Seal & piston retainer ring kit for Haas 40 taper HI/LOW gearbox shift cylinder. Is your gearbox shifting intermittently, poorly or not at all? Don't spend thousands over a broken o ring or retaining ring. Haas will not tell you this seal kit might fix your issue. This is not a guaranteed fix, but in most cases, this is the shifting issue we find in the gearboxes we repair and rebuild.