Looked at this tractor & didn't see anything unusual about the tractor, except the push rods were 3/8 instead of 5/16. Had reversible draw bar instead of welded draw bar. On back of build card which was almost illegible did refer to a leak out of the transmission. Another notation looks like "no lock nuts on adj rod ?something? assembly". When talking to Carla at Case Company the first 80 numbered tractor was a 52 model and in this block of numbers, pertaining to the DC in question, there was almost all of the tractors had 5 digit serial numbers. I have a real curve I'm going to throw at you next week on a CI Case.