First of all, welcome grafhx.

Jumping dunes could be the problem. That kind of wheelin will put a shit load of stress on the IFS and especially the diff, CVs and hubs.

TC kit is good stuff but might not be your cure, especially if you plan running 35's. Those are big tires, so a lot of rotating mass = a lot of force when they finally hit the ground and get some grip.

You're likely to not break as much stuff if you go slower, as others said. Speed = Force = more stress = higher chances of breakage.

Stop by MXO, I see that you're smack in the middle between us nothern folks and some no less active southern city dudes as well.