I have found the quality of the chinese roller bearings to be suspect. Make sure all your tollerences are within spec. I have had varying degrees of success or failure with the roller bearings. The bearings on the passenger side lasted 30,000 miles while I went through 3 sets of bearings on the driver side in the same time frame.
I have ongoing issues with the conversion. I bought several other axles off craigslist to mix and match hubs, spindles, etc. I currently have a front axle at the machine shop to have new king pins installed. If the spindles don't check out right, I will likely have to send them off to be welded and ground down to factory specs.
My truck is a 59 gmc 1/2 longbed with v8 and 31X10.5 tires on 15X8 steel rims. 6 lug disc brakes on Factory axle with Factory power steering option.
