Just bought a T bucket with what the po told me is a 1950's GM pick up axle. I found this number on it: 3833377GM8 If anyone can tell me what year pick up that's from I'd appreciate it, or at least point me to a source where I can find that info or tell me what to look for on the axle to i.d. it. Thanks.
That number doesn't show up as a pickup axle from 57 or earlier. Probably a 60's vintage G series van axle.
The steering arm does not look like anything 49 thru 54 truck to me anyway a little better picture would be more helpful.
This site gives kingpin to kingpin dimensions which might help narrow down your search http://www.droppedaxles.com/CHEVY_AXLES.html#TXTOBJ7D8154322312261