Classic/Antique Car Repair: Steering Gear Box Leak, sector shaft, needle bearings

Question
I have a 1958 Impala with a leaking steering box. I believe all the leakage is around the sector shaft. What is involved in changing that seal? What is the proper oil for the box?

Answer
Allen  try these 2 links http://www.chevychevy.com/pages/58_Chevy.htm

http://www.classicperform.com/fullsize.htm#Power%20Steering%20Kits%20&%20Compone...

Its for parts only but most leaks I ever dealt with came from control valve or slave and their pretty easy to rebuild.
You had me on the sector shaft if that is case, its got a bunch of needle bearings, seals etc within pump I could only say to get it on bench and take your time.

I'll look for rebuild kit but whole unit is $299 on classicperform

Mike