I have a '59 chevy 1/2 ton SWB. Both of my spindles have seen wear do to the ball bearing set-up. The inner bearing races spun and the outside bearings ran on the spindles making little grooves. I need to get new spindles because I want to keep the i-beam axle. I'll be using disc brakes up front.
You could try these http://cgi.ebay.com/ebaymotors/1955...ryZ33586QQssPageNameZWDVWQQrdZ1QQcmdZViewItem but talk to the seller first. He claims that they are for "'55-59 GMC 1/2 & 3/4 ton" while my GMC Master Parts Book shows different spindles for 1/2 and 3/4 ton.