Chevrolet and Ram are enjoying a golden sales opportunity for full-size pickups.

As reported by Automotive News, falling gasoline prices and a growing economy are stoking U.S. demand, while Ford Motor Co. is caught changing over to the aluminum-bodied 2015 F-150.

The Ford F series, which includes Super Duty models, stayed in first place in September, despite a 1% drop. But counting both the Chevy Silverado and GMC Sierra, General Motors sold more large pickups than Ford overall for a second consecutive month.

The Silverado, with a 54% gain, hit 50,000 units in a month for the first time since 2012. A 30% surge for the Ram helped Chrysler Group outsell Toyota Motor Sales U.S.A. for the first time in three years.

Pickups “still rule the roost, as they have for decades,” said Karl Brauer, senior director of insights at Kelley Blue Book. But with Ford trying to avoid running low on pickups before the aluminum-bodied 2015 F-150 arrives, “they can’t get into a sales race with Chrysler and GM right now.”

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