2024 GMC Sierra HD Chassis Cab Discontinued for Ordering

Ever since GMC announced they would no longer take orders for the 2024 Sierra HD Chassis Cab, the move has raised questions about the future of their commercial truck lineup for fleet buyers who rely on these workhorses.

What Makes the 2024 Sierra HD Chassis Cab Special?

The 2024 GMC Sierra HD Chassis Cab has been the brand’s premier heavy-duty pickup offering a no-frills work truck platform. Based on the Sierra 3500 HD dual rear wheel cab and chassis configuration, it ditches the bed for a bare frame ready for upfitting. Two engines were available – the optional 6.6L Duramax turbodiesel making 470 hp and 975 lb-ft of torque, or the standard 6.6L L8T gas V8 with 401 hp and 464 lb-ft.

The diesel bolted to a 10-speed Allison automatic (the gas engine uses a six-speed automatic) and sent power through to a rear axle with GVWR ratings up to 30,000 lbs depending on configuration. Other highlights included heavy-duty cooling, brakes and suspension for tough towing and hauling. It was the perfect blank canvas for everything from service trucks to dump beds and more.

Why Did Orders Stop for the 2024 Model?

No official reason has been given but the speculation is GM wants to focus on electric trucks going forward. The 2024 GMC Sierra HD Chassis Cab likely didn’t meet upcoming emissions standards either. With so much money going into battery tech, it was probably deemed not worth it to re-engineer the gas engines.

Commercial customers also want lower operating costs that EVs potentially offer. Still, ditching the tried-and-true gas chassis cab so abruptly left a hole in GMC’s fleet lineup that will be hard to fill quickly with electrics. A shame they couldn’t keep it around just a bit longer.

Will There Be an Electric Replacement?

It’s a safe bet GMC has electric trucks in the works to eventually slot in above the Sierra 1500, including potential chassis cab models. Their upcoming Sierra EV pickup will use GM’s new BT1 truck platform engineered to support different body types. But don’t expect an electric Sierra HD chassis cab before late 2025 at the absolute earliest given development cycles.

In the meantime, work truck customers will need to look elsewhere. Ford’s electric E-Transit is coming, and automakers like Freightliner offer diesel chassis cabs that could potentially be adapted with range extenders. It’s a big opportunity for GMC‘s competitors while they wait for GM’s electric commercial trucks to arrive.

What About Diesel Fuel Support?

Another open question is whether GM will continue supporting diesel fuels long-term, which are still crucial for work trucks. Their 6.6L gas V8 was never great on fuel compared to diesels. Will they bring back a new turbodiesel if demand is there? Or switch work trucks to alternative fuels like renewable natural gas?

It’s a tough situation balancing new tech, costs, and the needs of commercial customers. GMC will need to have answers for diesel if they want fleets to wait years for electric replacements. Gas just doesn’t cut it for many applications.

Will the 2024 Sierra HD Chassis Cab Return?

All signs point to the 2024 GMC Sierra HD Chassis Cab being gone for good. GM is pushing hard on EVs now, with billions invested. It seems unlikely the company will retool gas or diesel engines again just for a niche work truck. More likely, the platform will live on in spirit when electric Sierra chassis cabs arrive later in the decade.

In the meantime, commercial buyers are in a tough spot with this hole in GMC’s lineup. It was nice to have the gas option while waiting for batteries to improve. Hopefully electrics progress fast so fleets aren’t left stranded without a GM workhorse for long. Exciting times but a big change from the tried-and-true HD chassis cab.

Speculation on Powertrain Upgrades for the Future 2024 Sierra HD Chassis Cab

While the current gas engines in the 2024 GMC Sierra HD Chassis Cab get the job done, there’s always room for improvement. If GM does decide to bring the model back in the short term, an updated version of the 6.6L turbodiesel seems like a reasonable bet, possibly with more power and torque along with better fuel efficiency.

A new 10-speed or even 12-speed automatic transmission would help maximize performance from the diesel too. On the gas side, an improved 6.6L or a possible new small-block V8 could raise the bar. But diesel is still king for work, and fleet customers would likely welcome any upgrades that increase towing or hauling capability.

Outlook on the Eventual Electric 2024 GMC Sierra HD Chassis Cab

All signs point to the 2024 GMC Sierra HD Chassis Cab being reborn as an electric model down the road. But what might it look like? Dual electric motors with around 500 horsepower combined seem fitting. A massive battery pack would provide serious torque for towing while also offering decent range.

Fast charging capabilities are a must for work applications too, since fleets can't afford to sit around all day recharging. GM will likely engineer plenty of configuration options to handle different body upfits as well. An electric chassis cab could meaningfully shift how commercial fleets operate, if GM gets the execution right.

Final Thought

While the halt of the 2024 GMC Sierra HD Chassis Cab signals the end of an era for gas-powered work trucks, it also represents an exciting new chapter as battery technology advances. GMC and the entire industry face challenges in the coming years to give fleets suitable electric replacements.

When production electric models like the Sierra eventually arrive, they will likely build upon the toughness and reliability that trucks like the 2024 Sierra HD Chassis Cab were known for. It marks the end of an era to see this workhorse go, but the outlook remains positive for both GMC and the commercial vehicle segment overall.

FAQ

Will there be any new exterior colors?

No new colors were announced for the 2024 model before orders stopped; it carried the existing chassis-cab color lineup.

What was the payload and towing capacity?

Payload and towing figures on a chassis cab vary significantly by final body upfit, axle ratio, and cab configuration. GM's published GCWR/GVWR and payload ratings for the specific configuration you're comparing are the only reliable source, so don't rely on a single generic number for a work-truck build.

What engine and transmission options were there?

Two engines were offered: the standard 6.6L L8T gas V8 (401 hp / 464 lb-ft) paired with a six-speed automatic, or the optional 6.6L Duramax turbodiesel (470 hp / 975 lb-ft) paired with a 10-speed Allison automatic, both driving the rear wheels.

Were there any special upfit packages?

Chassis cabs are typically sold as a bare cab-and-frame for third-party upfitters (service bodies, dump beds, toolboxes, ladder racks, etc.) rather than with factory-installed upfit packages. Check with your specific GMC dealer or upfitter for what was available on the 2024 model.

How much did one of these trucks cost?

Chassis-cab pricing depends heavily on engine choice, axle/GVWR configuration, and any dealer-installed options, and doesn't include the upfit body itself. Check GMC's build-and-price archives or a dealer invoice for an exact 2024 base MSRP rather than relying on a rough estimate here.