Our T-shirt Designs & Hot Rod History: Bonneville Stromberg Carbs Zephyr Gears	Hot Rod History: Lincoln Zephyr Gear Clusters Hot rodders looking for serious performance out of their early Ford or Mercury hot rods, found it advantageous use either a 25 or a 26-tooth gear cluster from a 1940-48 Lincoln-Zephyr gearbox.  It was usually a simple "bolt-in" procedure.    Click on photo to see exploded view. View the shirt