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There is not a lot of information to go by in your question.

There are many reasons why an engine might lock up -

- Ran with no oil

- Ran over heating

- Timing chain broke / piston damage

- Piston damage in general

And more.

Have the truck towed to a qualified mechanic and have him tell you what's wrong.

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Wiki User

15y ago

What else can I help you with?