Hmmmnnn,Heh, Heh,
I took a good flashlight and a tape rule and crawled under the truck to see what I could. The frame has had a section added that appears to be 42 inches, the drive shaft to the carrier bearing [ cross member bolted in] is 42 inches c-c of u joint. Who ever did it was a pro. it is not obvious from the out side to the casual eye, it it butt welded with a 16" fish plate added inside the channel.[ 4 places ] I now think it has had a dump body as the end of the frame has been cut off and what I thought was a bracket might be a guide to keep the body in line. The pto plate on the transmission does not have as much grease and dirt as the engine/trans does.
The speedo shows 23 xxx , I am inclined to think it is 123xxx.
Thanks again.