Super T-10's DO have the larger (TH400) outtput shaft & fine spline input.
Dimensionally they WILL interchange,same mount/crossmember,driveshaft length,etc.
If you are in the habit of side-stepping the clutch pedal OR shifting WITHOUT IT,your Pontiac 400 or 455 is capable of breaking EITHER!
The Super T-10s with the taller low gear ratio's ARE inherently WEAKER.
SuperT-10's (for the most part) will be 10 years NEWER than MOST Muncies,so it's possible that you'll get a "tighter" or lower mileage unit.
Muncies shift a little nicer/smother than the ST-10.
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