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That is called TORQUE CONVERTER SHUDDER, More then likely the converter is heating up and getting to hot.

Is the truck under warrenty ?? I would push the dealer real hard if it is.

Sounds like they don't want to warrenty it.

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Q: 2004 Chevy 34 ton truck with an Allison transmission that has a shudder when shifting from 1st to 2nd and from 2nd to 3rd The dealerships have not been able to find out what is causing this?
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