GearHead71

This bothers me too. I think it adjusts just as "high" as the passenger mirror, the problem is we sit so much closer to it. I wish I could raise it up higher as well.

I know!! I just need to talk myself into that. I freaking LOVE the truck other than this one thing. I need to get over it. I'm just all up in arms right now. I'm sure it will fade.

I hear you. I don't drive it often, but most of the camping we do are up in the mountains. I didn't want to deal with a diesel. From what I read if you can answer "yes" to at least 2 of these 3 conditions you should get a diesel: 1. Tow heavy 2. Tow all the time 3. Tow at altitude Really, I can only answer yes to the 3rd. I guess the only reason I'm disappointed is that I feel like the Ford F250 and RAM 2500 gassers could do it. I researched the heck out of these trucks before buying but didn't look at this at all. I figured the powertrain engineers had done their homework. And really the biggest concern for me is I bought this truck to be able to get a larger camper. Given the struggle with my 5500lb camper I'm not sure I want to go up to a 9500lb one. I know it will do great everywhere but this one use-case but still.

That's a good thought, I didn't know that could be an issue. Unfortunately I don't have adjustable pedals. But I'd be interested to hear if that helps anyone else.

That's the same stretch that I ran into problems. Speed limit is 60MPH which I couldn't maintain. Like you, I held about 50 MPH. What's frustrating is my 2017 RAM 1500 was able to maintain 60 (granted, I was flooring it the whole time.)

And..... Just because the spreadsheet is set up and easy to use now, here's what it would look like if GMC offered the 10 speed in the 6.6 gas. I don't know why I'm doing this, I'm just getting more disappointed ? GMC 2500 6.6L Gas (redline: 5600 RPM) Diff Gears 3.73 55 MPH 60 MPH 65 MPH Gear Gear Ratio Final Drive Engine RPM Engine RPM Engine RPM 1st 4.54 16.9342 9907.71 10808.41 11709.11 2nd 2.86 10.6678 6241.421 6808.822 7376.224 3rd 2.06 7.6838 4495.569 4904.257 5312.945 4th 1.72 6.4156 3753.582 4094.816 4436.051 5th 1.48 5.5204 3229.826 3523.447 3817.067 6th 1.26 4.6998 2749.717 2999.691 3249.665 7th 1 3.73 2182.315 2380.707 2579.099 8th 0.85 3.1705 1854.968 2023.601 2192.235 9th 0.68 2.5364 1483.974 1618.881 1753.788 10th 0.63 2.3499 1374.858 1499.846 1624.833 Problem solved, this would proved TWO additional gears at 60mph. I'm stuck at 3600 in 3rd. With the 10 speed, 5th would be 3500, 4th would be 4100 and 3rd would be 4900.

I did the same exercise for the Ford 7.3 (w/ 3.55 and 4.30) as well as the RAM with the 6.4 (3.73 and 4.10). I know I'm only looking at one specific speed range (55-65MPH) but that's where mine is struggling. What you can see from the data below is at 60MPH both the RAM and Ford (in BOTH axle gear options) have a gear (or TWO) in the 4000-5000 RPM range whereas the GMC does not. (I had a hard time finding redline for the RAM 6.4L hemi with the 8HP75 trans as well as the for Ford 7.3 with the 10R140, but this will get us close enough). RAM 2500 6.4L Hemi (redline: 5800 RPM) Diff Gears 3.73 55 MPH 60 MPH 65 MPH Gear Gear Ratio Final Drive Engine RPM Engine RPM Engine RPM 1st 4.71 17.5683 9782.917 10672.27 11561.63 2nd 3.14 11.7122 6521.945 7114.849 7707.753 3rd 2.1 7.833 4361.81 4758.339 5154.867 4th 1.66 6.1918 3447.907 3761.353 4074.799 5th 1.28 4.7744 2658.627 2900.321 3142.014 6th 1 3.73 2077.053 2265.876 2454.698 7th 0.83 3.0959 1723.954 1880.677 2037.4 8th 0.66 2.4618 1370.855 1495.478 1620.101 RAM 2500 6.4L Hemi (redline: 5800 RPM) Diff Gears 4.1 55 MPH 60 MPH 65 MPH Gear Gear Ratio Final Drive Engine RPM Engine RPM Engine RPM 1st 4.71 19.311 10753.34 11730.92 12708.49 2nd 3.14 12.874 7168.894 7820.612 8472.329 3rd 2.1 8.61 4794.483 5230.345 5666.207 4th 1.66 6.806 3789.925 4134.463 4479.002 5th 1.28 5.248 2922.352 3188.02 3453.688 6th 1 4.1 2283.087 2490.641 2698.194 7th 0.83 3.403 1894.962 2067.232 2239.501 8th 0.66 2.706 1506.838 1643.823 1780.808 Ford F250 7.3L Gas (redline: 5500 RPM) Diff Gears 3.55 55 MPH 60 MPH 65 MPH Gear Gear Ratio Final Drive Engine RPM Engine RPM Engine RPM 1st 4.615 16.38325 9123.022 9952.387 10781.75 2nd 2.929 10.39795 5790.104 6316.477 6842.85 3rd 2.132 7.5686 4214.579 4597.723 4980.866 4th 1.773 6.29415 3504.901 3823.528 4142.156 5th 1.519 5.39245 3002.789 3275.77 3548.75 6th 1.277 4.53335 2524.398 2753.889 2983.38 7th 1 3.55 1976.819 2156.53 2336.241 8th 0.85 3.0175 1680.297 1833.051 1985.805 9th 0.687 2.43885 1358.075 1481.536 1604.998 10th 0.632 2.2436 1249.35 1362.927 1476.504 Ford F250 7.3L Gas (redline: 5500 RPM) Diff Gears 4.3 55 MPH 60 MPH 65 MPH Gear Gear Ratio Final Drive Engine RPM Engine RPM Engine RPM 1st 4.615 19.8445 11050.42 12055 13059.59 2nd 2.929 12.5947 7013.366 7650.944 8288.523 3rd 2.132 9.1676 5104.983 5569.072 6033.162 4th 1.773 7.6239 4245.373 4631.316 5017.259 5th 1.519 6.5317 3637.181 3967.834 4298.486 6th 1.277 5.4911 3057.722 3335.697 3613.672 7th 1 4.3 2394.457 2612.135 2829.813 8th 0.85 3.655 2035.289 2220.315 2405.341 9th 0.687 2.9541 1644.992 1794.537 1944.082 10th 0.632 2.7176 1513.297 1650.87 1788.442 GMC 2500 6.6L Gas (redline: 5600 RPM) Diff Gears 3.73 55 MPH 60 MPH 65 MPH Gear Gear Ratio Final Drive Engine RPM Engine RPM Engine RPM 1st 4.03 15.0319 8794.729042 9594.25 10393.77 2nd 2.36 8.8028 5150.263161 5618.469 6086.675 3rd 1.53 5.7069 3338.941795 3642.482 3946.022 4th 1.15 4.2895 2509.662134 2737.813 2965.964 5th 0.85 3.1705 1854.967664 2023.601 2192.235 6th 0.67 2.4991 1462.150982 1595.074 1727.997 I did look at what would happen if I re-geared to 4.56 (4.10 wouldn't be a big enough change) and that would get me from being stuck at 3600 RPM at 60 MPH with no power to 4450 RPM which is closer to the max torque. I feel like that would solve my problem but my gas mileage would take a hit (this is also my daily driver) and I need to look and make sure I'm not just moving this problem to a different gear/speed range. GMC 2500 6.6L Gas (redline: 5600 RPM) Diff Gears 4.56 55 MPH 60 MPH 65 MPH Gear Gear Ratio Final Drive Engine RPM Engine RPM Engine RPM 1st 4.03 18.3768 10751.73309 11729.16 12706.59 2nd 2.36 10.7616 6296.300272 6868.691 7441.082 3rd 1.53 6.9768 4081.923481 4453.007 4824.091 4th 1.15 5.244 3068.112421 3347.032 3625.951 5th 0.85 3.876 2267.735267 2473.893 2680.051 6th 0.67 3.0552 1787.508976 1950.01 2112.511

I really hope something is amiss. I love this truck otherwise but this is really making me regret my decision. I'm not a Ford guy but looking at the 7.3 gas with the 10 speed is making me wonder. I really think if my truck had the 10 speed I wouldn't be having this problem. It just needs a gear between second and third to bring the engine RPMs back near the power band at 60 miles an hour

Mine is 4WD. We tow in the mountains about 6 times a year. The only thing that makes me nervous is I'm only towing 5500lbs. I bought this truck so we could get a bigger camper (around 9500lbs). Given how it struggles now in the mountains, I'm not sure how much worse it will do with the larger camper. I'm going to call around and see how much a re-gear is. Also, not sure the jump to 4.10 would be enough of a difference. Might need to go up to 4.56 and at that point you need a new carrier as well...

I'm with you! And I LOVE the truck and the towing other than this one issue. Unfortunately for me, the times it struggles and can't maintain the speed limit kill the rest of the experience. Maybe a re-gear will help me, or maybe I just need to get over this one instance of under-performance (that would be cheaper haha)

So just to have some hard numbers to look at I looked up the gearing for the 6 Speed: Gear Gear Ratio 1st 4.03 2nd 2.36 3rd 1.53 4th 1.15 5th 8.5 6th 0.67 Other stats: Front and Rear Gear Ratio: 3.73:1 Engine Redline: 5600RPM Max Torque: 464 @ 4000RPM Max HP: 401 @ 5200PRM Tire Size: 265/70R17 (without actually measuring my tires, that's about a 99.3 inch circumference) Given this, here are the engine RPMs at 3 different MPH (RPMs in bold are above redline): 55MPH: Gear Engine RPM 1st 8794.345637 2nd 5150.038636 3rd 3338.796234 4th 2509.552725 5th 1854.886797 6th 1462.08724 60MPH: Gear Engine RPM 1st 9593.831604 2nd 5618.223966 3rd 3642.323165 4th 2737.693882 5th 2023.512869 6th 1595.004262 65MPH: Gear Engine RPM 1st 10393.31757 2nd 6086.409297 3rd 3945.850095 4th 2965.835039 5th 2192.138942 6th 1727.921283 As you can see (take the trailer out of the equation), at 60MPH the LOWEST gear I can use is 3rd and the RPMs are only at 3642. That's a little below where the max torque is, and well below max hp. I'm going to play around with what re-gearing will look like (either 4.10 or 4.56). Take even 55MPH. Your options are either almost 5200 RPM (screaming) or 3340 (no power). This is exactly what I've been experiencing. To me, it still seems like it's missing a gear between 2nd and 3rd. Either that, or maybe they should have "shortened" the gap between 2nd and 3rd. At 60 MPH it's a 2,000 RPM jump between 2nd and 3rd (even though you can't use 2nd gear) but only a 900 RPM jump between 3rd and 4th; 715RPM between 4th and 5th. I know those shouldn't be linear, but still seems like a big gap.

Heading eastbound up to Eisenhower is definitely one spot I can't maintain 55mph. Maybe I just need to learn patience and take it at 45. Haha. But that was the spot where it was embarrassing. My father in law passed me in his 2014 Tundra and my buddy passed me in his 2019 Ram 1500 (we all have similar weight trailers). I was the only one that couldn't maintain the speed limit in my brand new "big" truck.

I guess a better way to say it is while towing if I lock it into 2nd gear before the hill my speed will be limited to about 59mph and that will be around 5500rpm. The only way to get to 60mph is for it to shift to 3rd gear which drops the rpms to about 3500rpm and I loose all power. I haven't been able to maintain 60mpm up a steep (long distant) incline. Is there something else I should try?

I usually use mid grade which around here is typically 87 I need to look up the torque and horsepower curves. I'm thinking about regearing, need to figure out if that will help my problem I haven't looked up where the truck makes its max torque and horsepower. If it's around 3500 RPM you are correct. But to me it feels more like around 4200-4500 RPM. That's why I feel like it's a transmission/gearing issue. There's no gear to keep me around 4500 RPM at 60mph. I was surprised there was no gearing option lower than 3.73 for the gas. I'm considering going to 4.10 or 4.30 but need to do some more research. And figure out if anyone is regearing these trucks.

We drove up and back from Breckenridge this weekend. Same story. Any long uphill grades the truck could BARELY maintain the speed limit and in a couple instances couldn't maintain speed. I tried the following with no improvements: Turning on cruise control Turning off tow/haul mode Putting it into "L" and manually downshifting What's really weird about the last one is even when I tried to force it to downshift it wouldn't..... What's even stranger is it would be at 3500RPM at 55 MPH and when I'd try and manually downshift the RPMs would increase to about 3700 RPM but it wouldn't change gears.... I don't understand how that happens. I am going to call the dealer today and see what they can do, it feels like it's almost in a limp mode or something. I was getting passed by half tons pulling bigger campers than mine.