My question, why? I doubt they'll ever break on the street. Imagine how many of those rears went into all brands of race cars back in the day, with no changes.
I was thinking the same thing, how much power can the 23's take?
If you're racing a heavy car with 14" tires and dropping the hammer and dead hooking, then by all means go 35, no brainer. All else will suffice. Street car? Waste of money. "If" they brake replace with the 35 stuff. Chrysler did offer large diameter 23 spline axels (short and long) before the aftermarket axel guys got up and running.
