What's your gear ratio? I've got 3:73 w/ 35's. Burned my old 700r4 up because it was overheating on the trail. I found someone local off craigstlist to rebuild it for $700 (labor) Told him what I was doing w/ the truck and he suggested all the beef parts that I had researched in old threads here.
Had him put it in and I added the Perma-cool trans filter that's tapped for a temp gauge + a Derale cooler w/ fan and bypassed the stock cooler.
So far so good...
W/ my ratio I only use od on the freeway. It cruises around town at 150-160 degrees, 180 when its hot, which is where the fan kicks on. We have a lot of hills.Towing my boat in town will get it up to 220. It's really nice to know whats going on.
Do a search, there's a mtn of info about how to care for a 700r, rebuilds and bowtie, tci etc