It's funny that I found this thread. We just replaced kingpins in three tractors here at the shop(International 9100's). The procedure that Denny described is PERFECT. We don't hone our spindles. Just polish them up. The fit should be a hard hand press. The pins we installed here we also had to install inner bushings. Top and bottom. Pressed in. One thing that I like to do is wipe down the kingpin with a very light oil. It helps to slide in the spindle. Other than being an 80,000 pound truck, sounds like an identical process.