The 4x4 Viper was the first four-wheel drive buggy from AYK. Introduced in 1985 its transmission was derived from the Buffalo/Bobcat 2wd buggies and adapted into 4wd with the use of a chain drive to the front differential, all riding on a formed monocoque chassis with a fiberglass upper deck. Suspension was reminiscent of the Sidewinder with a trailing arm independent front suspension and semi-trailing arm rear with oil filled aluminum shocks appearing at all four corners. The 4x4 Viper originally came with an exposed cage as seen, though a later Viper Shuttle was offered with clear polycarbonate buggy style body.
1986 saw the release of the Boxer, the final 2wd buggy to be produced by AYK. The Boxer offered new wheels, tires and body but otherwise remained essentially unchanged from the Buffalo and Bobcat aluminum ladder frame, mono-shock double wishbone front suspension and semi-trailing arm rear design that it replaced.