You can sand the shaft slightly, but if they are deep then sanding it wont help, but worth a try. And I am not even sure on the greasing part. I mean you would normally put some ATF on the seal where it contacts the shaft so it goes on with out rolling, but I haven't heard of putting grease anywhere on it. Overkill should explain more I suppose.
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If it is so bad that you sand it smooth but have a gap at the seal where fluid will constantly drip then grease will form a good enough seal to drive it for a while. I am only talking 1000 miles or so. But you will still need a new slip yoke. The grease will sit in that concave part of the seal and keep in the atf for a while assuming it isn't horrible. If it was that bad right now though I don't think we would be talking about this.
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