Adjustable Pinion Snubber for 1985-1993 Mustang, Controls wheel hop in mildly modified 8.8 Axle equipped 1979-1993 Mustangs and similar Fox body cars. Directly replaces stock pinion snubber, can be adapted to earlier models with out factory snubber, Limits housing rotation and controls wheel hop. Easily adjustable in 1/4" increments for different driving situations