I would recommend NOT trying to rebuild a PS box. I've had a couple of friends try it and say they would have been better off just getting another one.
I personally use $15 junkyard ones which seem to last about 5 years each.
My last saginaw box felt like there was a chunk of something getting stuck in the gears inside of it as you turned it...yikes!
Of course, 5 years of hard wheelin with 36s and 35s tend to do that kind of thing to steering boxes. <IMG SRC="smilies/biggrin.gif" border="0">
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