My input and output shafts have 850+ passes. Though all are footbrake. I've broken 3 Dana pinion gears. Dizusters turbo car also ran stock shafts. Its broken rear axle pinion shafts, aftermarket steel drive shafts. But never either trans shaft, Both were over 850 hp. His weighed 3750, mine 3350. Both are 65 push button. Both have stripped stock front planet carriers. Both run stock pump gears.
Doug