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18 speed mack range change noise


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Hi, I have a 90 model valueliner with a 18 speed Mack box, I think it's a T2018. When I go from low range to high it makes a big clonk noise.

The box is only 3 years old with only a cupple of thousands Ks on it.

Is there an adjustment or something to stop this.

All help is a appreciated.

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  • 1 month later...

Could be a loose synchro fork pinch bolt and or a synchro failure. Mack has the tools to do a "inframe" synchronizer replacement. Every truck is different, it depends on how much room you have to work with.

You can do an inframe synchro on a Granite in 6-8 hours.

I did an inframe on a RD one time. The rear of the cab had to be unbolted and lifted up, it was a total waste of time. Pulling the trans would've been easier.

The trans is a T2180

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