The seal can be replaced without removing anything other than the linkage, Mike. You can try to pick it out with a small screwdriver, or an awl, but it is a metal/clad seal, similar to the rear seal, so it might be a bit difficult to remove. I have a tool that fits over the shaft, and "threads" into the seal to remove it...works really quick. You
might be able to locate the tool at a good parts house, you might not. The tool dealers
might have one on the truck.
If you can get the seal out, all it takes to install it is a 9/16" socket, and a small hammer. You can get the seal from a trans shop, or maybe even the parts houses. You can get one from the dealer, also, as this same seal has been used on every automatic 2-3-4 speed rear wheel drive GM product for many years...even today.
When installing the seal, you'll need to "coax" it around the flats(for the linkage) on the shaft...if you just bang it in, the rubber will fold back, and it will leak...
also...be careful if attempting to pound/dig this seal out...if you put a gouge in the case where the seal goes, it will probably leak at best, or break/crack the case at worse. If all else fails, you can pull the pan and remove the shaft. It doesn't require valve body removal. There is a nut that holds the internal linkage to the shaft, and a spring steel clip that looks weird that hold the shaft in position(in/out). Take the nut off, and slide/pry the shaft out. Then you can remove the seal with a screwdriver. Replace the seal, slide the shaft back in, tighten the nut, and re-install the weird clip.
hth
Adams' Apple2009-02-23 06:12:24______________
Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
