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6 Speed Transmission Noise 6th Gear Kick Down To 5th


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I just recently noticed a grinding / slipping noise when the trans down shifts from 6th gear to 5th only when under a load going up hill?? It almost sounds like a hydraulic pump squelling from running low on fluid. The trans is full. My truck is a 2007 1/2 2500HD. I love my truck, but what's up with the trans shifting into 6th @ 40-45 MPH? Does anyone else find this a bit annoying? What can be done? :flag:

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