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Old 06-27-2018, 06:57 PM   #1
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Sheared Driveshaft

Hey all, I have a 3rd Gen 1500 hemi mildly supercharged pushing ~500hp. Have probably 20 passes down the strip with it. Just had my stock rear driveshaft shear in half right down the middle @ 90 mph (4000 ish shaft rpm). What a mess, just crossing my fingers my tranny made it out okay. Trying to figure out what went wrong as it seems like a rare failure after talking around. Little nervous to take it out again, albeit next time will be with a built driveshaft. Since it didn’t fail in a dig from a dead stop I don’t think it was over torqued. I recently lowered the truck, which messed up my driveshaft angles. The best setup I could settle on had the tranny lifted to 3 degree down and diff at 0.5 degree up. So they are slightly out of sync at rest but this was all I could achieve to get some sort of negative working angle on the rear pinion to account for axle wrap. The truck didn’t vibrate at speed, but perhaps this mismatch still caused my failure? Did I overspin the stock shaft? Or just too much power?? Doesn’t seem like upgraded driveshafts are a hot topic in the ram performance world so any insight would be appreciated.

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Old 06-27-2018, 07:12 PM   #2
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Single cab or quad first ?

My stock steel shaft is holding 600 rwhp and I am shocked to say the least running 126mph so far woth no failure yet. There are companies that make them but will likely need custom made shaft
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Old 06-27-2018, 07:28 PM   #3
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Quad cab, aluminum shaft. Sheared the rear steel yoke in half too after it broke lose and flopping around we figure
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Old 06-27-2018, 07:43 PM   #4
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Yep those are known for failing a lot. You were making a good amount of power for sure then to break it
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Old 06-27-2018, 07:51 PM   #5
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Do the driveshaft angles seem alright, likely not the issue?
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Old 06-27-2018, 07:59 PM   #6
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That’s perfect because under load it’s likely dead on or very close
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Old 06-27-2018, 09:09 PM   #7
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What type of traction control are you using. The stock springs have a lot of wrap and can really mess up both the angles and spring load making it misaligned.
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Old 06-27-2018, 09:31 PM   #8
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Stock shaft, crushed the bearings (1310) in the cups. First high performance aluminum shaft 1350 joints, bulged the slip yoke which was an aluminum Sonnex. Second high performance aluminum shaft I'm using a 1350 steel viper slip yoke. I don't expect any issues with it using 60" truckarm suspension that does a great job of maintaing alignment.
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Old 06-28-2018, 02:45 AM   #9
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What gears are you running in the rear axle? Slicks or DR's?
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Old 06-28-2018, 08:22 AM   #10
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4.56 gears. Didn’t bring my DRs out this time, was running 295/45/20 toyos. That put my engine at 4000 rpm in 3rd when the driveshaft let go
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