Here's the tool I made to get the nut off. Kind of followed Phak's model but I welded an old nut on the back side for a socket. The nut had been loosened/tightened before with a cold chisel. Got the nut off the old junked 59 panel in the woods to use as a template. The pins are 2-3/8 in c to c. Worked like a charm. Now to find a cheap 1/4 in bar type torque wrench.
~~ Jethro 1954 3100 Back to Life In the Dity Gallery 1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020