U.S. sales of pickup trucks by the Detroit Three automakers took a bit of a dive in June. The top-selling F-Series from Ford Motor Co. (NYSE: F) posted a sales decline of 8.9% year over year, and the Ram pickups from Fiat Chrysler Automobiles N.V. (NYSE: FCAU) could manage just a 1% year-over-year increase in sales.

General Motors Co. (NYSE: GM) reported a sales year-over-year gain of 18.4% on its Silverado pickups to a June total of 51,548 units. The GMC Sierra pickups posted a gain of 20.8% in June, and combined the two pickup models sold 70,166 units in June.

Fiat Chrysler reported June sales of 33,332 units, up 1%, after posting a 2% year-over-year sales increase in May. Last year, Ram sold 33,149 pickups in June. For the first half of 2015, Ram pickup sales are up 4% to 212,716 units and total brand sales are up 8% to 230,946 units. Ram pickups had their best June sales in 11 years, but the monthly increases are getting smaller.

At Ford, June sales declined to 55,171 units and sales are now down 2.4% year to date. Truck sales comprise about 34% of all Ford division sales and the F-Series pickups accounted for 24% of total sales in June. Ford has said that F-150 sales will strengthen in the second half of this year, once the second assembly plant in Kansas City is running at full capacity. The company had better hope so.

Toyota Motor Corp. (NYSE: TM), the other full-size truck maker, said light truck sales were up 16.5% year over year in June with sales of the full-size Tundra up 10.6% to 9,926 units.

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Adding sales for all four full-size pickup truck makers gives a total of 168,595 units. The Ford F-Series gets 32.7% of the market, the Chevy Silverado gets 30.6%, the Ram nabs 19.8%, the GMC Sierra gets 11% and Toyota’s Tundra posts 5.9%.

With its two full-size pickup offerings, GM now has about 42% of the overall pickup market, and sales of the Chevy Silverado are now less than 10% below those of the long-time leader, the F-Series from Ford.

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