ARB Shim DriverARBs new Air Locker(TM) Shim Driver is a professional automotive differential service tool for installing servicing common shim pre loaded differentials. Insufficient carrier bearing pre load can result in premature bearing failure and ring and pinion failure in all differentials, and possible oil air leakage issues in an Air Locker(TM) differential. Most common Salisbury style axle assemblies(e. g., Dana Spicer model 44) require the pre load shims to
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