1987 peterbilt 379 tri axle. Double frame, wet kit, 20,000lb tag axle, 3406B Caterpillar, 18spd. Truck runs great shifts smooth. Only 40,000lb rears and 12,000lb steer. Tires are over 90% brakes are good. Trucks still PA inspected. 690,000 miles on truck. Please massage me with further questions and pictures of the truck.