ARB Differential Master Shim

The ARB Differential Master Shim is a precision differential shim made for ARB Air Locker air-operated locking differentials. It is used when you set up carrier bearing preload during an Air Locker installation or service. Depending on the Air Locker model, it is also called a differential carrier bearing shim or an Air Locker master shim.

Key Features:

• Made for use with ARB Air Locker differentials
• Sits between the seal housing and the bearing cup, or between the bearing cup and the axle housing bearing seat, depending on the application
• Helps keep the seal housing clear of the bearing cage
• Works with the shim pack to set carrier bearing preload and end float
• Genuine ARB component, available in variants for different Air Locker applications

Accurate shimming is important for bearing life and for reliable Air Locker operation. Follow the ARB installation guide for your Air Locker model when you measure and select shims. Use the variant that matches your Air Locker application.