People break t56 transmissions at less than 300hp everyday. Its pretty easy to yank it into gear and “break” it. Yet in stock form they will hold over 800ft lbs all day long. Usually its a clutch or driver issue. My saginaw 4 speed was speed shifted behind a beastly powerplant and never broke during a shift but rather when the power came on rolling into it with tons of torque in a turbo setup. If your clutch releases clean and your shifter is set up right it should have no issues. I wish my T56 shifted as good as my old sag 4 speed. I have a video on my phone of how i treated my 4 speed but i cant really post a vid on here. Mabey i will put it on YouTube and link it.
