Chrysler’s fledgling Ram brand looks to build on its sales success by way of an expanded lineup of commercial vehicles, as it officially unveils new ProMaster City passenger and cargo vans later today at its Chelsea, MI, proving grounds.

Based on a re-engineered third generation of Fiat’s successful Doblo van, which has sold more than 1.3 million copies worldwide, the ProMaster City models will be powered by Chrysler’s Tigershark 2.4L 24-valve MultiAir2 4-cyl. engine, mated to the automaker’s new 9-speed automatic transmission that debuted in the Jeep Cherokee.

Fuel-economy data has not been released, but executives are promising the City pair will produce a best-in-class EPA rating and say the engine’s 178 hp at 6,250 rpm and peak torque of 174 lb.-ft. (231 Nm) at 3,900 rpm will rank the ProMaster City at the top of its segment. Ram pegs 0-60 mph (97 km/h) acceleration at 9.8 seconds.

The new City Tradesman commercial version replaces the current Ram Cargo Van that is based on Chrysler’s minivan architecture and will be phased out at the end of the ’16 model year, according to WardsAuto forecast data.

Although the new vans share much with the Fiat model, Chrysler was able to inject some Ram DNA into the City’s front fascia, and the brand’s strong influence is evident in the design of the vehicle’s interior, which will carry over to the new Doblo.

The front-drive City features sliding side doors and 60/40 split-swing rear cargo doors. The passenger model, which seats five, including the 60/40 tumble-and-fold seat mounted midship, gets glass in the side and rear doors. Cargo models can be purchased with or without the glass.

The Tradesman model boasts 131.7 cu.-ft. (3.7 cu.-m) of cargo room, with a load-floor length of 87.2 ins. (2,215 mm) and width of 60.4 ins. (1,534 mm) overall, including 48.4 ins. (1,229 mm) between the wheel wells. Payload tops out at 1,883 lbs. (854 kg).

The ProMaster City gets a MacPherson strut suspension up front and incorporates an independent bi-link rear suspension, not the leaf springs typical in this class. Ride height has been increased 0.4 ins. (10 mm) over the Doblo’s to accommodate rougher American roads.

The highly sculpted instrument panel’s center stack is designed around Chrysler’s now ubiquitous infotainment display screen and there are redundant accessory controls surrounding the van’s amply sized steering wheel. The automaker’s Uconnect system with voice activation also is included. There’s a full-width overhead storage compartment and numerous cubbies along and around the dashboard.

There are more than 30 safety and security features onboard, including standard electronic stability control coupled with antilock brakes, brake assist, rollover mitigation, trailer-sway control and hill-start assist. Optional equipment includes a back-up camera and park assist.

Chrysler’s Mopar operation has developed more than 60 aftermarket accessories for the ProMaster City that allows buyers to customize their vans with such things as roof racks, towing equipment and special seat covers and floor mats.