Transmission Limiter Kits are designed for 'Hard-tail' rear engine dragsters utilizing a "shorty" powerglide, 9" Ford center section and a mark Williams, standard length, quick disconnect coupler or for most 4-Link dragsters. Kits are designed to eliminate lateral movement of the engine & transmission during hard acceleration. S&W highly recommends that these kits be used in conjunction with a set of engine limiters (P/N #20-608) OPTION: Large 1-1/4" tubular handle for comfortable grip.