Sales of Class 8 trucks were down 32.9 percent in July 2009 from July 2008
, according to the Automotive News Data Center. Overall, sales of Class 4-8 trucks dropped 26.7 percent in July, and have not seen a boost year-over-year since January 2007, reports Automotive News.

Class 8 sales settled at 7,503 during the month of July, down from 11,174 in July 2008. For the first seven months of this year, sales of heavy-duty trucks were at 50,960, a 33.3 percent fall from the same period of 2008, when sales amounted to 76,442 units.

Meanwhile, Class 4-8 saw sales of 127,009 units for the first seven months, compared to 197,635 for the year-ago period, a decline of 35.7 percent, according to the news service's data.

All of the Class 8 manufacturers saw negative numbers in July, with heavy-duty sales at Freightliner down 36.2 percent, International down 23.6 percent, Kenworth down 21.4 percent, Mack down 29.1 percent, Peterbilt down 30.6 percent, Sterling down 57.4 percent, Volvo down 52.7 percent, and Western Star down 41.9 percent.