Check your trailing arms!

[MikeyMan]

Good catch and nice job on the repair!
My first truck was a '69 C/10 long bed I owned in the early eighties. Mine had a large rust hole in the middle of the I-beam part. Eventually the trailing arm weakened and twisted causing the rear axle to move. With my teenage lead foot and a 3-speed, I had serious drive line problems. Ended up getting a replacement trailing arm from the junk yard. Had to remove it myself without power tools or torches, just a socket, breaker bar, pipe extension, and a hacksaw.