my box is leaking right at the bottom of the box where the pitman arm shaft comes out. i want to fix this leak immediately and i want to do it properly, the napa man says he has a kit with either a lower seal kit or a whole seal kit. i do not know what that means or what is inside this box. is there any schematics available online, and any tips on this process like do i need to remove the box. the shaft is not moving around so i feel the bearings are fine. it seems like if i just pop in a new lower seal it would be fine, but i'd like some expert opinion on this. and the easiest way to do the job. thanks alot in advance.