Final drive leaking

Did you undo the clamping bolt on the bottom?

The old standbys............penetrating fluids.............take your pick
............................heat on the "nut" itself to expand it and break the bond with the underlying threads
............................Big hammer...........well, nothing over a couple pounds......tap on the nut with a drift to attempt to move it around......some folks like an air chisel with a blunt punch to try to vibrate things loose.

Are you turning it counter clockwise to tighten the bearing? Bearing might already be tight. The instructions I remember said to tighten as much as possible with a 5' cheater pipe on the spanner. Have you tried backing it off by turning clockwise?

Yeah it may be as tight as it will go. I was trying to go counter clockwise. I used the 5 ft cheater pipe. Then pulled that with the backhoe bucket... Nothing. Except a broke spanner wrench.. I need to try clocKwise. I was thinking about using a thicker oil to slow the leaking.

If there is no slack in the bearings, just put in thicker oil, don't use heat, you will burn the rest of the leaking gasket, and probably, the bellows seal as well.

Thank you for the help! I'll try some 140 weight.