Stellantis is delaying the start of production of the Ram 1500 REV electric pickup truck to the first half of 2025, Reuters reports.

Production was originally scheduled to start before the end of this year, making the REV a 2025 model, but is being pushed back to ensure quality, Stellantis CEO Carlos Tavares said on a media call with Reuters and other outlets.

“We are just facing a very significant amount of workload,” Tavares said.

First shown in 2023, the Ram 1500 REV aims to upstage the Ford F-150 Lightning, Chevrolet Silverado EV, Rivian R1T, and Tesla Cybertruck with up to 500 miles of range, courtesy of a 229-kwh battery pack. A 168-kwh pack will be standard, delivering what Ram estimates to be up to 350 miles of range. And 350-kw DC fast-charging can recover up to 100 miles of range in about 10 minutes, Ram has said.

Ram has also confirmed a dual-motor all-wheel-drive powertrain producing 654 hp and 620 lb-ft of torque. It’s promised a 0-60 mph time of 4.4. seconds, a 14,000-pound towing capacity, and a 2,700-pound payload capacity.

2025 Ram 1500 REV at the 2023 New York auto show

Stellantis is also preparing a range-extended Ram 1500 Ramcharger pickup. This uses a 92-kwh battery pack that Ram has said will provide 145 miles of range on its own, while a V-6 engine provides another 545 miles by running as a generator. This truck is also slated to arrive as a 2025 model, but Ram hasn’t confirmed exact timing.

The electrified Ram 1500 trucks are based on the STLA Frame platform, which the automaker just this week provided further details on. It’s the largest of four so-called multi-energy platforms first announced in 2021, and designed to support battery-electric, hybrid, plug-in hybrid, hydrogen fuel-cell, and internal-combustion powertrains. In addition to Ram trucks, STLA Frame will be used for commercial vehicles and full-size SUVs such as the next iterations of the Jeep Wagoneer and Grand Wagoneer—which will also get range-extended powertrains.