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I do this stuff for a living and honestly most the techs I know, myself included, don't even screw around with rebuilding drive shafts anymore. For a pretty reasonable fee I can have a driveline specialty shop replace the U-joints, carrier bearing, balance, and paint the damn thing and provide a warranty on their work. It is not worth my time to screw around with rebuilding them anymore. But, if you really, really want to do it yourself then yes, replace the center support and all three of the U-joints. I would use the GMBs or a set of Spicers if you can find them. Spicers are what came as OE in the 700 series cars. That compounded with the fact that the original patent that covered the basic U-joint as we know it today was originally held by Spicer back in the late 1800's. To say they know their stuff is a serious understatement. It is important to keep the unit timed up properly but I do not recall a 700 series driveshaft that you could assemble any other way, they have a "double tooth" set up where it splines together so you cannot put it back together any way other than correctly. Remember to order up the rubber support cage that goes around the center support bearing if you choose to do it yourself.
Mark
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