

I have a 2020 AT4 Carbon Pro and added a BDS 2.5" lift kit with 2.5" Fox DSC coilover front shocks, Fox 2.0 rear shocks and 3" rear lift block (replacing factory block).  I had a 2019 AT4 Carbon Pro with Ready Lift SST 2" level kit and RL UCA's.   The look is similar, but the performance is in another league with the BDS kit.  Most significant improvement is the "angle" of the front axels - I have posted photos below of the RL level so you can see the angles at the CV boots, pretty extreme, versus the BDS lift kit with drop bracket, which leaves the axel   basically level - alllowing a lot more flexibility in articulation.  

 

Ride quailty is excellent, but it is stiffer than the stock Rancho momo tube shocks, which are quite plush.   The stock Ranchos are good for about 5 mph in any kind of offroad terrain, the BDS is much more compliant and offers far better offroad performance.  With the DSC adjustment of the front shocks I was able to smooth out the ride to be similar to stock, very comfortable, yet more composed and in control.  A litte more steering effort with the BDS as well - both on same wheel and tire package.

 

Only issue I ran into is I have 18" x 9'  Method NV wheels with 18 mm offset (5.75" backspacing) and they interfered with the BDS tie rod.  They worked ok with RL SST kit - but were very close to the upper UCA but worked.  In both cases the Method 18" x 9" NV's with -12 mm offset (4.5" of back spacing) would be a better choice.  I will switch to those once I am ready for larger tires, for now due to wheel issues I stayed with stock 275/65/18.  With RL SST kit there was maybe 5/8" of room to the tire, so very limited room for a larger tire, whiich 18mm offset wheels (stock 18's are 26mm).  The BDS kit has a ton of inborn room - a few inches or more, so no issues there.  With BDS and 18mm wheels slight rubbing when backing up at full lock. 

 

Here are some comparison photos.

 

2019 AT4 Carbon Pro - Ready Lift 2" Level

1195288232_DP1.thumb.JPG.0c75d35792b45a1ec4d5cde5206dfad4.JPG

 

2020 BDS 2.5" Lift Kit 

2112937791_2020AT4-TowMirrors.thumb.jpg.28bd71fee45efbeb03c187ca2d3ee0c2.jpg

 

2019 RL SST 2" Level - CV axel Angles - level ground 

IMG_8840.thumb.JPG.a07a57722c6527f062a5d102ac0e46c3.JPG

 

2020 BDS 2.5" lift Kit - CV axles "level" 

 

 

 

 

BDS.JPG

  • Like 2
  • Replies 35
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Supercup
Supercup

James    Here is photo on level ground - no trailer - there is some rake.   Other Information  Height - ground to top of shark fin on roof is 80.25" +/- and 88" to top of ante

Supercup
Supercup

I have a 2020 AT4 Carbon Pro and added a BDS 2.5" lift kit with 2.5" Fox DSC coilover front shocks, Fox 2.0 rear shocks and 3" rear lift block (replacing factory block).  I had a 2019 AT4 Carbon Pro w

Supercup
Supercup

Other Photos    2019 with Trailer    2020 with trailer - tow mirros and accessory cameras added - big plus - way more visibility and saftey when towing   BDS

Posted Images

Supercup Enthusiast

Supercup

Posted
  • Author
Posted

Other Photos 

 

2019 with Trailer 

1403036657_TruckTrailer-Day1-1.thumb.JPG.ad35b1f5431aa8d5eb9c7df4feff70a2.JPG

 

2020 with trailer - tow mirros and accessory cameras added - big plus - way more visibility and saftey when towing

649394741_2020AT4w-trailers.thumb.jpg.2703ef3e644cd0af3c16d84403f6d586.jpg

 

BDS Stuff

 740429055_BDS4.thumb.JPG.794e26b053f5cc858fdc030611bdde57.JPG

 

1765863746_BDS2.thumb.JPG.02ba8582dfbc333c085b5100bb7341d2.JPG

  • Like 2
James Morel Enthusiast

James Morel

Posted
Posted (edited)

Finally somebody did it.  I was wondering about the BDS 2.5" Kit.  I'm sold after looking at your setup.  You didnt post any pics of the BDS without the trailer.  Does it still have rake?  I'd like to keep the rake.

Edited by James Morel
  • Like 1
fortplainman Enthusiast

fortplainman

Posted
Posted

Sweet. I had a bds 6in lift on my 07 for 10 years before all the fox goodies were involved and loved it. This kit looks killer. Been thinking about a level on my at4, but if I have the rxtra coin this would be a good alternative. What size tire are you running now and thinking about changing to?

Sent from my SM-G965U using Tapatalk

  • Like 1
Supercup Enthusiast

Supercup

Posted
  • Author
Posted

I will try to get a pic on level ground without the trailer - there is a slight rake, but not much.

 

I went with 2.5" (4.5" overall) instead of the 4" (6" overall) as I trailer a lot and wanted to keep decent mileage and good trailering characteristics.   Seemed like the sweet spot.

 

Currently running 275/65/18 stock Goodyear Duratrac wheels.  With 2.5" lift I think 33/12/5/18's are as big as BDS recommends on 18's - you can go to 35's with 20's, but I don't want 20's.

 

 

  • Like 1
James Morel Enthusiast

James Morel

Posted
Posted

Yeah thats what i'm looking for.  Just a slight rake.  Im not really into the completely level look, especially when its squatting under load.

 

  • Like 2
Anakalypto Enthusiast

Anakalypto

Posted
Posted

I’m running the 4” BDS on an SLT (not AT4). Love it. The axles and CV angles are awesome, rides like a dream. Going to upgrade to coil overs in January.

It sits almost identical to the truck above.

200666f97bf7c8a62431e183065d13a5.jpg
e99eb2f62f163772b371645e80d46d8d.jpg


Sent from my iPhone using Tapatalk

  • Like 2
Supercup Enthusiast

Supercup

Posted
  • Author
Posted

Hi,

 

I am wondering if you got the large skid plate up front to go on, without removing the air dam?   Shop that installed my lift said on AT4 had to remove all the front air dam stuff and they did not recommend as if done, it created a lot of wind noise, that customers were not happy with.  So they gave me the skid, not on the truck.  

 

Can you take a picture of your front skid plate underneath and show how it was attached by the bumper - I like the look so am interested if you figure out how to install and keep the front airdam?   

 

 

Supercup Enthusiast

Supercup

Posted
  • Author
Posted

James 

 

Here is photo on level ground - no trailer - there is some rake.

 

Other Information 

Height - ground to top of shark fin on roof is 80.25" +/- and 88" to top of antenna with 275/65/18 tires - 2.5" BDS lift on top of 2" factory lift on AT4  - so figure you need 81" minimum to clear your gargage door or header

 

 

 

 

Truck Fox 2.JPG

  • Like 4
lapoolboy Senior Enthusiast

lapoolboy

Posted
Posted (edited)
1 hour ago, Supercup said:

James 

 

Here is photo on level ground - no trailer - there is some rake.

 

Other Information 

Height - ground to top of shark fin on roof is 80.25" +/- and 88" to top of antenna with 275/65/18 tires - 2.5" BDS lift on top of 2" factory lift on AT4  - so figure you need 81" minimum to clear your gargage door or header

 

 

 

 

Truck Fox 2.JPG

Your tires are just a tick over 32", right?

 

I am running stock-sized 275/60R20 (33") with the 2" GM Trailboss lift and 1.5" RC front leveling kit.  Top of sharkfin is currently 78.5" off the ground.

 

I'm wanting to do the 2.5" BDS like you and go up to a 35" tire.  So, if my math is correct, it should end up being 83" tall.  2.5" BDS + 2" height increase from going to 35's = 4.5" total height increase.

Edited by lapoolboy
Supercup Enthusiast

Supercup

Posted
  • Author
Posted

Specs for my tire are 32.3" tall - A BFG K02 35 x 12.5 x 20 - 34.5" tall so if all else is equal - you would be 2.2" taller than mine - so 80.25 + 2.2 = 82.45" +/- tall - when comparing to mine as is.   

 

So closer to 4" of total height increase over where you are now (82.45 - 78.5) 

JimZRyd Enthusiast

JimZRyd

Posted
Posted

In the process of having the BDS 2.5” on my 20 AT4 right now. Went by the shop this morning to check it out. Looks killer!  I went with 35/12.5’s on 20x10’s. Having a little problem with the front tires hitting the edge of the front bumper at the moment. Shop guy is planning to raise the coil overs a bit to gain the clearance needed. Might need a slightly larger rear block as well.  Can’t wait to get my beast back!

James Morel Enthusiast

James Morel

Posted
Posted
On 10/1/2020 at 3:28 PM, Supercup said:

James 

 

Here is photo on level ground - no trailer - there is some rake.

 

Other Information 

Height - ground to top of shark fin on roof is 80.25" +/- and 88" to top of antenna with 275/65/18 tires - 2.5" BDS lift on top of 2" factory lift on AT4  - so figure you need 81" minimum to clear your gargage door or header

 

 

 

 

Truck Fox 2.JPG

Looks great! Perfect amount of rake. I think this is the route I will be going for sure. 

Jgreene11 Enthusiast

Jgreene11

Posted
Posted
On 10/3/2020 at 9:59 AM, JimZRyd said:

In the process of having the BDS 2.5” on my 20 AT4 right now. Went by the shop this morning to check it out. Looks killer!  I went with 35/12.5’s on 20x10’s. Having a little problem with the front tires hitting the edge of the front bumper at the moment. Shop guy is planning to raise the coil overs a bit to gain the clearance needed. Might need a slightly larger rear block as well.  Can’t wait to get my beast back!

Post pics please! Would love to see this. 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      I imagine the cold winters up here with repeated short runs in town every day for those that live and work in town and given what I have come to learn on this forum with DI engines having fuel dilution issues, and if they don't change the oil until it says to but keep driving it for a while, I bet all that is just lovely on those finicky lifters. 
    • teamjnz
      AWD conversion to Z71

      By teamjnz · Posted

      I just did some reading and Stabilitrak is more than a what I had originally thought. It is more of a vehicle control system to help the driver in precarious situations. I thought it was only the AWD system. Now I know. So I changed the title for this thread to AWD conversion to Z71 
    • teamjnz
      AWD conversion to Z71

      By teamjnz · Posted

      Sounds like converting will be a bigger endeavor than I was thinking. This truck doesn't have 2Hi like the Suburban did. The Tahoe has 4Hi and 4Lo and a button to turn of traction control.   From what I understand the Stabilitrak uses open diff in the front and rear. When wheel speed is not the same the stabilitrak uses the ABS system to slowdown the spinning wheel(s) to transfer power to the slower non-spinning wheel(s). I thought the transfer case was open too. Being able to transfer power either more to front or rear depending on wheel spin. Maybe I miss understood some information with you saying and power transfer is 50-50. Thanks
    • PunchT37
      OCI, not when but why?

      By PunchT37 · Posted

      My brother has a 2007 Avalanche with afm 5.3. It`s got 176,000 miles. Runs like a clock. Never been apart. Co worker has a 2010 Tahoe with afm 5.3. 230,000 miles. Never been apart. Runs like a clock. So, even though cyl deac is a weak spot, they can go the distance.   BUT, these engines had the oil changed regularly, AND had 5w30 as spec. I wonder if they would have lasted this far on 0w20? I`ll bet not.
    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      I certainly could be wrong but I hear of pickups far newer than that 2007 cutoff which may not be going to the wrecker but are having engine work done and be that a reman engine or new engine or trying to repair the existing engine. Some of it would be design issues as per the cylinder deactivation system that GM has and one of those lifters wiping out the cam and the question of oil changes moving the needle or not on that whole mess, or in the case of Ford pickup engines that have the long timing chains and wearing them out and the roller followers and phasers and some of that certainly goes back to oil change intervals. But in those various cases the truck has all sorts of life left in it and so the unfortunate owner and may be original owner or used market owner that is pouring money into repairs so the truck is not seeing the salvage yard yet but damage is happening by infrequent oil changes. A friends son had bought a 2018 I think it is half ton GM and it had some sort of extended or used dealer warranty on it and of course the lifter issue bites and its rattling and so the dealer had to swallow the bill and was at least 7000.00 and I think they only replaced what they felt they had to replace so yeah, I can see that being a ticking time bomb in the not too distant future. Would frequent oil changes cure all these engineering "marvels", probably not but some engine designs have shown that they do much better if the oil is changed a lot more often then if the manufacturer service claims are followed. New trucks cost so much that there is an incentive to keep the existing truck on the road by repairing. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...