Lockers and Spools
Subcategories
Lockers and spools force both axle shafts to rotate together for maximum traction in low-grip situations. Full spools permanently lock the axle; automatic lockers (such as Detroit Locker-style units) engage under load; selectable air lockers (like ARB) let you lock and unlock on demand.
MY4BY stocks lockers for popular Dana, GM, Ford, and import axles. Confirm spline count, carrier size, and gear ratio compatibility. For PowerTrax Lock-Right fitment, see the PowerTrax Application Guide.