Add to Cart Quaife Vauxhall Cavalier / Calibra (F25) Quaife Atb Helical Lsd Differential, Qdh5J $929.66 Quaife ATB Helical LSD differential is suitable for Vauxhall Cavalier / Calibra models with F25 transmission. A direct replacement for the standard open differential, the Quaife ATB Helical LSD differential transforms your car's performance. ... $929.66 Add to Cart