Did some maintenance to my 106 yesterday. Running pretty good; PTO was making a strange sound but after I engaged and disengaged it the sound went away. However the trans sounded a bit excessively loud in 3rd. When I got back to the barn I opened the fill plug on the rear cover and........
IMG_20210228_125511.jpg IMG_20210228_125448.jpg
Ya think I oughta change that fluid??

The tractor has been running whatever was in that rear axle when I bought it. Hadn't ever been an issue until just now actually. I would assume, being a gear drive, that most standard gear oils will work without issue here?
On a side note, going to pull the fender pan and then open up the gearshift panel. Make sure everything on the top end is in good working order. Probably fill the trans with new fluid from there too, so that it coats the gears as I fill it.
NOTE TO SELF: Always check the fluid in the rear axle on a new to you tractor!!!
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147
R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)