i recently swapped out the 18 spline trans and subbed in a truck od trans on my 70 charger for a cheap od because i drive high speed hiways often.I used an old swap meet clutch and PP I had laying around(23 spline).Anyway since the swap I now have clutch chatter so gonna pull the trans and swap in another clutch...is the chatter being caused solely by the disc or could the pressure plate cause it? I`m assuming its the disc and was planning to just swap in a disc only......