Where do you add transmission oil in a Ford 3930 tractor?

To add transmission oil in a Ford 3930 tractor, locate the transmission fill plug, which is typically found on the top of the transmission housing. Remove the fill plug and use a funnel to pour in the appropriate type of transmission oil until it reaches the recommended level, as indicated by the dipstick or sight glass, if equipped. Always check the owner’s manual for specific oil specifications and capacity. After filling, replace the fill plug securely.