| I have two old school z1 driveshafts (prior to the platinum) Working stock unit > Z1 Busted center bearing/U joint on stock < Z1 On both of them, I get a slight vibration at around 40-50 then again with a significant vibration at speeds over 80 up to 100. I haven't ventured much higher than that, but i'm pretty sure it continues from there. This is after clocking them both 3 times to try every possible position. One is being dropped off at a local driveshaft store for balancing. On the working stock unit, there is also a slight vibration, but it would say it's much less than either Z1 ds's I would not buy another one from Z1 again.
Alex 
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