Chevrolet and GMC are partnering with Power Solutions International, Inc. (PSI) to introduce heavy-duty pickups and full-size vans powered by 6.0-liter V-8 LPG-capable engines starting in the first quarter of 2017. Chevrolet also will offer LPG versions of its new Low Cab Forward commercial truck.

The announcement follows the selection of PSI, based in Wood Dale, Illinois, as General Motors Fleet’s preferred upfitter for LPG and CNG trucks. PSI is a North America’s largest provider of integrated turnkey alternative-fuel powertrain solutions.

Ship-through will be offered, allowing customers to seamlessly order and take delivery from the same dealer. GM will supply vehicles equipped with the 6.0L V-8 engine with hardened valves and valve seats to PSI, which in turn will install the alternative fuel system and other hardware and ship directly to Chevrolet and GMC dealers in all 50 states. All PSI-modified vehicles are covered by Chevrolet and GMC’s five-year/60,000-mile (whichever comes first) limited powertrain warranty.

The expanded line-up brings GM Fleet’s portfolio of alternative fuel to more than a dozen trucks, cars and crossovers. “Expanding choice is the key to helping more commercial and government fleets reduce their fuel consumption, fuel costs and emissions using alternative fuels versus using traditional gasoline,” said Ed Peper, U.S. vice president of GM Fleet.

LPG models include Chevrolet Express Cargo, Express Passenger, Express Cutaway, Silverado HD, Low Cab Forward 3500 and 4500; as well as GMC Savana Cargo, Savana Passenger, Savana Cutaway, and Sierra HD.