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the effect of each of those items seperatley. When both items are combined there is an increased chance of 'driveline clunk'. The Center carrier bearing absorbs a lot of the driveline vibration, we don't disagree in that. The Subframe spacer stiffen the connection between the subframe and the main frame. There is less slack. The Aluminum models transfer 'more' noise through the metal, you creat a Metal to metal to metal surface (Subframe, Bushing/Spacer, Main Frame). Other materials 'soften the blow' but there is still noise transfered through. Now with both, the 1pc driveshaft will vibrate, creat more noise, resonate (whatever you want to call it) when put on load. In my personal experiance it happens when letting off the gas hard, but i've seen it in other situations. In this situation (letting off the gas hard), you generally feel some shift in the driveline (in the stock setup that is), this is exagerated with the 1pc driveshaft, and with the spacers the subframe can not make up for the slack. The lack of a 'soft' subframe imo causes the 'clunk'. Again it could be different in many cars as parts wear at different paces. Initially I assumed bushings were at fault, however changing out diff bushings, subframe bushings etc didn't solve the issues. I've seen this on numerous cars, either live with it or do without one or the other. Now i'm not 'hating' on either parts, or saying that they can't work properly together, i'm talking from personal experiance. I have both in my own car, and just live with the 'clunk', its less now with delrin spacers, but still somewhat there. If it can be fixed i'd love to find a way. -JokerF15
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