Add to Cart Quaife Ford S-Max 2.5 (6-Speed - M66) Turbo Quaife Atb Helical Lsd Differential, Qdf13J-4 $1,379.89 Quaife ATB Helical LSD differential is suitable for the Ford S-Max 2.5 (6-speed - M66). A direct replacement for the standard Ford S-Max 2.5 open differential, the Quaife ATB Helical LSD... $1,379.89 Add to Cart