Howdy,
I had the Kingpins replaced in my F-600 front axle a few years ago. Initially, I was going to do it myself. I discovered that I needed to install oversize pins due to corrosion. I was able to get an oversize pin kit from Napa who got it from Rare Parts.
I also found out that to get the new pins to fit correctly, the holes needed to be honed accurately too.
It didn't appear that I could do that by hand (people claim to be able to do it though) I didn't have a hone either.
I ended up taking the axle to a front-end shop in Kent Wa, (American Frame & Alignment Inc ) and they used a Sunnen hone to fit the pins. I then put it all together. here's an example: http://www.youtube.com/results?search_query=Kingpin+automotive+part&orderby=relevance&lr=en
Once lubricated and installed, the new oversize pins turned like they were in roller bearings! I don't think I could have done the job as well by hand. The actual labor cost was something like $150 or so.
The tighter the kingpins fit the smoother and tighter your steering will be....... Don't want no drunk monkeys driving my truck!!!(trunk monkeys are ok though!

)
Cheers,
Rick
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1955 F-600/272/E4OD// Disclaimer: No animals were injured while test driving my F-600 except the ones I ran over intentionally!
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