7 1/4 why weak?

i had a stout 340 in my '68 dart, it had a 4 speed. heavy duty clutch.

one time i did a launch and it broke the yoke right off. was an 8 1/4

it would be the same deal with a trans brake or very high stall converter with foot braking. the sudden impact is what breaks stuff.

if you just have a stock auto and stock converter you will never hurt it. depending on the engine specs, i bet a u-joint would fail first.