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Drive shafts can and will fail and certain times, ujoints use needle bearings, over time like any bearing it will fail and when they do its not very fun. We typically will build a drive shaft loop for any car that is going to be pushing a good amount of power because it is common. You may of just been unfortunate and the u joint locked up on you and stopped allowing motion which snapped the shaft. You are lucky that the rear shaft didnt dig that hard into the ground while you were still moving. Stick a steel one piece in there with good joints and have better piece of mind
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