Medium and Heavy Trucks
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Hi my name is***** will be glad to try to help. What is the make and the model of the machine from the ID tag?
Start by checking the transmission oil filter and suction screen for metal/debris that would flag an internal failure or problem occurring which would require disassembly and rebuild of the transmission. If clean the next step is to have the transmission pressures tested with gauges to see if there is a pump, converter, clutch or valve issue inside the transmission depending on the model you have. Let me know
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