The ARB Air Locker(TM) Differential Spreader is an essential professional tool for differential installation. For common Salisbury-type axle assemblies (e.g., Dana Spicer model 44), a differential spreader is required during setup to ensure proper carrier bearing preload. Spreading the housing casting (or pumpkin) with sufficient force to insert additional shims to create preload is the method recommended by OEM manufacturers, many of whom include specific spreader sockets on the housing for this purpose. Insufficient preload can lead to bearing and ring & pinion failure, as well as oil or air leaks in an Air Locker(TM) Differential. As part of the ARB Air Locker(TM) tool series, this specialized tool makes the preload process for these axles simple, fast, and highly effective.
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