2022 Duramax chassis changes.

[SilveradoRST]

Anyone know or have any insight on what chassis changes were made to allow for an increase of nearly 4000lbs for the ‘22 Duramax?

 

Is it a change to the boxed frame?   

[spizike9]

If I had to guess it’s nothing to do with the chassis but has to do with most likely cooling. 

[camjr]

I understand it's springs, cooling, and a 3.73 rear end.

[newdude]

21 hours ago, SilveradoRST said:

Anyone know or have any insight on what chassis changes were made to allow for an increase of nearly 4000lbs for the ‘22 Duramax?

 

Is it a change to the boxed frame?   

 

 

The frame is already boxed on T1.  1/2 ton frames have been boxed since 2007 with the GMT-900.

 

All they've done is add what they do with the gas powered NHT.  Higher capacity cooling, 3.73 gears, 9.76" axle, different springs and shocks.  The 10 speed does get a shift calibration tweak to it as well with the diesel.  

[SilveradoRST]

1 hour ago, newdude said:

 

 

The frame is already boxed on T1.  1/2 ton frames have been boxed since 2007 with the GMT-900.

 

All they've done is add what they do with the gas powered NHT.  Higher capacity cooling, 3.73 gears, 9.76" axle, different springs and shocks.  The 10 speed does get a shift calibration tweak to it as well with the diesel.  

Sorry, I wasn’t clear about the boxed frame, knew it’s been there for awhile.  
 

GM mentioned they made changes to the chassis to allow them to fit the Max Trailering package.  Apparently they weren’t able to do that before until the recent change.  Their press release mentions this and I think some YT video as well.  I’ll have to find it again.

 

 

Does chassis mean frame here?  If so, what were the changes to the frame?

 

Edit:  So here is another mention from Pickup Truck Plus SUV Talk, that GM had an issue with the chassis before that didn't allow for Max towing.

 

 

Edited September 16, 2021 by SilveradoRST

[newdude]

17 hours ago, SilveradoRST said:

Sorry, I wasn’t clear about the boxed frame, knew it’s been there for awhile.  
 

GM mentioned they made changes to the chassis to allow them to fit the Max Trailering package.  Apparently they weren’t able to do that before until the recent change.  Their press release mentions this and I think some YT video as well.  I’ll have to find it again.

 

 

Does chassis mean frame here?  If so, what were the changes to the frame?

 

Edit:  So here is another mention from Pickup Truck Plus SUV Talk, that GM had an issue with the chassis before that didn't allow for Max towing.

 

 

 

 

No frame changes.  What they probably have done is just repackage the cooling area with the updated front end so it can accommodate the added cooling with the I6 configuration. 

 

That was the issue with the 2020-2021 trucks was cooling flow.  GM knew that the diesel could tow more than 9300lbs when it launched, but they couldn't get more airflow in with that engine.  DPF is under the hood on the 3.0 trucks, not under the truck like the HDs, so engine compartment airflow is crucial.  

 

EDIT:  Here is the article with the engineer talking about heat reduction back in 2019 on the 3.0:

 

GM Looking To Upgrade Tow Ratings For Half-Ton Duramax Pickup Trucks (musclecarsandtrucks.com)

 

They must have figured something out but just waited until the refresh to drop the upgrades.  

Edited September 17, 2021 by newdude

[f8l vnm]

1 hour ago, newdude said:

 

 

No frame changes.  What they probably have done is just repackage the cooling area with the updated front end so it can accommodate the added cooling with the I6 configuration. 

 

That was the issue with the 2020-2021 trucks was cooling flow.  GM knew that the diesel could tow more than 9300lbs when it launched, but they couldn't get more airflow in with that engine.  DPF is under the hood on the 3.0 trucks, not under the truck like the HDs, so engine compartment airflow is crucial.  

Damn Newdude always dropping knowledge on us. Thanks for educating  us Newdude 

[newdude]

14 hours ago, f8l vnm said:

Damn Newdude always dropping knowledge on us. Thanks for educating  us Newdude 

 

 

Just retain useless info sometimes LOL.  I put the link above from the engineer back in 2019 talking about the heat issue they had to address.

[camjr]

18 hours ago, newdude said:

 

 

No frame changes.  What they probably have done is just repackage the cooling area with the updated front end so it can accommodate the added cooling with the I6 configuration. 

 

That was the issue with the 2020-2021 trucks was cooling flow.  GM knew that the diesel could tow more than 9300lbs when it launched, but they couldn't get more airflow in with that engine.  DPF is under the hood on the 3.0 trucks, not under the truck like the HDs, so engine compartment airflow is crucial.  

 

EDIT:  Here is the article with the engineer talking about heat reduction back in 2019 on the 3.0:

 

GM Looking To Upgrade Tow Ratings For Half-Ton Duramax Pickup Trucks (musclecarsandtrucks.com)

 

They must have figured something out but just waited until the refresh to drop the upgrades.  

 

Of all the research I did before purchasing my Duramax Sierra Elevation X31 in June 2021, I never ran across that linked article.  It did a great job of pulling everything together despite it being from a few years ago.  Thanks for sharing.