I've owned a 1943 H for 20 years. It was in rough shape when I got it and I haven't done anything as far as restoration, just fixing things as I'm able or if the need arises. It has been in my mother's barn for the past three years (until recently). I need to state that the transmission is in need a lot of repair. It is extremely noisy, even just in neutral with the clutch out. It sounds like bearings. It has 90 weight in it but the transmission sounds dry. There is no 4th gear whatsoever, at least to say the lever won't go into 4th. In second, if I coast or otherwise don't have a load on it, it sounds like someone dropped a handful of marbles inside the transmission. I do plan to go inside the transmission next summer sometime. I was fortunate enough to crack the transmission cover bolts loose without incident. I do realize I don't know what I'm doing but I will take my time and lean on youtube heavily. Earlier this year I started it and let it run a while. As soon as I started it, I saw what looked like spray foam insulation coming out the bottom of the clutch housing, except it was black. It reminded me of goose poop. I scratched my head and told people about it but I think they thought I was losing my mind. A month or so ago I decided to bring the H to my house, 1-1/2 miles away. I went to start it and the starter did not work. I removed it and the bendix was packed with black gunk. I had to clean it out with a screwdriver to free it up. I then reinstalled it, started it, and as soon as I stepped on the clutch pedal I knew something was wrong. It felt like I was stepping on a half deflated ball. I managed to get it into gear and drive it out into the daylight. I removed the inspection cover from the clutch, laid a towel on the ground, and proceeded to pull approximately 5 lbs of black gunk out of the clutch housing. It looked like what would come out from under a lawn mower except black. As I dug it out I saw more evidence that it was likely a massive mouse nest. There were seed hulls, mouse poop, etc. I got what I could out and drove it home. The clutch didn't feel right but I made it home. I don't know if this was stupid or not, but I cleaned out the clutch housing as best I could with a pressure washer. More pounds of stuff came out. I started the engine and sprayed up into the housing with the pressure washer while it was running. More gunk. Once I was happy that I got as much as I could, I stopped. I've driven the tractor around the yard a couple times since then, and the clutch was "grabby" a couple times, and very slow to engage a couple times. Today I started it just to move it so I could mow under it, and it won't move at all. Nothing. I will say I have not smelled burning clutch at any time. I don't know if the mouse gunk glazed the disc or if I destroyed something in my effort to de-mousify it. Immediately I had visions of trying to split a tractor when I've never done it. I've since read that the H's clutch can be replaced without splitting it. I've also read some steps can be frustrating. Does anyone have a guess as to why the clutch would just go from good to bad in a matter of days, while spending most of it's time sitting on the lawn not even running? And as to replacing the clutch without splitting the tractor, what's your thoughts on that? Thanks for your time. I know I can be long winded.