Thanks Carpenterman,
It just seems to come down like a rock when I hit a pothole, Just very hard. no crazy noises or anything, just hard. I have new accumulators, a valve rebuild, and a pump seal kit coming next week. I am going to tackle the SlS valve removal this weekend. I was going to skip resealing the pump, and hope that my fluid was just "dirty" but fear I may have a bad seal in my pump too since the color is so dark and looks like oil is getting in. All said I'm in $90 for the valve (dealer), $206 for accumulators (********) and another $75 for fluid and a filter. A bit pricey, but I only want to work on this system once if possible. A lot of good links over there on the diesel forum. Thanks for your advice.

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1979 300TD