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How Does a 2015 GMC Denali End Up With a Twisted Aluminum Driveshaft?

Driveshafts are generally pretty dang durable, even more modern versions that are ...

Driveshafts are generally pretty dang durable, even more modern versions that are made from lightweight aluminum instead of heavier traditional steel. However, there are always going to be those times when things don’t quite go according to “generally”, as we see with this 2015 GMC Yukon Denali.

Towed in to the lot with a note on the window about what is wrong, the technician crawls underneath the new GMC family hauler, we are treated to some gnarly carnage, as the driveshaft itself has twisted itself in half just behind the front universal joint.

Though there can be a number of causes of this type of failure, the mechanic determined that this shaft was weakened by the weld used to attach the balance weight to the outside of the aluminum tube, allowing it to fail at a much lower stress level than it would normally. This is what created the pretty cool looking piece of scrap. Hopefully the replacement holds up better for the vehicle’s owner!





 

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