The GM PowerGlide transmission is a tried and true tough unit & does not “just break driving normally from lights”. But it does have limitations. It won’t accept being shifted from a forward gear to reverse or to neutral and back to a low gear under full throttle. Older cars have shifters that may not protect against shift errors. Always invest in a quality race type shifter, to prevent damage from shift errors. Torque converters also need special attention if they are to be used in high power applications. Many are made from units designed originally for power and torque ratings of 50’s & 60’s engines. A cheap option will cost a lot if it fails. Take advice on recommendations for your application.
Treated with respect this transmission will give years of reliable, trouble free & fun operation.