The question I get every fall from hay crews, hotshot haulers, and contractors is some version of this: can I buy the one-ton without the pickup box, so my body builder can set a flatbed, a bale bed, or a service body on it. For 2027 the answer is a clear yes, and GM publishes the chassis cab as its own lineup rather than as an option on the pickup. It is Pro or SLE, Regular Cab or Crew Cab, 2WD or 4WD, with a 14,000-pound GVWR on every model, a wide-track rear axle, and an open C-channel rear frame section made for mounting a body.
This post covers what is verified for 2027 and stops where the published information stops. Cab-to-axle lengths, upfit payload, and trailer ratings for a chassis cab are not something GM prints in the ordering material; those come from your body builder and from GM's upfitter resources, and I will point you there rather than guess. If you want the fully rated pickup instead, the 2026 Sierra 3500 HD packages section covers the rated trucks, and the what-is-new-for-2027 post walks the rest of the model year.
What Is a Chassis Cab, and What Do You Actually Get?
You get a complete truck from the back of the cab forward, and bare frame rails behind it. No pickup box, no rear bumper, no tailgate. The rear frame section is an open C-channel rather than the boxed rear of a pickup, which is what a body builder wants: it takes brackets, U-bolts, and outriggers the way a flatbed, bale bed, dump body, or service body is designed to mount. The front of the frame is the same fully boxed, hydroformed section the pickup uses.
The other structural piece that matters is the rear axle. Every 2027 chassis cab comes with a wide-track rear axle as standard, which sets the dual rear wheels further apart than a pickup dually and gives a wide body a more stable footprint. That is standard equipment, not an option you have to remember to add.
And there is one rating GM does publish: 14,000 pounds of GVWR on every 2027 chassis cab model, and no other GVWR is listed. That is the same ceiling as a dual-rear-wheel Sierra 3500 HD pickup, and it is the number your body builder works from when they size a body and figure out what is left over for the load. What GVWR does and does not mean is worth reading on its own, and the 2027 GVWR post takes it apart in detail.
What GM does not publish for the chassis cab
Cab-to-axle lengths, wheelbases, frame lengths, payload, towing ratings, and GCWR are not in the published 2027 chassis cab information. Those figures come from your body builder and from GM's upfitter resources, which is where they have always belonged, because the finished truck is only partly GM's. Anyone quoting you a chassis-cab payload before the body is chosen is making it up.
What Can You Order for 2027, Trim by Trim?
Two trims, two cabs, and both drivetrains. The Pro is the work-truck trim and is available on every chassis cab model; the SLE is offered on 4WD models. You can have a Regular Cab or a Crew Cab, and either one in 2WD or 4WD. There is no SLT, AT4, Denali, or Denali Ultimate chassis cab, which surprises nobody who has priced a service body.
| Item | 2027 Sierra 3500 HD chassis cab |
|---|---|
| Trims | Pro on all models; SLE on 4WD models |
| Cabs and drive | Regular Cab or Crew Cab, 2WD or 4WD |
| GVWR | 14,000 lb on every model; no other GVWR listed |
| Rear axle | Wide-track, standard; 3.73 with gas, 3.42 with the Duramax |
| Frame | Fully boxed hydroformed front section, open C-channel rear section for body mounting |
| Engines | Gas V8 with direct injection and variable valve timing, standard; Duramax turbo-diesel V8, B20-compatible, available |
| Transmissions | Allison 10-speed automatic; Allison 10-speed with power take-off on 4WD diesels |
| Fuel | 40-gallon rear tank standard; 63.5 gallons front and rear with the Duramax |
| Wheels and tires | 18-inch silver painted steel on the Pro, 18-inch polished forged on the SLE, LT235/80R18 all-terrain, matching spare |
| Cab-to-axle, payload, towing | Not published; from the body builder and GM's upfitter resources |
One detail to hand straight to your upfitter: GM lists two Regular Cab model numbers for each drivetrain, and the published material does not spell out how they differ. Your body builder will know which one their body is cataloged against, so ask them before the order goes in rather than after. A specialty option, the Ambulance, Fire, and Rescue Package, is tied to one of those Regular Cab models and is a fleet or government order, which is the right lane for a rural department shopping a brush or rescue body.
Cab and safety equipment follows the pickup. Adaptive cruise control is standard for 2027, as is the Sierra HD Pro Safety group with forward collision alert, lane departure warning, following distance indicator, front pedestrian and bicyclist braking, and low speed forward automatic braking. The Pro runs a 7-inch screen and the SLE a 13.4-inch screen with Google built-in and a 12.3-inch driver display. The integrated trailer brake controller is standard, and both transfer cases carry over: push-button two-speed on the Pro, Autotrac available for fleet orders. Colors are the same seven offered on a Pro or SLE pickup.
Which Engine, and Do You Need Power Take-Off?
The gas V8 with direct injection and variable valve timing is standard, and the Duramax turbo-diesel V8, B20-compatible, is available. Both pair with an Allison 10-speed automatic. A third transmission, the Allison 10-speed with integrated power take-off, is available with the Duramax on 4WD models, and that is the one that matters if your body has hydraulics.
Power take-off drives a pump off the transmission, so a dump body, a hydraulic bale bed, a crane, or a hoist runs off the truck rather than off a separate engine bolted to the frame. If your body builder's quote includes a pump and a reservoir, ask them whether they are specifying power take-off or a belt or electric system, because that answer changes your engine and drivetrain choice before anything else on the order.
Fuel is the other spec that separates a working chassis cab from a pickup. A 40-gallon tank behind the rear axle is standard, and with the Duramax you can order front and rear tanks totaling 63.5 gallons. For an outfit running a service body between Mobridge, Selby, and Pierre in a week, or a hay crew that does not want to stop in the middle of a windrow, that second tank earns its keep. Electrical capacity backs it up: dual alternators are available, and so is a universal vehicle module, an upfitter switch kit with three 30-amp and two 20-amp circuits, and a high idle switch for running equipment while parked.
A winter note on Snow Plow Prep
The Snow Plow Prep Package is available on the chassis cab, requires 4WD, and cannot be combined with the heavy-duty front spring package. If you hold a November-to-March snow contract and also want a hydraulic body, get those two lines in front of your body builder and your salesperson at the same time so they do not fight each other on the order.
A hotshot deck, a bale bed, or a service body starts with the same decision: where the body mounts, what the body weighs, and what is left for the load.
What Does Your Body Builder Need From You?
Three things, in this order: the cab and drivetrain you want, the body you want on it, and the cab-to-axle length that body requires. The third one is the piece that comes from them and from GM's upfitter resources, not from a sales brochure, and it is the reason the order has to be a three-way conversation instead of a two-way one.
The same goes for what the finished truck can carry and pull. Once a flatbed, a bale bed, or a service body with compartments full of tools is bolted on, the weight of that body comes out of what is available under the 14,000-pound ceiling. Your body builder calculates the finished weight and the load capacity of the completed vehicle, and the final labels on that truck reflect the truck as it is delivered to you. Read the trailering information label in the driver door jamb and the loading placard when it arrives, and scale the finished truck loaded the way you actually run it.
For scale, and clearly labeled as a different truck: the 2026 Sierra 3500 HD pickup is rated by GM at up to 20,000 pounds conventional, properly equipped, and a 2026 4WD Crew Cab long bed dually with the Duramax is rated at 31,000 pounds on a gooseneck. Those are 2026 pickup ratings on pickup configurations, they do not transfer to a chassis cab, and GM has not published 2027 ratings for either truck line yet. If you want that arithmetic worked all the way through on a real load, the hotshot and harvest post does it step by step.
Chassis Cab, or a Pickup With the Box Taken Off?
Both roads exist, and I have sold trucks down each of them. The pickup line offers a bed delete on a Pro or SLE long bed, so you can order a pickup without the box and have a flatbed set on it. The chassis cab is purpose-built for the job: open C-channel rear frame, wide-track rear axle, the bigger fuel tanks, and a frame your body builder already has in their catalog.
Where the pickup route makes sense is when you want a truck that can go back to being a pickup, or when you want a trim the chassis cab does not offer. Where it costs you is in fit and in time: a body cataloged for a chassis cab frame is a bolt-up, and the same body on a boxed pickup frame is a fabrication job with brackets somebody has to make.
Be honest about the day-to-day, too. Either way you end up with a wide, long, dual-rear-wheel truck. It will not fit every shop door or every automatic car wash, it rides harder empty than a single-rear-wheel truck, and a Crew Cab with a long body is a lot of vehicle in a downtown parking spot. That is the cost of a truck that hauls at capacity every week, and for the outfits buying these, it is a cost worth paying. The cab and configuration section of the 2027 buyers guide covers the choices side by side.
How to Order a 2027 Chassis Cab With Your Body Builder
Work it in this order and the truck and the body arrive matched instead of nearly matched.
- Pick the body first: flatbed, bale bed, dump, or service body, with its real weight and its mounting requirements. Everything downstream is set by that choice.
- Get the cab-to-axle length from your body builder: they will tell you which chassis cab model their body is cataloged against, including which of the two Regular Cab model numbers to use.
- Decide on hydraulics before the engine: if the body needs power take-off, you are ordering the Duramax on a 4WD model with the power take-off transmission, and that decision cannot be added later.
- Spec the electrical and fuel to the work: dual alternators, the upfitter switch kit, the universal vehicle module, high idle, and the 63.5-gallon tank option with the diesel for long days between towns.
- Add the seasonal equipment now: Snow Plow Prep needs 4WD and does not combine with the heavy-duty front spring package, so settle that conflict while the order is still open.
- Scale and label the finished truck: when the body is mounted, weigh it, read the loading placard and the trailering information label in the driver door jamb, and keep a copy of the completed-vehicle paperwork from the upfitter in the glove box.
Is the Chassis Cab the Right Truck for Your Outfit?
| Worth it if | Skip it (buy the pickup) if |
|---|---|
| A flatbed, bale bed, dump body, or service body is going on the truck and staying on Your body needs power take-off hydraulics You want the wide-track rear axle and the bigger fuel tanks Your body builder already catalogs a bolt-up body for this frame |
You want a pickup box, a tailgate, and a truck that can go back to hauling calves and kids You want a trim above the SLE, or leather and the bigger creature comforts You need a rated, published trailer figure on paper before you sign You need a truck in the yard this fall rather than a build and an upfit |
Key Takeaways
- The 2027 Sierra 3500 HD chassis cab is its own lineup: Pro or SLE, Regular or Crew Cab, 2WD or 4WD, with SLE on 4WD models.
- Every model carries a 14,000-pound GVWR, a wide-track rear axle, and an open C-channel rear frame section built for mounting a body.
- Both engines are offered with an Allison 10-speed, and power take-off is available with the Duramax on 4WD models for hydraulic bodies.
- Fuel runs 40 gallons standard or 63.5 gallons in front and rear tanks with the Duramax; 18-inch wheels and LT235/80R18 tires are standard.
- Cab-to-axle, payload, and towing figures for a chassis cab come from the body builder and GM's upfitter resources, and the finished truck's labels are the final word.
Frequently Asked Questions
Can you order a 2027 GMC Sierra 3500 HD as a chassis cab for a flatbed or bale bed?
Yes. GM publishes the 2027 chassis cab as a separate lineup in Pro and SLE trim, Regular Cab or Crew Cab, 2WD or 4WD, with the SLE offered on 4WD models. It comes with an open C-channel rear frame section and a wide-track rear axle so a body builder can mount a flatbed, bale bed, dump body, or service body.
What is the cab-to-axle length of a 2027 Sierra 3500 HD chassis cab?
GM does not print cab-to-axle lengths, wheelbases, or frame lengths in the published 2027 chassis cab information, so we will not quote one. Your body builder works from GM's upfitter resources and will tell you exactly which model number their body is cataloged against. Bring us that answer and we will order to it.
Does the chassis cab offer power take-off for a hydraulic bed?
Yes, with the Duramax turbo-diesel V8 on a 4WD model, through an Allison 10-speed automatic with integrated power take-off. Dual alternators, a universal vehicle module, an upfitter switch kit, and a high idle switch are also available for equipment that runs while the truck is parked.
How much can a 2027 chassis cab carry once the body is on it?
The GVWR is 14,000 pounds on every model, and the weight of the body comes out of that ceiling before your load does. The exact capacity of a completed truck is calculated by the upfitter, and the loading placard and the trailering information label in the driver door jamb of the delivered truck are the figures to work from. Scale the finished truck loaded the way you run it.
My Take on the 2027 Chassis Cab
For the outfits around here that feed with a bale bed, run a service body, or haul a hotshot deck, this is the honest truck for the job, and it is nice to finally have the 2027 information in hand to talk about it. The wide-track axle, the open frame rails, the option of 63.5 gallons of fuel, and power take-off on a 4WD diesel are the things that make a working body work, and none of them are afterthoughts on this truck.
The part I will keep repeating is that a chassis cab is a three-way order. You, us, and the body builder all have to be in the same conversation, because the numbers that decide the truck, cab-to-axle length and finished capacity, live with them and not with a brochure. Get them on the phone before the order goes in and the truck shows up right the first time.
The full 2027 detail is in the 2027 GMC Sierra 3500 HD buyers guide, and the rated pickups are in the 2026 buyers guide. Come see us at Beadle Chevrolet GMC, 2200 US Hwy 12 in Mobridge, or call or text 605-845-7277, and bring your body builder's spec sheet with you.
About the Author
Lexy Tabbert — Beadle Chevrolet, Mobridge, SD
Lexy Tabbert is the Director of Sales and Marketing at Beadle Chevrolet in Mobridge, South Dakota. She covers Chevrolet and GMC vehicles, trim comparisons, and buyer guidance — helping families, ranchers, and ag operators across the region find the right truck and configuration for their needs. Learn more about Lexy.
