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dawson1953

Question about rotation noise in truck

Question

I have a 2021 international 4300 series, has little over 5000 miles. Since day one this truck has had a annoying rotation sound in sixth gear. If you are driving down road and let off fuel it goes away, or if shifted in 5th gear it goes away. It does it between 60 and 70 miles an hour the most. Dealership told me it was front tires, have put new set on and no differnce. Took to another dealership, they can hear noise but dont know what it is, and dont think it will cause any major problems. Problem is , it is very annoying. Anyone have any ideas what this could be. 

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Posted (edited)

Would recommend finding a dealer with an ‘A’ technician who actually knows how to  perform a vibration analysis. Problem is, most dealer techs rely mostly on manufacturer tech lines to diagnose, and lack in actual diagnostic skills. Without experiencing first hand, it sounds like a second order vibration. 

Is truck auto or manual?  When noise occurs shift trans into neautral while maintaining speed, is there any change ?

 

Edited by Njsss

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Check the fluids if you haven't- we  have seen brand new trucks with no fluid in rear differential in the past. Also Allison transmissions are very finicky about being just a 1/2 pint low.


Mark

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I would request that a district division representative become involved. That trans really should be replaced if triple checking the fluid levels does not rectify the issue. There are many things that can go wrong when a person who is less than competent takes apart a transmission. And you purchased a new unit. You should get a new transmission that has not been finger f'ed by a technician. They have already demonstrated an inability and or unwillingness to fix the issue. Time to get a factory representative involved. You should request an extension of the factory warranty if they do not exchange it for a new trans. You bought a new truck to work it, not for it to sit in a service bay as a dead turtle.

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