stuborn nut driving me nuts

is anyone familiar with the lower nut on a gear box mounting bracket on an late type 3 gear box.its the nuts that bolt the box to the bracket.No socket etc can get in there is there a easy way out of this.or do i have to weld a socket to a bar?help

I'm not sure where you mean... do you mean at the nose end?

Have you tried an open ender?

gear wrench spanner?

Gear wrench spanner :got it of thanx dudes.