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Old 03-24-2019, 12:32 PM   #21
Junior Member
Join Date: Jun 2016
Location: Park City, UT
Posts: 11
Towing mountain grades

I had a 2013 2500HD with the 6.0 liter with the dual fuel CNG option. It pulled my Montana HC 325Rl ( about 8900# dry) just fine( not using CNG to tow). I live here in Utah and can't drive anywhere north, south, east, or west without pulling a steep grade at some point. Did it with that Montana with no problems. I didn't have the 4:10's so you'll pull the grades just fine going up. If your trailer brakes are adequate and adjusted, I never had a problem going down either. Tow/Haul mode with the grade braking is definitely helpful. I went to a 1-ton Duramax in 2016 when we switched to a bigger 5er. The recommendation to have fresh fluids and synthetic is a good one. I'd do the trans, xfer case, front/rear diff's as well. If you have time, take scenic byway 12 from Torrey down through the Grand Staircase. Highway 191 from I-70 down through Arches, Canyonlands, to Mexican Hat has great scenery. It's really crowded here anymore in the summer so be patient in the Nat Parks. Enjoy the trip.

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Old 03-24-2019, 01:34 PM   #22
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Join Date: Aug 2018
Location: prophetstown
Posts: 318
Originally Posted by Wilco View Post
I have the same truck and similar size trailer. We spent 2018 winter in the area you are going to visit. I used tow/haul mode and would switch the transmission to manual and manually downshift on the downhill sections to preserve the brakes.

I-70 thru Colorado is your easiest route. Alternately swing south through southern Colorado and visit Mesa Verde NP on your way to Utah.

PM me if you have any questions.
I also switch to manual shifting on downhill runs,,, worked better for me

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