I'm 6'6 and have a 97 xj, while it is a little tight I got used to it pretty quick and it grew on me...I'm pretty comfy now with the seat all the way back and the tilt wheel down almost all the way
also gotta love some of the "WTF" looks on peoples faces when I jump in or out :roflmao:
I haven't looked at the seat slider mechanism, but I'd imagine the easiest way to mod it would be to mount the seat further back on the mechanism vs. trying to move the mechanism back on the floor being unibody and all, but thats pure speculation