Add to Cart Quaife Vauxhall Cavalier / Calibra (F25) Quaife Atb Helical Lsd Differential, Qdh5J $1,361.46 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. ... $1,361.46 Add to Cart