I recently purchased a Kubota B7000DT with a FEL and a tiller. Being tractors are expensive and difficult to find around here, I paid a premium for this grey market tractor. I have only owned it for 2 months and have moved 15-20 yards of dirt so far. I have had to make 1 repair. I broke a tooth(19 tooth spur gear) in the front gear reduction unit and had to run 2x4 for a few weeks while I waited on the part. I broke the gear while in low reverse backing out of a hole with a full bucket of damp dirt. In 2x4 ops I realized just how much the tractor was front heavy with a load of dirt. I had almost no traction at the rear wheels. I loaded 300 lbs of sandbag on the tiller and put 14 gallons of antifreeze in the rear tires to balance out the load with great success. 4x4 has been fixed and what a difference in traction. I am concerned about some chatter coming from the throw out bearing and the clutch pedal travel I would also like to switch out my r2 tires to a r1 pattern. I have read some threads that say the rim also needs to be changed and some that just mention new rubber only. Has anyone changed their tires to standard r1 5.00-12 and 8-16 ag tires or switched to other sizes? also, does anyone have the part numbers for the clutch components? i think its going to best to replace what I can get while I can get to it.