a driveshaft is a driveshaft until you start going 4340/4130 tubing, tig welded yokes, and cryo'd parts. i have never seen a driveshaft that was maintained and not damaged due to outside forces (rocks, hitting it on things) actually fail. i have seen numerous DC joints break, u joints fail, and tubing twist due to misuse or just general off road abuse.
i run JE REEL shafts and have never had an issue. never heard of denny's though.
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