Greenwald saw promise in Hurst and Campbell and decided to finance them in a venture to manufacture large aftermarket bumpers for VW buses, which were becoming increasingly popular.

When Volkswagen began manufacturing its own large bumpers for the buses, Hurst-Campbell branched out into the piston-driven gearshift business.

[3] Hurst was promised an executive position and seat on the board of directors as part of the buyout, but Sunbeam did not follow through.

[6] Hurst produced aftermarket replacement manual transmission shifters and other automobile performance enhancing parts.

Their products were included as standard equipment in specialty models such as AMC's The Machine (also known as the Rebel Machine), and in optional performance versions of AMC AMXs and Javelins, Chevrolet Camaros, Pontiac Firebirds, Pontiac GTOs and Oldsmobile 442s, Boss Mustang 302 and the Boss 429, as well as Dodge Chargers, Plymouth Barracudas, and Plymouth Superbirds, among others.

It designed a complete Hurst Rescue System in the early 1970s, a specialty Emergency Medical Services (EMS) apparatus.