Medium and Heavy Trucks
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Hi my name is***** will be glad to try to help. First I recommend changing the oil with the correct synthetic oil and checking for signs of metal and burnt discoloration indicating an internal failure occuring. If the oil is clean see if the noise resolves after the service. Is there a vibration along with this noise? If so under what conditions? Are you getting any fault codes from the transmission? What is the complete model info from the transmission tag?