what differentials do i have
If it is only driven offroad, and tire wear is of no importance than you can save a ton of cash by installing a spool or welding the diff gears.
If you have to drive on the street, have a decent budget, and actually care about how long your tires last, than a conventional locker, such as one made by Detroit , will work if you are willing to make some subtle changes in your driving style.
If you have a large budget and want the best of both worlds than look for a selectable locker. These allow you the convenience of an open differential while on the street, but can act like as spool at the simple flick of a switch. ARB makes one of these, but it requires the installation of an air compressor.
I don't honestly know what you have for a front axle, I don't pay much attention to IFS. But if I had to take a guess I would say it was a Ford 8.8 inch centersection, but it may take different internals than a standard solid axle 8.8 inch.



