Let me make this more plain. It's for YOUR rear axle, direct bolt in. The SRW 2500 and 3500 trucks have the EXACT same housing minus the control arm/leaf spring mounts. The 3500 DRW has the 12" ring gear, but the locker can also be used in a DRW truck if you use the 11.5 bearings and 11.5 ring gear. Buy it, or don't. You asked a question, I put the answer on your plate. 🤷♂️
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