I know there are several threads out there on doing this but I came up with a way that didn't require hammering in putty knives or screwdrivers. All you need is a 2 x 4. The long piece is about 4 foot and the second piece, about 10 inches long is cut wedge shaped. The long 2 x 4 sits is pried against the axle stub and the wedge pushes on the left or right head. Quick, easy on two cars that didn't want to separate by wiggling/shaking... I would post a photo but for some reason I'm not allowed to post attachments.