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When on the gas I get a driveline vibration from 55 to 60 miles per hour. This only occurs with 400 lbs or more in the box. When empty the truck drives smooth. Is much more noticeable uphill.


So far the dealer has swapped tires, inspected rear diff, swapped driveshaft (2 piece), tested engine balance of injectors, and finally put in a new transmission. All with no effect. To be fair to the dealer we didn't realize at first that it was affected by the load. They probably would have approached the troubleshooting differently.


Any suggestions would be appreciated. I have a CC,D/A,LB. The truck is stock except for 265 tires.
 

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I have also experienced the same vibration when hauling a heavy load. Empty the truck pulls smooth through that speed range. I am keen to see if anyone has the fix for this abnormality.
 
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