Doesnt require any special tools, just a big socket I think somewhere around 1 1/4 inch..Just take off the nut and pull the yoke out, pry out the old seal and install the new one.
Watch out though, when you remove the yoke and seal some ATF will probably leak out.
If you do score it, you can just put a bead of rtv around the seal and it will be fine. Just make sure you put the seal in the correct was,ie not backwards, otherwise it won't seal and it will still leak. I made that mistake. Luckily the seals are cheap.
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