The few times I have driven my 641D in high gear on the road at relatively high speed, I thought it made quite a lot of noise. But I very seldom go that fast, and am much more concerned with how things sound in first, second and reverse, the gears I use 95% of the time I am driving the tractor. So how did things sound in the lower gears?
If the dipstick you checked was on the left side of the housing and a little behind the clutch pedal, that is the dipstick for the hydraulic system. My 641D does not have a dipstick for the rear end. There is a plug that can be removed to check that the rear end compartment has enough oil in it, and also there is a fill port like a barrel bung where you can add oil that you could look in. You don"t want the oil either to be low or too full. I have read that it is OK to use the Ford spec hydraulic oil in the rear end, but I choose to use heavier gear lube. It is possible that the rear end oil can get contaminated with water from rain or maybe condensation, so checking the rear end oil is something I do every couple of years--once I got way more than a quart of water out when I drained the rear end. That can not be good for gears and bearings.
Should you or should you not buy that tractor? It is hard to advise someone without a lot more information. If it is supposed to be a perfectly restored machine with a price like a perfectly restored and beautiful machine and that it is something that you might only take to shows, it would be of a much greater concern than a worker tractor for a couple of thousand dollars. Also, could you fix a rear end or transmission yourself, if necessary, or would you need to pay someone else to do the work for you?
Would I buy a tractor that made a worrisome noise? Maybe, for the right money. Every old tractor I have ever owned or operated has made worrisome noises on occasion...but a noise in high gear decelerating quickly from speed would not bother me much, since I just almost never go fast on a tractor. Good luck in your decision, and I hope you make a good choice!
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