correct me if im wrong, but i dont think you can put trackkick 3rd members in sammy axles. i think you will need the complete rear axle, but im not sure about the rear since its ifs.
Actually, you can IF you use two front third members and change the side gears on the third member that you install in the rear to match the Samurai's rear axle splines.
HOWEVER, it is a bad idea to do this if you do any kind of wheeling. The aluminum housings are nowhere near tough enough to take the abuse. It may be a cheap solution, but it'll leave you stranded on the trail with a broken third member if you don't drive with care (and what's the fun in that??!?)
That's why the best thing to do (in my opinionÂÂ

) is to transplant just a matching set of TracKick FRONT ring and pinions into a set of Samurai third members. The transplant will require a "can" - which holds the spider gear pins in place and occasionally a spacer to help align the ring gear to the pinion.
To clarify the rear axle useage issue, you CAN use the rear TracKick axle with the differential after modifying the differential position, the mounting points and the overall width of the axle. However, you MUST ALSO use a front third member (or the ring and pinion gear out of same) with a MATCHING gear ratio in order for everything to work properly.