Which kind of t-case are you looking for? The Pro-Fab chain drive or the good old regular Rockwell's?
If you check into the Rockwells, they are available in 2.5 and 5 ton. Also available are the air shift versions, too.
The Pro-Fab's are more the modern day monster trucks where weight reduction is a must. I would not use this for any other than racing because these types of t-cases are a single speed only. A direct 1 to 1 ration. If you check into the Rockwells, you have the options of low and high range just like shifting regular light duty trucks. /forums/images/graemlins/thinking.gif