Would sugest a marlin 1600 over a 1200. It may be over kill on your truck, but in the mud with 38's you want all the grab you can get.
I would recomend the the 1600, or the 1200 ceramic. I have the 1200 ceramic and it will hook up always. Sever use, and extream temps mean nothing to this clutch, it will go. The only bad part is its REALLY touchy since it hooks up so tight. After driving it for ~700 miles I am beging to love it!
PZ
that's what I'm saying i want (need) cause I'm strictly off road .
you mud or rock crawl with your's or mostly a dd?