Cut down prop shaft? You mean driveshaft? My driveshaft was made from scratch and balanced. My car in 3rd gear will go 117. I usually cruise at 62ish in OD. 78 tops..
Propeller shaft = driveshaft
Made from scratch & balanced, precisely what I'm suggesting, & by someone who knows what is appropriate for the intended use & maximum stress/RPM.
Your choice of cruise MPH isn't every ones, and your choice to not top end Your car in OD is as well. We are discussing 273's car, not Yours.
