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The next step requires a good straightedge and an angle gauge. The angle gauge is used to set the rearend housing for a bit of pinion angle (though there’s a lot of differing recommendations, I always set mine at 3-degrees of upward angle). The straightedge is used to ensure that the bar brackets are centered and the rear side of the brackets (where the shock mounting holes are located) are parallel to the mounting surface of the third member. Once in place, the brackets are tack-welded to the axle tubes.