The 6 speed 68RFE transmission is available on 2007.5 to current year trucks. So I doubt there is anything unless it's after market. I have the Aisin AS69RC transmission and I have to say I really like it. It adapts to your driving style and shifts very smooth.
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2018 Ram 3500 Laramie Longhorn 4X4 Dually Cummins Aisin CC LB / B&W Companion hitch
50 Gallon Transfer Flow in bed tank w/ Trax 3
2018 Montana 3121RL
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