Zevox, search under MADDOG.. I believe he has a diy thread on how to change thermostat that I followed. Its very easy to do, but do a search or dont be afraid to ask. Sorry to hear about the AIT sensor. As long as it still seals up tight, I would think you should be fine.
edit: if you do decide to do the tstat swap.. heres one thread start with if you havent seen it yet http://ramforumz.com/showthread.php?t=60974&page=3
nice truck you have by the way!