Lets talk drive shafts

[Tom Goldman]

Robbie , I would not put a aluminum shaft that long in a car as heavy as yours with a trans brake .
You would need to go to a 4" diameter shaft for one that long.
I'd recommend a 3 1/2" chromemoly shaft for a car like yours
The performance benefits of the aluminum shaft on Super class cars are minimal compared to cost and longevity.

[Jeff Stout]

I think my g body is 52 long maybe 54 long. It's a mark Williams 3.5. Hundreds of passes with small and big block. Small tire and big tire with no problems.
I removed 14 lbs from drive shaft and rotating in rear end and zero et gain.

[Robbie Welch]

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]

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!