Hmmm. check the front axle, front wheel spindles, and steering linkage/operation for any damage or bends. I had similar problems on my LT1000, and it turned out to be the crappy stamped steel axle welds giving out.mxdriver,
You have the same model? Does yours turn sharper to the left than the right? I can get about a 20-24 inch radius turning left and about a 48 inch radius turning right...Is this normal or should I go digging for a potential problem?
Your machine is built like a tank though, with a cast iron front axle (i believe)? So just give a good look around.
Great find by the way. And that 6-speed tranny is indestructable...