In 1988 Donald Cassel came up with the inverted king pin for trucks. This king pin flipped the nut around, so that there was less material to get in the way when grinding on a truck. This idea was called the Grind King King Pin. A few years later, 1991, Cassel turned his kingpin idea into a full truck, and the Grind King truck was born. This truck was then reborn in 2001; the Grind King AXL was introduced. This truck featured the V-beam axle, which prevents slip axle. Now Grind King is on the AXL 2, which boasts even more advances in truck technology.