hey i have a 91 tracker gonna throw a turbo diesel in it. now should i stay with the coils and upgrade em. or is it gonna be worth it to rip it all out and go solid axles and leafs?

What is the planned use for this rig?   If it's a DD then I wouldn't switch away.  But if you plan on going to Toyota Axles and 35" tires and everything then a whole new suspension might be your thing.

Before diving into the Turbo Diesel conversion you might want to check out JLuck's build at http://www.zukiworld.com/forum/build-diaries-how-to-diy/sidekick-turbo-diesel-build-(then-rebuild)-picture-thread!!/ to see how far he made it before switching over to an Audi Turbo.