Stretching the housing casting (AKA pumpkin) open by sufficient enough force as to allow extra shim to be added to create the pre-load is the method that the OEM manufactures endorse, and most manufactures have included special spreader sockets in the housing for exactly this purpose.
Attempting to pre-load an adjuster nut type differential has proven to be a common cause of incorrectly pre-loaded assemblies and/or damage to the adjuster nut or bearing journal surface.
g. 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 powder coated 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;California Residents: WARNING Most common Salisbury style axle assemblies (e.