loveracing1988
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No, tow haul just changes the shift points. In some vehicles yes it does lock out the top gear. My 2014 with the 6.4 did it.I see what y'all are saying, seems like 35s are the max without a regear for heavy towing. @loveracing1988 - maybe this is my ignorance showing, but wouldn't tow/haul mode lock out 6th anyways?