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Dynatrac also makes ball joints. They are more expensive, but can be rebuilt and from what I have heard will last you well over 100K.
Good luck.
Originally Posted by luxury
This thread describes the ball joints in fantastic detail complete with pictures (follow the links inbeded in the text), including the tool you can make from iron pipe to press the seal on. I got the complete kit with all seals and Moog ball joints from Your Premiere Source for Ford Truck Parts | Powerstrokeshop.com (search the common part catalog for "ball joint kit").
A word of caution, if you live in the rust belt, be prepared for corrosion issues. I had to grind the nuts off of the upper ball joints and I broke a puller trying to get the hub off one side because there was a lot of corrosion on the 4 hub bolts.
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