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My latest project is restoring a 1976 D250 to good working condition. I've come across a stumbling block that I could use a few opinions on. The engine runs smooth and starts right up even in freezing weather. The tractor is in relatively good mechanical and cosmetic condition, but there are a few things which were obviously overlooked or neglected over time. There is a vibration in the drive train that rears its ugly head, mostly when the tractor is cold and when in the low to mid RPM range. I can feel a little bit of play in the U join closest to the motor, but there is also a bit of play in the coupler or possibly the bearing at the shaft entrance to the transmission. The clutch plate was recently replaced and is solid. I have a good industrial power transmission place nearby which has had all of the bearings and seals I needed, so far, including metric. I also have a place nearby that services and builds custom driveshafts. So, I’m confident I can get what I need; it just need to figure out what my approach is going to be. I don't have experience repairing drive lines. Has anyone worked on replacing any pieces in the drive line on a D250? So far, I intend to replace the U joints in the driveshaft. That seems like an obvious step. I also was considering having the driveshaft balanced once the U joints are replaced. The biggest unknown to me is the play where the driveshaft meets the transmission. Does anyone have a solid D250 they would be willing to climb under to check the play on that shaft? I have no sense for how much play is OK, or if this is something I am going to have to take care of, right away. Based on all of what I have read about the early D250 transmissions, the play at the transmission has caught my attention. Also, if anyone happens to know the size (dimensions by numbers) of the U joints needed, having those would help speed up the repair process. Thanks for your thoughts.
