Dave;
Been almost a month since the last post on the "40". Have you made any more progress?
I replaced the complete under carriage on my Case 320 a few years ago. Was lucky to find a complete under carriage, minus tracks, from a Terra-Trac M-3 forklift in a local wrecking yard. Everything from the transmission to rails and idlers, plus a basket full of other parts. This machine had very few hours when someone threw a rod in it. I already had good tracks from an Oliver on the machine. I replaced everything from the differential to idlers and rollers. Paid $500.00 for the all the parts and sold all my old and left over parts for $275.00. Made a good cheap setup for it and now have 4 bottom rollers instead of 3 and a top roller it didn't have before.
Gene