Replace your factory pinion snubber with an adjustable snubber from Proform. Specifically designed to control wheel hop and limit axle housing rotation on 1985-1993 Ford Mustangs. It can also be retro fitted to work with earlier models with some modification. Adjustable in 1/4" increments to fit your driving preference. This snubber features an ultra-durable yellow chromate finish for long lasting good looks.