37s will make a huge difference! i had some 35 inch claws(about 1/4 tread left) and i put some 37 MTRs on and WOW what a huge difference! i gained 2 inches between the ground and my skidplate! exo is a great idea, get lots of pics when u do it. i just graduated from Wyotech not to long ago. i took the chassis fab class and thats where i built my exo. me and a buddy did it. give me a holler if u got any ?s.