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GMC 1500 Duramax

GMC 1500 Duramax

Postby TDU88 [OP] » Jul 25 2020, 3:37am

I just traded in my 2017 1500 Silverado Z71 and purchased the new GMC 1500 Duramax. I am very impressed with the powertrain from the shifting, power, and the fuel mileage. I am averaging about 25 MPG (both highway and city) and it not only shifts way smoother but overall feels more powerful. Even though the Duramax is a upgraded costs but it does come with a 100,000 mile powertrain warranty and will holds it value in the long run. It may not be for everyone but I have ran the numbers with how much I drive and its well worth the money.
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Re: GMC 1500 Duramax

Postby Tatsngats » Jul 25 2020, 5:58am

What’s the tow rating and payload capacity of these new 1500 Duramax’s?
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Re: GMC 1500 Duramax

Postby racermd » Jul 26 2020, 6:56am

Tatsngats wrote:What’s the tow rating and payload capacity of these new 1500 Duramax’s?


Thankfully, there's a handy sticker in the driver's side door frame with all the relevant numbers already calculated on each truck so you don't have to break out the pocket calculator. GM has been doing this on all the newer trucks so you can easily use it when shopping for a new truck. It'll be different for every cab, bed, and equipment combo but... On my LM2-equipped 2020 LTZ Crew-Cab w/ Standard (6.5') box I have (all in lbs):

VEHICLE:
GVWR: 7200
GCWR: 15000
RGAWR: 3800
Curb Weight: 5613
Max Payload: 1587

TRAILER:
Max Conventional: 9200
Max Tongue: 920
Gooseneck: 7100
Max Tongue: 1065

As you'd expect, Max Conventional trailer rating is calculated out of the GCWR minus the Curb Weight. That leaves about 187 lbs discrepancy in my particular case which is close to what an "average" adult male would be in the driver's seat.

Also, it's known that the tow ratings are down from the competition - even from GM's gas-engine siblings - but it's apparently due to the under-hood heat loads from the unique packaging of the turbo and SCR/DPF systems on the LM2. All of those hot exhaust components are bundled very close to the engine to help get those components up to operating temps quicker as well as simplify installation packaging at the factory. If/when GM can sort out how to get temps under better control under the hood, they may increase the tow rating on trucks with the LM2 in the future.

That said, my personal limit for towing with a half-ton is about 8k lbs. If you're pulling more than that regularly, you're going to find the 3/4-ton trucks handle the job a LOT better. If it's only an occasional load - probably no more than twice/year - and you're still not sure a 3/4-ton truck is the right fit for you, a properly equipped half-ton will do the job (just don't exceed any of the weights on the sticker). Be aware that you're pushing the limits on what the half-ton is going to be capable of and may feel sketchy in certain situations like passing semis on the freeway.

At the risk of opening a can of worms, what I find weird (silly, even) is that GM went to the effort to give us gooseneck trailer rating numbers for a half-ton pickup and they're DOWN from the conventional tow numbers. Who, exactly, is towing a gooseneck with a half-ton pickup? The lightest gooseneck trailer I could find is a Featherlite car trailer model 3112 at 20' which weighs 2600 lbs. The trailer has a pair of axles rated for 5200 lbs each (total of 10,400 lbs) leaving 7800 lbs for cargo. But the max rating on my sticker minus the weight of the trailer itself means I'd only be able to utilize 4600 lbs for trailer cargo. That's 3200 lbs of trailer capacity completely unused thanks to the limits from my tow vehicle. Who would do such a thing?! I'd be better off with, for example, the bumper-pull Featherlite 3110 at 14'. That one has a pair of axles rated for 3500 lbs each (total of 7k) and weighs a paltry 1300 lbs. And since that 7k lbs trailer rating is well under the 9200 lbs conventional limit on my truck, that leaves the entire 5700 lbs remainder for cargo - 1100 lbs MORE than the larger, theoretically-more-capable gooseneck! Goes to show how ridiculous the gooseneck option is on a half-ton truck.
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Re: GMC 1500 Duramax

Postby swervin36 » Jul 27 2020, 6:27am

I think that when anyone hears "DIESEL" they think about towing capacity. Most of us 1/2T guys to occasionally tow but we also drive these things back and forth to work and grocery runs. I have two Harley Cruisers and a flat bed trailer, trailer weight loaded is about 4000lbs. A 1/2T is plenty for my needs. What gets me is people want to tow 8-12k lbs with a 1/2T truck. That is just crazy to me. If I was regularly towing 7 to 8k I would have bought a 3/4T. Larger motor, better brakes and just beefier all the way around. Always get the right tool for the job.
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Re: GMC 1500 Duramax

Postby Diesel-One » Jul 31 2020, 3:25pm

I've seen plenty of 1/2 tons pulling 5th wheels, particularly F150's. They're giving you those numbers because a lot of the manufactures are marketing 5th wheels as 1/2 ton towables. https://www.rvingknowhow.com/half-ton-t ... th-wheels/

The Escape 5.0 is the only one in this article that is realistically in our range. https://escapetrailer.com/the-5-0-escape/

On Winnebago's forum a couple with a GMC Canyon 2.8 diesel are towing this trailer and had been for a couple years. They're definitely overweight on this.

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Model 2405RG

Exterior Length 26'9"
Exterior Height1 11'5"
Exterior Width2 7'
Awning Length 18'
Interior Height 7'
Freshwater Tank 31
Water Heater Capacity (gal.) 6
Holding Tank Black (gal.) 25
Holding Tank Gray (gal.) 50
LP Capacity5 (lbs.) 40
GVWR (lbs.) 7,000
Sleeps 4
Axles (lbs.) [email protected],700
Dry Weight (lbs.) 5,780
Furnace (BTU) 18,000
Hitch Weight (lbs.) 1,060
https://img1.wsimg.com/isteam/ip/d6fe8d ... /rs=w:1280


My Silverado LT specs are slightly different from racermd's
VEHICLE:
GVWR: 7200
GCWR: 15000
RGAWR: 3800
Curb Weight: 5589
Max Payload: 1611
TRAILER:
Max Conventional: 9300
Max Tongue: 930
Gooseneck: 7200
Max Tongue: 1080
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Make/Model: Chevrolet Silverado
Variant: LT
Extra Info: 1500 Duramax 3.0
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Re: GMC 1500 Duramax

Postby Tommy17 » Feb 01 2021, 1:37am

I've had my Jimmy about a month now with 6200 miles on it and I just love it lot of torque and plenty of get up and go with 25+ miles to a gallon average.
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Re: GMC 1500 Duramax

Postby i82much » Feb 01 2021, 2:00am

f150 has a great heavy payload package and i am unaware of anything comparable from competitors. like 2400 lbs or something for a crew std bed.
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