First pull with the 6.7 and 6 speed and 342 gear .. just as a comparison from our 2007 5.9- 373 gear and Built 48 trans i really am not that impressed with the 6.7 . must be the 342 gear . with Tow haul button on it shifts good and different rpms but it will kick out of 6th at a grade ? The 5.9 with the 4 speed was solid 1700 rpm @ 65 towing and with many cost to coast 7.800 miles trips it was very rare to kick down a gear up any grade and if it did it usually startled me be cause i never realized i was going up a grade ? Oh Now same trailer im @ 10.5 MPG and the 5.9 was 15 mpg towing . I may re-gear this just so a damn 5.9 does not pass me up a grade LOL , This is our travel trailer 5k lbs downsized from a Tri axle 8k Rapter TH think we are around 10.000 under towing weight.
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