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I need help finding the right pos lock for my 01 f250 SD 5.4L Supercab shortbed. I have full axle on front and rear. I believe its 4.10 gear but could b 3.73. I use the truck in fields and to plow in snow. Im sick of the one tire fire when it starts to slip. its always the easiest tire that spins. Doesn't make sense why it does it. I don't have a ton of money but could use a good fix for atleast the rear end. My boss don't like pulling me out all the time. haha