Not overly impressed.
Senior User
Joined: Apr 2017
Posts: 136
Likes: 2
From: Bay Area California
Ok this may sound silly, but are Your gas pedal adjusted properly. Like I said it sounds silly, but if Your not pushing the gas pedal all the way down, your going to notice a performance drop. I speak from experience. lol
Senior User
Joined: Mar 2017
Posts: 173
Likes: 2
From: Pratt, KS
Might try adjusting the pedals closer to you. It might be a long shot, but I found it to be the problem on my ‘16 Denali HD. I’m 6’3 and had moved the pedals further out to give me more leg room. One day someone else had adjusted them closer to the seat and it was like driving an entirely different pickup when I got back in. I haven’t had this problem with my F250, but might be something to try.
Tuned
Joined: Feb 2017
Posts: 394
Likes: 75
From: Alaska
Doing a quick calculation, your 4th gear with 34" tires and a 3.55 is nearly identical to my F450's 5th gear with my 4.30 and 31.5" tires. I pull at around 2570 RPMs at 65 in 5th, so you should be around 2630 at 65 in fourth. You should have no issue pulling 6% grade at 65 in 4th gear, 2630 is a fine speed for the 6.7.
Senior User
Joined: May 2017
Posts: 234
Likes: 2
I’ve pulled that same exact mountain pass with my 13,000 pound fifth wheel in tow and cruised right up it at 60mph, no problem. No weird downshifting either. I was super impressed, comparing to the performance of my former Ram 3500 diesel. My truck is the diesel with the 3.55s.
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Laughing Gas
Joined: Oct 2017
Posts: 787
Likes: 72
From: Lansing MI
Another thing to keep in mind as this is a SRW truck we are talking about, is once it drops to 3rd, getting back to 4th on the grade may not be possible due to the torque management, for 1st - 3rd on the SRW trucks. If you did not have enough torque to hold 4th, and the computer drops to 3rd, but the engine management system does not allow you as much torque in 3rd as you had if 4th to begin with.
Super Moderator
Joined: Aug 2008
Posts: 37,376
Likes: 1,861
From: Frederick, MD
Lets all play nice, I do think there is more to the story here, but not the op, rather how the truck responds vs the GMC.
There maybe a issue with the go pedal and its location or just gearing.
There maybe a issue with the go pedal and its location or just gearing.
Thread Starter
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Cross-Country
Joined: May 2018
Posts: 53
Likes: 4
Will find out Monday. Pulling it back the same road. I plan to lock out 6th gear up all these hills and start up the hill with good momentum so it doesn’t try to gear down to third. It just may be a different way of gearing the truck vs the GMC which had 3.73. Also hoping the wind won’t be blowing like the other day.
Tuned
Joined: Jun 2006
Posts: 453
Likes: 1
From: Montana
We have a 2014 CCSB F350 6.7 with 3.55 gears and have not been overly impressed with the mountain towing. When we bought it new we had a 8k (empty) travel trailer and pulling in the mountains of Colorado Wyoming and Montana was great. This year we upgraded to a 12k (empty) fifth wheel toy hauler and it seems to hunt gears even on small hills. We are looking at ordering a 2019 with 4.30 gears since it is not a daily driver and is mostly used to tow. I love this motor but hind sight being what it is I wish I would have done more homework on gear ratios. We are not just upgrading because of the gearing we also want to get a long bed and the upgraded technology so it's paid off when we are ready to retire. Live and learn I guess, good luck with yours.
Freshman User
Joined: Jun 2018
Posts: 45
Likes: 0
We have a 2014 CCSB F350 6.7 with 3.55 gears and have not been overly impressed with the mountain towing. When we bought it new we had a 8k (empty) travel trailer and pulling in the mountains of Colorado Wyoming and Montana was great. This year we upgraded to a 12k (empty) fifth wheel toy hauler and it seems to hunt gears even on small hills. We are looking at ordering a 2019 with 4.30 gears since it is not a daily driver and is mostly used to tow. I love this motor but hind sight being what it is I wish I would have done more homework on gear ratios. We are not just upgrading because of the gearing we also want to get a long bed and the upgraded technology so it's paid off when we are ready to retire. Live and learn I guess, good luck with yours.