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5th gear noise in 39 H

If you're only getting noise in one gear. I would guess it has a tooth that is chipped very badly, or maybe even a tooth missing. I would suspect a bad bearing if it had noise all the time, or only when gears were turning.
 
No reason for more noise in fifth than others except for turning at higher speed. If it whines real bad you may want to check the rear main shaft bearing, differential carrier bearings and if the ring and pinion mesh has changed because of a bad one. If it shifts into fifth good and stays there the front main shaft bearing is probably good enough to not cause your problem.
 
The broken tooth whines on some, but on an H or M or Letter series, the noise will be a tick or rapid click. Fifth is direct, and only the differential and finals are powered. Jim
 
Since 5th gear is "direct" (power goes straight through the transmission to the output shaft; no gears are involved) the noise has gotta be coming from the rear end gearing. And you only hear it in 5th on account of the much higher gear speeds in 5th gear.

If the sound is a whine, either the output (pinion) shaft bearing is bad or the pinion/ring gears are worn. A deeper "rumble" would be the final drives (differential pinions/bull gears).

As others mention some degree of whine/rumble in 5th is normal for these tractors. Remember the transmission/final drives are engineered for strength/durability at slow speed - not quietness in road gear!
 
What weight oil are you running? These old tractors have been around. I find 75w-90 weight to be too thin for most. 85w190 is what I run.
 
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