The 5th gear ( overdrive ) is in the extension section of the box and has a bearing in the housing on the end of the lay shaft
The noise may not be a bearing as the noise described is for mismatch of the gear mesh or chipped tooth on the overdrive cog
so the end section of the lay shaft has a bearing either side of the large gear on the lay shaft as it drives a smaller gear that is connected to the out put shaft by a syncro dog that is moved on gear selection
check the viscosity of gear oil in use as the manufacturer specifies very light mineral oil and that allows tooth contact and wear if carrying loads ( towing ) or speeding
I personally use OEP 80/90 gear oil in manual transmissions , same as what has been in use for many years
SOURCE: 5-speed transmission making noise in 3rd and 5th gear
are u sure the alignment (side to side, up and down) of the trans on the bell housingis not out of spec, that will burn the bearings out very quickly.
SOURCE: jeep wheel bearings and rear carrier bearings
As long as the diff itself was not noisy and there aren't a bunch of metal flakes floating in the lube, I suggest you pretty much leave the carrier alone. Just do the axle work, use good lube in there and be done with it.
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