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Originally Posted by Italian LX
It has nothing to do with the "newness" of the bushing; it has to do with the different material used. If you replace the lowers with stiffer aftermarket bushings, then the stock bushings (even new ones) will flex more and cause the axle to move under lauches. When this happens, the stiffer lower bushings (attached to the frame) don't give and put additional strain on the torques boxes and eventually rip them apart.
You really need to do both upper and lower control arms at the same time and also be sure to use similar type bushings for both.
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Makes sense to me, mose abuse would seem to cause the stock upper to loose their effectiveness that must faster (especially as you pointed out with different materials) which would mean getting aftermarket uppers in the future anyway so why not have a matching pair. Thanks all for your input.
