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Theory #5: Small-diameter axletubes will allow enough flex to adversely affect the locker's function. When the tube bends either vertically (up or down) or horizontally (front to back) the locker may engage and disengage as if the vehicle is negotiating a turn.Conclusion: After running the locker with the factory diff cover, we installed Superior's newly-improved Super 35 axle truss. The new truss installs in three pieces and the fit is good, only requiring some slight tweaking of the factory brake lines. Superior claims the truss decreases vertical flex by 35-percent and horizontal flex by 52-percent. We definitely noticed a marked improvement in unwanted locker engagement and disengagement.