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Robbie Welch · 08-25-2016, 08:18 PM

Tom, and Jeff thanks for responding, I talked to a rep from PST and with the data I gave him he recommend and aluminum 4". He said with the Leigh and diameter of my drive shaft the critical mass was at 5500 RPM. I've been dealing with a vibration around that RPM for a while. I've replaced the yoke new joints and rebalanced the drive shaft and its still there. I think he said and aluminum 4" diameter that long critical mass would be 7700 RPM. I don't know if he was just blowing smoke up my butt or not.

08-25-2016, 08:18 PM	#4
Robbie Welch Live Reporter Join Date: Sep 2005 Location: Golden Beach Maryland Posts: 1,232 Likes: 52 Liked 262 Times in 124 Posts	Re: Lets talk drive shafts Tom, and Jeff thanks for responding, I talked to a rep from PST and with the data I gave him he recommend and aluminum 4". He said with the Leigh and diameter of my drive shaft the critical mass was at 5500 RPM. I've been dealing with a vibration around that RPM for a while. I've replaced the yoke new joints and rebalanced the drive shaft and its still there. I think he said and aluminum 4" diameter that long critical mass would be 7700 RPM. I don't know if he was just blowing smoke up my butt or not.