Lets talk drive shafts

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.

Keith 944 · 08-25-2016, 09:02 PM

I bought a MW aluminum shaft when they used to pay contingency it is 3.5 or 4" can't recall but it is bonded, with their yoke, been in car over 15 years now. I kept the steel one I made as a spare. I remember that it was no gain whatsoever. but if you have a vibration now, what is there to loose? Maybe some $ but you will have a spare!

08-25-2016, 08:18 PM	#1
Robbie Welch Live Reporter Join Date: Sep 2005 Location: Golden Beach Maryland Posts: 1,234 Likes: 55 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.

08-25-2016, 09:02 PM	#2
Keith 944 VIP Member Join Date: Feb 2006 Location: Dela-where? Posts: 2,192 Likes: 1,159 Liked 1,873 Times in 576 Posts	Re: Lets talk drive shafts I bought a MW aluminum shaft when they used to pay contingency it is 3.5 or 4" can't recall but it is bonded, with their yoke, been in car over 15 years now. I kept the steel one I made as a spare. I remember that it was no gain whatsoever. but if you have a vibration now, what is there to loose? Maybe some $ but you will have a spare! __________________ KEITH MAYERS 2-1/2 X somebody Still many X nobody