[:@]Hey, I have a 2002 Dakota slt has a l legger rear end havnt checked the gears proaly 3.75 or so idk... any way i want to put in a posi that works with the exsisting front diff, any ideas or do i have to change both also any recomdations on parts or on how hard it is to do?

thanks travis

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You've got either a 3.55 or a 3.92

Keep the ratio the same and any differential will work.