| short answer ..No Rob you've been over this before . Steel's fatigue limit is usually pretty close below its ultimate tensile strength, but aluminum's fatigue limit is way below it's ultimate tensile strength. To us that would mean this-
A steel driveshaft that is able to hold 800 lbs of torque before it snaps might be able to repeatedly endure launches that stress it to 700 lbs of torque without weakening. An aluminum driveshaft might be able to hold the same 800 lbs of torque before it snaps but due to aluminum's low fatigue limit it may only be able to repeatedly endure cycles of 500 lbs of torque before it begins suffering metal fatigue. Enough cycles of 600+ lbs of torque and that shaft's going to eventually snap. but in saying this ..daily driving with spirited driving you are not going to break it.
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