This truck axle has a track width of 60.5 inches. The 63 has a track width of 60.3 inches, so it may fit well as is. The spring mount of this axle is the same width as the frame of the 63 not that that makes much difference as I will build a new frame anyway.
Funny i was once called not a friend from a guy that i really thought was a cool guy. I asked him why he Thought that and said you just dont like me. I never ever did anything to him. I just told him ,well if Thats the way you feel ok . I just walked away. He had a tool truck at the time when he told ne that when i was on his truck, but i knew him before he had the tool truck .