I thought that I saw somewhere that current production didn't have a higher tow rating because of the cooling system... needs a bigger one to pull more.
"Another big criticism for the 2019 model was the low towing capacity for the 3.0-liter Duramax diesel. Chevy says they were able to make changes to the frame, increase the rear differential to 3.73 (from 3.23) and improve the cooling to allow trucks with this engine to add the maximum towing package. This improves the maximum tow rating to 13,300 pounds in a 2WD model. This is a huge improvement resulting in 4,000 pounds of towing more than the prior generation."
Yeah, they went to a 3.73. rear end. I wonder the the e-lockers will be available outside the ZR-2 trim? It looks like they upped the size of the 'punkins, so I doubt a retrofit is possible on earlier models
I believe the 13,000+ lbs trailering is tied to the NHT max tow package. This package you get the 3.73 rear end along with stiffer rear leaf spring and unique shock tuning. The NHT package is only tied to certain tires.
The non-NHT trucks will still have the 3.23. GM needs all FE they can get. They are funding Telsa with buying credits from them.
An axle ratio change can help powertrain cooling sometimes. When you test at Davis dam or stovepipe wells, a higher rear end ratio can have you maintain a higher vehicle at a lower rpm (you could be in a higher transmission gear). At a higher vehicle speed and lower engine speed, you get more airflow and less heat rejection. This keeps the fluids cooler without needing changes to cooling system.
Doesn’t shock me, my 21 pulls 12k easy even up a steep grade, didn’t do it on purpose internet police, gravel yard overloaded my dump trailer. I think GM downplayed the numbers for some reason on the 20-21’s.
The 2021's got a paper upgrade as engineers found out the rear end gears held up much better than expected. It was a modest increase. The 22's have updated chassis and cooling, along with lower final drive ratios to see the big bump in capacity.
I think I read it some months ago on the GM website. They basically looked at run data and concluded they could nudge the max towing a bit based on the info. Try searching GMauthority.com
Order sheets show only a 100 pound bump in GVWR. So no real payload increases given the weight of the NHT package. Will there much of a MPG hit with the NHT package? I've watched some videos, and looks like RPMs are around 1500 at 70 mph. So with the NHT, it will be around 1730 RPMs at 70 mph.
Debating on whether to order with NHT LM2 package or not. The stiffer shocks and springs sounds good. I'll never tow over 10000 pounds (dump trailer), and majority of my towing is a 5000 pound (loaded) enclosed snowmobile trailer.
Order guide shows NHT / LM2 will only be available on SLE/Elevation/SLT on the sierra's and 3.73 will only come with the LM2/NHT combo.
Silverado NHT / LM2 /3.73 package will be available on LT/RST/LTZ/HC.
Gas engine chev with NHT will get 3.42
NHT cannot be added to HC if the truck has the optional adaptive ride control.
NHT not available with 22's or with the 'off-road' packages
Order guide shows NHT / LM2 will only be available on SLE/Elevation/SLT on the sierra's and 3.73 will only come with the LM2/NHT combo.
Silverado NHT / LM2 /3.73 package will be available on LT/RST/LTZ/HC.
Gas engine chev with NHT will get 3.42
NHT cannot be added to HC if the truck has the optional adaptive ride control.
NHT not available with 22's or with the 'off-road' packages
13,XXX is great but they don't have any payload so it's kinda pointless, so the 2500 still is the best option really.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Chevy and GMC Duramax Diesel Forum
3.8M posts
207K members
Since 2005
A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more!