I wouldn't think long. They will last longer if you per load the the car before dropping the hammer on it, brake torquing. It's usually the quick snap of the gas pedal that gets them.Here is a question I have. The car I put the 440 in was a 383 car. But the rearend is, I'm pretty sure an 8.25. Wondering how long thats going to last with the 440 twisting it? Did they put the 8.25 behind a big block?
Anyone know of a good place to have a driveshaft made?