Aluminum Driveshaft Max RPM
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Aluminum Driveshaft Max RPM
What is the max rpm on the aluminum driveshafts? I saw a post that said something along the lines of "most dyno shops wont dyno something w/ an aluminum driveshaft in 3rd bc it will blow up at 130". well, the speed will change dependent on gears and tire sizes so am i at risk? 35's w/ 4.56's. Cruise at 80 a lot... sometimes hit 100ish just messing around on the highway going out of town.
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There is no speed at witch it will blow up. There are a TON of variables that go into DS problems. Just search and you will find all you need to know and some fun vids of shafts blowing up on dynos
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It's 95% dependant on the driveshaft length. All the guys that have had it last past 130+ don't have the 72" long driveshaft, which is what most blown ones here have been. The long ones have a low resonance frequency, so they bust much earlier than the shorter ones. Technically, a perfectly balanced 72" should go to 6100, but the factory isn't going to spend the extra money to do that for the 1% of us that override the speed limiter and go faster than that (https://www.performancetrucks.net/fo...d.php?t=364990).
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I had a 83 inch drive shaft and had it up to 150 +/-. I would not recommend that ever because the rear end starts to shift and I ended up knocking the drive shaft on a crossmember. Fortunetly I did not break it but I'm sure if I were to even get close to that speed again I would grenade the thing. Mine started to vibrate at about 115.