My car is vibrating in such a manner as to suggest the center bearing or its mount are probably shot. I suspect that the entire driveshaft should be removed for this work hence I'd like to fix everything. Some questions on what I need from FastLane. A drive shaft bushing? I see it at the site, do I need this, what's it do? The driveshaft support boot. What is it and where does it go? Flex discs, same frt and back?
General procedure I was thinking of following, undo rear flex disc and center bearing support bracket. Does the drive shaft slide apart at this point? Then I was going to take oof the front flex disc. I'll paint some line-up marks on the driveshaft for re-assembly. Sounds easy here but I think I'm going to be one dirty, unhappy puppy underneath the car. Is having a car up on 4 jack stands stable or dangerous?
Thanks for any and all advice.

I highly recomend you paint a stripe between the two halves where the splined slip joint is. and I mean paint..not tape..or majic marker.

You don't want it to be even one spline off.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

You are.

I spent the better part of a day underneath the SDL doing rear spring pads, subframe bushings, and diff mount. It's definitely not fun.

Four jack stands is perfect. I only have two, so I put the front of the vehicle on four inch cement blocks under the tires and put the jack stands at the rear jack points on the body. Very solid support on a level concrete floor.

If you have to put it up on a surface other than level concrete, then it gets more dicey with jackstands, becauase they have a relatively small, and sharp, footprint.

I raised the rear of the vehicle as high as the hydraulic floor jack would go and set the jack stands. The stands have quite a bit more travel than this, and, if I had to do the drive shaft, I might block up the jack and lift it another four to six inches. The normal lift on a jack gets the body about 16 inches above the pavement. This is no fun for a large man.