Machine description: Cat C7 300 hp Engine, Allison 3000 Automatic Transmission, 12000 lb Front Axle, 23000 lb Rears, Dana S23-170 Drive Axles, 4.78:1 Axle Ratio, 11R22.5 Front Tires, 11R22.5 Rear Tires, Spring Suspension ... more info about the 2005 Peterbilt 335.