My streamliner project is mid-engine (behind cockpit,forward of rear axle)and 4 wheel drive .In the area where the front drive shaft passes along the outside of the cockpit, I`m planning on having the shaft and all couplers inside .250 wall d.o.m. tube w/ smaller dia. tube inside mounted with 1/4 in. bolts. My thinking is the smaller tube will act like the liner in a T/F drag car clutch can and spin . Thoughts/ Comments? J.B.