Did you actually read what I wrote? Because I was talking about an aluminum shaft, not steel. I have no doubt my math is correct on this one.

Show me a production car with a 3" OD 0.125" wall thickness aluminum driveline over about 65" long that is capable of over 4500 RPM shaft speeds. Because with the evo gearing, the critical speed would happen around 85mph.

Then you will have proved your point. Until then, you're just guessing. I at least have sound engineering principles guiding my judgment and not just speculation.

I could care less about your 3" diameter 0.125" wall thickness steel shaft that weighs as much as the stock 3 piece. Yeah, I'm sure that tank is fine. The rest of us are interested in LIGHT driveshafts though.

 

actually I did read what you wrote. you did not state material in you statement. you simply stated you cant make one piece shaft. and I clearly stated the one piece I made was steel.

 

I did mean aluminum and stated as such implicitly shortly after the first statement. However, I do see your point that I did not explicitly say aluminum in the initial statement.

That said, the first post does specifically ask about a 1-piece aluminum shaft and thus the reason I answered without an explicit reference to aluminum.