Post by: HntnFsh on September 24, 2025, 08:23:31 PM
Sounds like 9 or 10 mpg towing about 8-10 thousand pounds and 14-15 mpg general driving. Sound realistic? Other than possible oil consumption they seem solid. Saw a dandy from out of stat, but was a Canada truck. I guess its probably not a big deal. But it makes me nervous.
Post by: Dan-o on September 24, 2025, 08:37:29 PM
MY brother has had both trucks you describe. He really likes the 10-speed, for what it's worth.
Post by: fishngamereaper on September 24, 2025, 08:53:02 PM
Ive had a dirty max in the past and honestly the new 6.6 gas is just as good.
I have the first gen...its a 6spd. Drove a 10 spd and they are nice. But my 6spd is just fine. My boat is 6k and I've towed equipment up to 15k. Average 10-12 mpg.
Daily driving I'm getting 15. Hwy driving I just got 17 today from Idaho to the WA coast.
And I don't burn any oil... I've heard some stories but it's a non issue for me.
Post by: Bigtine96 on September 24, 2025, 09:34:22 PM
Post by: NOCK NOCK on September 25, 2025, 06:23:00 AM
I'll let ya know what I think after driving it back from OR. .....Pretty sure all aspects will be nicer than the 07,,,,but it was a Great Truck for me.
Post by: trophyhunt on September 25, 2025, 06:51:47 AM
Post by: 300rum on September 25, 2025, 09:09:55 AM
Post by: Happy Gilmore on September 25, 2025, 09:11:56 PM
Here's the GM list; all diesel. All bought new except 2003. It had 70k
2002 2500 still have it 340k never had anything replaced
2003 2500 sold at 240 with fuel delivery issues starting
2020 3500 sold at 100k. Friends now have it. Never an issue has 175k now
2024 3500. Have it now, no issues. 55k
2015 3500 less than 3k miles in last 2 years. Everything wrong cant keep it running. Everything front to back replaced stays in limp mode, back to shop tomorrow on a trailer
2024 2500 (because above truck is a pos) has 50k no issues. Being traded in with above lemon at Dave smith for ordered 3500.
2025 3500 and hopefully last truck for a while. Its on a train right now. Will be wife's truck. I take her 2024 as the farm truck/reliable tow rig.
The 10 speeds are sweet and the new platform and package is amazing. The 2015 has been an absolute nightmare.
Post by: HntnFsh on September 26, 2025, 05:57:50 AM
Post by: Woodchuck on September 26, 2025, 08:33:03 AM
Post by: EnglishSetter on September 26, 2025, 12:23:12 PM
Found this video specific to the diesel, but should translate to gas.
Post by: spin05 on September 29, 2025, 02:20:47 AM
10 speed is amazing. Dont ask me to explain why but, we put a lot of miles on trucks and have been through a few dialing it in.
Here's the GM list; all diesel. All bought new except 2003. It had 70k
2002 2500 still have it 340k never had anything replaced
2003 2500 sold at 240 with fuel delivery issues starting
2020 3500 sold at 100k. Friends now have it. Never an issue has 175k now
2024 3500. Have it now, no issues. 55k
2015 3500 less than 3k miles in last 2 years. Everything wrong cant keep it running. Everything front to back replaced stays in limp mode, back to shop tomorrow on a trailer
2024 2500 (because above truck is a pos) has 50k no issues. Being traded in with above lemon at Dave smith for ordered 3500.
2025 3500 and hopefully last truck for a while. Its on a train right now. Will be wife's truck. I take her 2024 as the farm truck/reliable tow rig.
The 10 speeds are sweet and the new platform and package is amazing. The 2015 has been an absolute nightmare.
I got a 2025 3500 GMC AT4 in may. Its been great. Lot to learn of this new fancy stuff coming off a 04 3500 Ram. But yea the 10 spd is so far awsome. in tow haul with the camper i barely have to ever touch the brakes.
Post by: trophyhunt on September 29, 2025, 05:50:51 AM
Post by: Tim in Wa. on September 29, 2025, 05:58:42 AM
Post by: Bigtine96 on September 29, 2025, 07:10:45 AM
Has anyone else heard about the problem with the 10 speed? GMC supposedly has a fix but they fix it after it breaks.
Yes the 10 speeds have been known to have valve body issues, mine started shifted a little strange one day was told there was a update to the tranny software but when I went into Chevy they said all was well and nothing they can do. So yeah it will be a once it fails type of situation. Typical
And no not just the 1500’s have issues.
Post by: HntnFsh on September 29, 2025, 08:20:24 AM
Post by: trophyhunt on September 29, 2025, 09:04:20 AM
Do you also have low miles?Has anyone else heard about the problem with the 10 speed? GMC supposedly has a fix but they fix it after it breaks.
Yes the 10 speeds have been known to have valve body issues, mine started shifted a little strange one day was told there was a update to the tranny software but when I went into Chevy they said all was well and nothing they can do. So yeah it will be a once it fails type of situation. Typical
And no not just the 1500’s have issues.
Post by: Bigtine96 on September 29, 2025, 09:11:58 AM
Do you also have low miles?Has anyone else heard about the problem with the 10 speed? GMC supposedly has a fix but they fix it after it breaks.
Yes the 10 speeds have been known to have valve body issues, mine started shifted a little strange one day was told there was a update to the tranny software but when I went into Chevy they said all was well and nothing they can do. So yeah it will be a once it fails type of situation. Typical
And no not just the 1500’s have issues.
26,000 miles as of this morning.
Post by: trophyhunt on September 29, 2025, 10:15:54 AM
That sucks!!!!Do you also have low miles?Has anyone else heard about the problem with the 10 speed? GMC supposedly has a fix but they fix it after it breaks.
Yes the 10 speeds have been known to have valve body issues, mine started shifted a little strange one day was told there was a update to the tranny software but when I went into Chevy they said all was well and nothing they can do. So yeah it will be a once it fails type of situation. Typical
And no not just the 1500’s have issues.
26,000 miles as of this morning.
Post by: spin05 on September 29, 2025, 11:36:29 PM
Has anyone else heard about the problem with the 10 speed? GMC supposedly has a fix but they fix it after it breaks.
Yes i am aware of it. Like others have said its a valve body issue. I will be changing fluid often, Suppose to be fixed in the 2025 model but will see. The fix it to install this or his entire valve body. https://nextgendiesel.com/products/project-carbon%C2%AE-10l80-e-diy-valve-body-upgrade-kit-v3-1?srsltid=AfmBOoqWuGQu82rIqOOIUJFi08VwXktIBxnvT6gH06u1RgLP86_T5CMe&variant=44893280075949 Which of course voids your warranty
Post by: Happy Gilmore on October 02, 2025, 01:29:42 PM
Only had an issue with the 5 speed. Bought the truck chipped and modified. It was terrible. Dont do that to a truck unless you plan on selling it and not putting a lot of miles on it or you dont tow much and just drive to the mall.
Post by: NOCK NOCK on October 03, 2025, 04:54:59 AM
What is the use for 10 speeds/gears in a truck?
With that being said, I do love the truck, lots of power and drives like a caddy, although it is quite larger than my 07 in height & width. What's crazy is that it has the 6-10 (medium) bed......yet truck is the same length as my 07 crew long box.
Post by: Boss .300 winmag on October 03, 2025, 08:28:14 AM
Im gonna fess up......what is the purpose of a 10 speed tranny? I'm a pretty basic guy, 2wd-4Hi-4L, gets me anywhere pulling anything. :dunno:
What is the use for 10 speeds/gears in a truck?
With that being said, I do love the truck, lots of power and drives like a caddy, although it is quite larger than my 07 in height & width. What's crazy is that it has the 6-10 (medium) bed......yet truck is the same length as my 07 crew long box.
The standard max width is 8.5’, how wide was the 07?
Post by: NOCK NOCK on October 03, 2025, 04:49:56 PM