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2019 Chevy Trailboss - Crankshaft broke with 5,000 miles


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May 12, 2021
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I purchased a brand new Trailboss with the 5.3 V8 in June of 2019. In August of 2019, while hauling my 3000# pound boat on Interstate 65, the crankshaft in the engine broke. It had 5000 miles on it and I was well within towing/hauling limits. Has anyone else experienced this with their Trailboss or can I chalk it up to a bad part? I argued with Chevy and told them I wanted a new crate motor. They wouldn't do it and only agreed to repair the truck. They did increase the warranty to 100k miles on the powertrain. Has anyone else experienced this?
Modern GM V8's are generally regarded is near bullet-proof with 200k-300k mile motors still reliably chugging along. Crankshaft casting issue? That is a rare defect that does not make anyone's list of problems with GM V8s. 5000 miles is pretty new for a complete engine tear down. I hope they give you a loaner while you wait for this rebuild. They are adding 40k miles to warranty so that should help make you feel a little better protected.
I've been searching the Internet high and low to see if anyone else has experienced what I have. Haven't found a single instance of this happening to anyone else. It now has 24k miles on it. And, no, they did not provide me a loaner. Was without my truck for 2 weeks. They did pay for my rental car to get back home......after 3 months of nagging from me. It was a nightmare.
Shit you got it back in 2 weeks thats fast, shop must of been a low volume one. I have worked as a technician for a dealership for over 5 years and have never seen a crankshaft failure. You sure thats what they told you and not a Camshaft?

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