GMC · Full-size heavy-duty pickup
GMC Sierra 3500HD towing capacity & payload by year
Maximum towing and payload for every Sierra 3500HD generation from 2005–2026, with the engines behind each rating — and what is really left once the truck is loaded.
2020–present · T1 HD
36,000 lb
maximum towing, properly equipped
What's left after passengers and cargo → Sierra 3500HD bed sizes & specs →
Manufacturer maximum for a best-case configuration. Cab, bed, drivetrain, axle ratio and options all move the real number, usually downward. Your truck's own limits are on the door-jamb sticker and in the owner's manual.
Sierra 3500HD towing & payload, generation by generation
| Years | Generation | Max towing | Max payload | Engines |
|---|---|---|---|---|
| 2020–present | T1 HD | 36,000 lb | 7,442 lb | 6.6L L8T V8 (gas) (401 hp) · 6.6L Duramax L5P V8 turbo-diesel (445 hp) |
| 2015–2019 | K2XX HD | 23,200 lb | 7,374 lb | 6.0L Vortec V8 (gas) (360 hp) · 6.6L Duramax LML V8 turbo-diesel (2015-2016) (397 hp) · 6.6L Duramax L5P V8 turbo-diesel (2017-2019) (445 hp) |
| 2007–2014 | GMT900 HD | 23,000 lb | 7,222 lb | 6.0L Vortec V8 (gas) (360 hp) · 6.6L Duramax LMM V8 turbo-diesel (2007.5-2010) (365 hp) · 6.6L Duramax LML V8 turbo-diesel (2011-2014) (397 hp) |
| 2005–2007 | GMT800 HD (Classic) | 12,000 lb | 5,800 lb | 6.0L Vortec V8 (gas) (300 hp) · 8.1L Vortec V8 (gas) (330 hp) · 6.6L Duramax LLY V8 turbo-diesel (2005) (310 hp) · 6.6L Duramax LBZ V8 turbo-diesel (2006-2007) (360 hp) |
Ratings from before the mid-2010s were set by each manufacturer's own method. The industry-wide SAE J2807 standard adopted since then is stricter, so a modern figure and an older one are not strictly comparable even on the same model.
Trucks that tow about the same
The closest models on record by maximum towing — the natural cross-shop if the rating is what you are buying on.
Sierra 3500HD towing — frequently asked
How much can a GMC Sierra 3500HD tow?
The current GMC Sierra 3500HD (2020–present) is rated up to 36,000 lb. That is the maximum for one specific configuration — usually the lighter cab and bed with the tow package and the right axle ratio. A loaded crew-cab four-by-four of the same year will be meaningfully below it, and the number on your door-jamb sticker is the one that counts.
What is the payload capacity of a GMC Sierra 3500HD?
Up to 7,442 lb across the generations on this page. Payload covers everything the truck carries rather than pulls: passengers, everything in the cab and the bed, a tonneau cover, and the tongue weight the trailer puts on the hitch. That last one is why trucks so often run out of payload while still well inside their towing rating — a 7,000 lb trailer at 12 per cent tongue weight puts 840 lb into the bed before you have loaded anything.
Has the Sierra 3500HD's towing capacity changed over the years?
Yes — across 2005–2026 the maximum rating has risen, from 12,000 lb on the oldest generation on record to 36,000 lb on the current one. Comparing across generations is not quite like for like, though: the SAE J2807 tow-rating standard was adopted industry-wide in the mid-2010s, and it produced lower, more honest numbers than the in-house methods that came before it.
Does a tonneau cover reduce what my Sierra 3500HD can carry?
It comes out of payload, not towing capacity. A hard folding or retractable cover typically weighs 50 to 80 lb, and that sits in the same budget as passengers, cargo and tongue weight. On a crew cab already close to its payload limit, it is worth counting — on a truck with plenty of margin, it is noise.
What should I actually plan to tow with a Sierra 3500HD?
Take the rating that applies to your exact truck from the door-jamb sticker, then plan to stay under roughly 80 per cent of it. That margin is what absorbs grades, headwinds, altitude and the fact that a trailer's real loaded weight is always higher than its dry weight. Then check payload separately, because that is usually the limit you hit first.
