If I recall the TD15C has no steering clutch packs but brake pads that put a gear group to act, I have rebuilt these transmissions and they are some work to tackle, 1 transmission I did had the filters under the floor plates, the other had the filters etc in the side near the shift lever, I can recall that there was 100 in total plates in the packs that I had supplied to me from a company in the U.K. that were shipped in from Germany, the clutch pack seals that seemed larger than the drum I also had Lathe cut for me in Germany, the cost was around a 1/4 of the cost from the U.S. to get the transmission out involved removing all the hydraulic set up for the blade, the transmission is bolted in with only a few bolts but they are pigs to get at some of them, there is a multi control valve block bolted to the top of it that has all the pipes going to the hand control, the transmission itself has a simple 2 speed mechanical section and I think its built by Rockford? I might have posted pictures of the job in Shop Talk, look for my name on removing sprockets.