06-27-2018, 07:57 PM
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Member
Join Date: Aug 2015
Location: Edmonton
Posts: 54
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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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