[Hydrex]

I you can remove a rear shock and get some measurements, see if Rancho makes a 9000 series shock that might fit. I put them on my Ram and am totally happy with them, in fact I have them adjusted for the maximum firmness and it sticks to the road like glue with absolutely no bounce. I carry up to 4000 lb loads in the bed of my 1500 with just an extra leaf and you'd hardly know it. It's going to thake some legwork, but Rancho makes them for GM,Ford and Dodge, good chance one of those might fit the Tundra?