GM 2" lift kit questions

Bgill · January 5, 2021

If they are eliminating this kit I wonder what the reasoning is? I think I'll wait it out a bit before proceeding. Could be an improved kit to follow.....or could be long term issues found with the original kit that need to be addressed before we'll see it available again. Anybody now for sure what's up? Seems odd they would drop a popular item so soon after introduction....

Edited January 5, 2021 by Bgill

JAshworth03 · January 5, 2021

This would suck if true.

I've been waffling back and forth on buying the GM lift for my 19' HC. My only hesitation is if any sensors or cameras need to be recalibrated and if so, if the dealer does that when they do the install (assuming I choose dealer for install).

newdude · January 5, 2021

84768243 is the active # as of July 1st 2020. No notice of discontinuation, it is listed as a ship direct part that will back order when ordered. A dealer can put an order in for one, just no ETA as to when the supplier will have stock.

Blee · January 5, 2021

17 minutes ago, newdude said:

84768243 is the active # as of July 1st 2020. No notice of discontinuation, it is listed as a ship direct part that will back order when ordered. A dealer can put an order in for one, just no ETA as to when the supplier will have stock.

Good to know. I have a friend that used to work at a dealer and he could look up part numbers for me. Hopefully I’ll be able to get one soon.

Bgill · January 5, 2021

33 minutes ago, JAshworth03 said:

This would suck if true.

I've been waffling back and forth on buying the GM lift for my 19' HC. My only hesitation is if any sensors or cameras need to be recalibrated and if so, if the dealer does that when they do the install (assuming I choose dealer for install).

I'm in the same boat as you. 2020 HC w/3.0 Duramax been waffling between the GM kit, Bilstein adjustable height shocks or waiting for the new BDS kit specific to my truck to be released and going w/a 4" lift. Keeping all the technology functioning properly is definitely a major consideration in the final decision I will need to make sometime soon....

ero2 · January 5, 2021

Not to thread high jack but if I want to level my 2020 Elevation but obviously not have any issues with the suspension/ball joints etc (or at least no issues I could have controlled), is the GM kit (84768243) the right one?

The dealer quoted me ~500 installed, headlights re aimed, alignment done, etc. Which sounded good considering I retain the factory warranty.

Blee · January 6, 2021

I just got an email saying my order was canceled. The kit is on “indefinite back order”. It might be time to look at other options.

redwngr · January 6, 2021

Pic of what's included:

https://www.chevrolet.com/performance-parts/vehicle-upgrades/new-silverado/suspension

Introducing the only 2-inch Suspension Lift designed, engineered, tested, and backed† by Chevrolet specifically for the All-New 2019 Silverado. Developed by the same vehicle-level engineers who built the truck, the system was tested under the same grueling conditions and will not void the New-Vehicle Limited Warranty.†

With separate systems for select 2WD and 4WD All-New 2019 Silverado models, each system features front and rear passive monotube dampers specifically tuned to the chassis, jounce bumpers, rear leaf spring spacers, and much more for fully integrated installation. A front camera reconfiguration† and an Electronic Power Steering calibration† is included so that all driver-assist systems continue to function seamlessly. Read the vehicle Owner’s Manual for important driver-assist system feature limitations and information. Expert installation by an authorized GM dealer is recommended.†

PART NO. 84629787 /2-inch Suspension Lift – 4WD

PART NO. 84629789 /2-inch Suspension Lift – 2WD

RWTJR · January 6, 2021

Any of these help?

https://www.gmpartsgarage.com/p-hot-deal-2-inch-gm-lift-kit-84629787-liftkit

https://www.gmpartsxperts.com/oem-parts/gm-performance-suspension-lift-trail-boss-4wd-84768243

https://www.gmpartscenter.net/oem-parts/gm-performance-suspension-lift-trail-boss-4wd-84768243

https://www.suburbanautoparts.com/oem-parts/gm-performance-suspension-lift-trail-boss-4wd-84768243?c=az0xJnE9ODQ2Mjk3ODc%3D

MRP · January 9, 2021

On 1/5/2021 at 10:07 AM, Blee said:

I saw it on a few websites this weekend. I tried to order one place and it said discontinued. I was able to order from another and it canceled the order yesterday. I did order from another GM outlet yesterday and so far it hasn’t been canceled. Maybe they’re a few still around. Someone at a dealer with access to parts might know more.

I have just lifted my 2019 elevation 2 inches using non GM lift kit. I used the Ready Lift 2.25 inch blocks in the rear and had a spacer machined out of aluminum for the bump stop. Used the Bilstein B8 5100 shocks for the AT4 right round. Still need to fit the front shocks as I have a 2 inch leveling kit in there at the moment. II wanted to lift the front a bit more (with the 5100 shocks you can go stock AT4 height or +.55 inch or +1.1 inch higher), but not sure about taking the front up more than the existing two inches (stock AT4 height) on the standard CV axles that the elevation came with.

MRP · January 9, 2021

I have just lifted my 2019 elevation 2 inches using non GM lift kit. I used the Ready Lift 2.25 inch blocks in the rear and had a spacer machined out of aluminum for the bump stop. Used the Bilstein B8 5100 shocks for the AT4 right round. Still need to fit the front shocks as I have a 2 inch leveling kit in there at the moment. II wanted to lift the front a bit more (with the 5100 shocks you can go stock AT4 height or +.55 inch or +1.1 inch higher), but not sure about taking the front up more than the existing two inches (stock AT4 height) on the standard CV axles that the elevation came with.

For info her is the spacer that I had made up for the rear bump the rear bump stop

Aluminium spacer block drawing.pdf

JAshworth03 · January 14, 2021

Anyone happen to have a pic of this on a High Country?

Even better if it has the 22" wheel option.

Curious and greedy!

RWTJR · January 14, 2021

On 1/3/2021 at 8:15 PM, lapoolboy said:

The included axles are longer.

I share your confusion, it seems to me that if the TB/AT4 trucks already have these longer axles, why can't we bolt in the "non-TB/AT4" Bilsteins that give 2" lift? The regular trucks can get the full 2" with the "short" axles, but the TB/AT4 can only get 1.1" lift with the longer axles. Makes no sense to me. Once the struts are out, the only thing left making it a TB/AT4 are the marginally longer axles.

This is how I understand it. TB/AT4 has the same stock upper control arms (UCAs), as the non-TB/AT4. The TB/AT4 lift, (factory or OEM aftermarket) has the extended axles, different shocks, etc. So that 2" lift is occurring within the limitation of the stock UCAs. If you add additional lift of any kind to the TB/AT4 you exceed the engineered limits of the UCA. The issue with added lift to the TB/AT4 isn't axle length it is the UCA.

In other words, the stock UCA has a tolerence of 0"-2" of lift. if you add and additional 1" lift to the 2" lift of the TB/AT4 you are effectively at a 3" lift and outside the UCA engineered limits.

JMHO

No expertise implied or expressed

Edited January 14, 2021 by RWTJR
Added the "In other words" in hope of clarification

lapoolboy · January 14, 2021

18 minutes ago, RWTJR said:

This is how I understand it. TB/AT4 has the same stock upper control arms (UCAs), as the non-TB/AT4. The TB/AT4 lift, (factory or OEM aftermarket) has the extended axles, different shocks, etc. So that 2" lift is occurring within the limitation of the stock UCAs. If you add additional lift of any kind to the TB/AT4 you exceed the engineered limits of the UCA. The issue with added lift to the TB/AT4 isn't axle length it is the UCA.

In other words, the stock UCA has a tolerence of 0"-2" of lift. if you add and additional 1" lift to the 2' lift of the TB/AT4 you are effectively at a 3" lift and outside the UCA engineered limits.

JMHO

No expertise implied or expressed

So can I install aftermarket UCAs and use the "non-Trailboss" Bilstein adjustable shocks to get the full 2" lift instead of the 1.1" max lift available with the TrailBoss-specific Bilsteins?

RWTJR · January 14, 2021

23 minutes ago, lapoolboy said:

So can I install aftermarket UCAs and use the "non-Trailboss" Bilstein adjustable shocks to get the full 2" lift instead of the 1.1" max lift available with the TrailBoss-specific Bilsteins?

No, it shouldn't work that way.

The non-TB/AT4 Bilstein shock 2" lift should effectively give you the same lift height suspension as you have now. As far as the "lifting" components on the TB/AT4 front suspension go, basically the only difference from the non-TB/AT4 is the shock length and spring perch location. The 2" of lift made by the non-TB/AT4 Bilstein is made by changing/adjusting the spring perch location to essentially the same position/lift equivalent as what you have on your current Ranchos, no net gain.

In other words, the non-TB/AT4 Bilstein adjustable shocks at 2'' would just give you the same 2" as your current TB/AT4 suspension setup. Your replacing 2" of lift with 2" of lift, so no additional lift.

BTW, UCAs have virtually nothing to do with 'lifting" the truck. They allow for space, movement and maintain proper suspension geometry. They are replaced at certain lift heights to allow space for movement and maintain proper geometry after the lift (oversimplification).

All measurement/lift numbers are approximate.

JMHO

No expertise implied or expressed.