Navistar’s headquarters in Lisle, Ill. The company’s International Trucks brand sold 3,039 units in July, a 36.3% increase year-over-year. (Christopher Dilts/Bloomberg News)

U.S. Class 8 retail sales in July increased 2.5% from a year ago but were down from the prior month, Wards Intelligence reported.

Class 8 sales reached 21,021 units, up from 20,513 in July 2022, but volume was down 12.7% from the 24,085 sold in June. Retail sales have experienced a year-over-year increase every month this year. Year-to-date, Class 8 sales are up 18.2% to 156,821 compared with 132,694 at this time in 2022.

Four of the seven major truck makers experienced a year-over-year decline despite the overall total being positive. Navistar, parent of International Trucks, helped drive the total with the biggest year-over-year percentage increase at 36.3%, to 3,039 units from 2,229 units. Western Star followed with its sales increasing 23.4% to 681 units from 552.

Freightliner continued to hold the largest market share at 36.2% but experienced a 3.1% year-over-year decline in sales to 7,610 from 7,855. Kenworth Truck Co.’s sales decreased 1.3% to 3,026 units from 3,067, while Peterbilt Motors Co. saw sales fall 2% to 3,325 from 3,392. Both are brands of Paccar Inc.

Mack Trucks’ sales rose 5.5% to 1,366 from 1,295, but Volvo Trucks North America’s sales slipped 8.4% year-over-year to 1,944 from 2,123, according to Wards. Mack and VTNA are brands of Volvo Group.