I'm working on my Dad's '57 420W with 5 speed, and two stage clutch. I can hear a growling bearing in all gears and at a stop when the clutch is engaged, and it goes quiet when the clutch is pushed down/disengaged. I'm thinking input shaft bearing(s)? Does that sound right to everyone? I know I have to split the tractor to remove the input shaft and I've never done that, but I've done a lot of mechanical work on cars/pickups. What advice would you give a person as far as supporting both parts of the tractor and the best way to move the two halves apart and then back together again. I don't have a front loader or A-frame or engine hoist to work with. Is it possible with just jack stands and a floor jack?