| Subframe spacers. Talk to driveshaft manufacturer's such as powertrain industries, driveline of san jose (they do precision balance work here in the silicon valley and are highly regarded), as well as numerous other builders around the country. It is *NOT* a design flaw of the spacers but more or less a the driveshaft. The 1pc driveshaft will never 'feel' as smooth as stock, the 2pc shaft can 'soften' the blow much easier and takes advantage of the center bering. When using Subframe spacers, there is less 'slack' between the main frame and the subframe. Now any clunk, vibration, etc from the driveline is exagerated through the car. There are little steps that make it 'better', obviously a properly balanced driveshaft, delrin or urethane spacers, or new urethane subframe bushings. Actually delrin spacers seemed to work extremely well for me, urethane works except doesn't help with any wheel hop issues =\ (effectively making spacers useless). I've seen this on cars with NEW bushings, everything from the Subframe bushings to the diff bushings. But again every car is different in slight ways. Some are worm more than others etc. There are at least 2 local people that I've talked to that had similar problems, removing the spacers (or driveshaft) fixed the problem. There is a connection whether people choose to see it or not. -JokerF15
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