1953 Suburban wagon, has a wobble over 50 and two U joints with out boots Took my driveline to supposedly "The place" to do drive lines in the SF east bay area and had to call them back to get the following information Those drivelines suck they vibrate and they are a pain to do - we will build you a new one with our components for $478! Well I made a few phone calls and found someone else who will re-do my u-joints with the parts I already have and spin & balance the shaft for $200 So not being an expert but kind of being a cheap old B@st#rd or COB I am inclined to go with the last. Is there any reason not to rebuild the original?????
Of course if the OP is planning some mods then a new shaft would be part of the swapping... Rebuild what you have unless there is some physical damage. .