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Mack 310m

Ray Hines

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My 2006 Mack 310m transmisson makes a noise when shifting from 4th to 5th (range selector moved from low to high) It does not make the noise all the time only occasionally, seems to make it more when the tranmission is cooler.

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Things to check! If The truck is equipped with a trans cooler and you*ve been loosing coolant check the trans for being over full (antifreeze in the oil will ruin syncros)

Also check the yoke bolt be sure its tight also will take out the syncro!

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