It's probably coming from the pinion/ring gear. The transmission is actually making noise in all gears, but you only hear it in 5th on account of the much higher RPMs.
Most likely cause is misaligned gear mesh from worn bearings. But it also could also be from improper pinion mesh adjustment when the transmission was assembled, or simply (unlikely) the ring/pinion have worn out.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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