More often than not, broken driveshafts are the result of poor suspension/driveline geometry, inherently weak suspension parts, overtightening of the U-bolt straps, or using Band-Aid brand devices, such as transbrakes (strictly race-car stuff) that has absolutely no business on a street-driven car. Revving the engine into the RPM ionosphere and letting go of a button that redirects the oil to produce a better 60' time is a vain attempt to compete with strong engines that can do it without all of the shock-loading. Hydramatic didn't engineer their street automatics to endure this phenomenon; neither did factory driveshafts and U-joints.
The infamous driveshaft that imploded at Evadale was probably due to the aforementioned and not power. If it were power, Mali would be producing trap speeds comparable to "IROC-X"
frenchy- shut the hell up -- Jen, 21:10:29 05/05/03 Mon