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1pc and not a Z1. To be fair to Mitch though, I havent yet eliminated all variables before I can say for sure that the driveshaft is the
cause of the issue, but the symptoms sound identical.It used to shake/vibrate in the rear of the car starting around 45mph and progressively got worse with speed. I re-clocked it and it
magically mitigated the vibration to a point where the car was driveable in city traffic, but the vibration became noticeable at 65mph
again and got worse with speed. One issue I do have with the EPRacing shaft's design is the flange. It is too thin and sits too far into the "socket" of the rear diff.
because of this you can not use the curved 2-hole washer things that are used on the oem shaft because they will not sit inside of
the diff "socket". So, when you cast them aside and torque down the bolts for the driveshaft, the edge of the bolts mash down an
ever so thin 6 bits of metal on top of the driveshaft flange, making it damn near impossible to remove without dremeling them off. For
this reason, I wouldnt recommend the EPRacing driveshafts, ROYAL PITA. and a pic 
 "The American people will never knowingly adopt socialism. But, under the name of "liberalism", they will adopt every principle of our socialist program, until one day America will be a socialist nation, without ever knowing how it happened.... I no longer need to run on the Socialist Party ticket because the Democrat Party has now adopted our platform."
--Norman Thomas, 1944 Socialist Party Presidential Candidate "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery."
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EXACT same issue here, although mine is with an EPRacing - 
