Hey Homer, sorry to hear about these problems.
I've been lucky with my '00 Sport, its only been in once. The transmissions are the weak points,.
There is a mod which will make the transmission start with OD off, instaed of on, you might want to ask DTT about that. Dtt knows their crap!
Have you changed out your coolant? Its more important for diesels than gas burners.
I'm going on 65,000 on mine, but after this I might see if I can buy an extended warranty..