Brand: ARB Manufacturer's Part Number: 770003 Part Type: Case Spreader Product Line: ARB Air Locker Differential Case Spreaders Summit Racing Part Number: ARB-0770003 UPC: 09332018010193 Spreader Material: Steel Spreader Finish: Black Quantity: Sold as a kit. Notes: Includes storage case. ARB Air Locker Differential Case Spreaders ARBs Air Locker differential case spreaders are professional automotive tools that no differential installer should be without. Most common Salisbury-style axle assemblies (e.g.， Dana Spicer model 44) require the use of a differential spreader in order to achieve the required carrier bearing pre-load during setup. Stretching the housing casting (or pumpkin) open by sufficient enough force (allowing extra shim to be added to create the pre-load) is the method that the OEM manufactures endorse―and most manufacturers have included special spreader sockets in the housing for exactly this purpose. Insufficient pre-load can result in bearing failure or ring and pinion failure on any differential―and possible oil/air leakage issues in an Air Locker differential. As a part of ARBs Air Locker Tools range of differential service/installation equipment， this specialty tool offers an easy， quick and highly effective way of pre-loading these axles. Additional details: * Allows the housing to be stretched in a safe and controllable way， which reduces the risk of causing permanent damage to the housing * Comes in a durable carry case with a dedicated powdercoated parts tray for easy storage and transport * Pre-drilled with a hole pattern that suits most of the commonly available axle types * Suited to pre-loading shim adjusted banjo style axle assemblies