This is a Mack 65,000 pound camelback spring rear axle assembly, it has a heavier trunnion assembly and heavier springs than the 44,000 pound bogie. This axle set can be used with any of our frame kits, and can be adapted for use with almost any other frame. This bogie has a 58" (.666") axle spread, and can use any of our wheel sets, but is best utilized with our 14.00x24 wheel sets.