Need to adjust your pinion angle for better driveshaft alignment or to fix vibration issues? This Specialty Products axle shim is a heavy-duty zinc alloy wedge measuring 4 inches by 6.5 inches with a 2-degree angle. You install it between your leaf spring and axle perch to change the angle of your axle. It's a common fix for lifted trucks, off-road vehicles, or any situation where your pinion angle is off after modifying suspension. The zinc material resists corrosion. Just make sure you know what angle correction you need before buying – this is specifically a 2-degree shim. A must-have for serious DIY mechanics or off-road enthusiasts tuning their suspension.