2020 Chevy Silverado 3500 HD Cab Chassis Will Have Large 40 or 63 Gallon Fuel Tank Options (Report)

2020 Chevrolet Silverado 3500 HD DRW Work Truck

Many of you keep asking us about any updates on the upcoming 2020 Chevy Silverado HD and GMC HD trucks. We brought you the world debuts of each truck and all the specifications we have so far, but there is a bit of new information out there about the upcoming 2020 GM heavy duty chassis cabs.

This information comes to us via the GM Fleet Order Guide. We already know that the new HD trucks will have a choice of two engines: 6.6L gas V8 (L8T) and a 6.6L turbo-diesel V8 (L5P).

The gas engine is rated at 401 hp @ 5,200 rpm and 464 lb-ft of torque @ 4,000 rpm. It’s mated to a 6-speed automatic.

The Duramax diesel is rated at 445 hp @ 2,800 rpm and 910 lb-ft of torque @ 1,600 rpm. It’s mated to a 10-speed automatic transmission.

The new 2020 GM chassis cab information available in the Fleet Order Guide lists three available fuel tanks sizes: 23, 40, and 63 gallons. Yep, there is a lot of potential fuel-carrying capacity. The order guide does not have a description, but the 40 gallon tank may be a “mid-ship” tank that is mounted between the rails. The 63 gallon capacity is likely there with the dual fuel tank setup (23 gal + 40 gal).

Note: Thanks to JJ for giving us a lead to the new chassis cab information.

The specs you see above are for 2WD and 4×4 crew cab chassis cabs with a 60-inch cab-to-axle (CA) length.

For comparison, the standard 2020 Chevy Silverado HD trucks (with a regular pickup bed) are listed to have just one tank with a 36 gallon fuel capacity.

As we knew previously, the maximum Gross Combined Weight Rating (GCWR) is 40,000 lbs. This means the maximum truck, trailer, and cargo load cannot exceed 40,000 lbs.

Here is everything else we know about the upcoming 2020 GM heavy duty trucks.