10L1000 anyone with High Mileage ? I hate Damocles....

[James Beyer]

2024 gmc 2500hd doublecab 6.6l gas, 81,000 miles, running great

[Chuck FB]

20 hours ago, James Beyer said:

2024 gmc 2500hd doublecab 6.6l gas, 81,000 miles, running great

 You've been going places with your truck by the looks of it and putting on the miles. I am curious as to what frequency you have generally been doing maintenance so far on the whole truck as per engine oil change intervals, diffs, transfer case and yes as per this thread have you dropped the oil in the pan of the transmission. If you have done any changing of oil on the transmission I am curious ( that's if you did it yourself as you may not know if a shop did it ) how the trans pan to exhaust clearance was handled as that is the major issue with the gas version vs the diesel that does not have anything in the way of dropping the pan. 

[James Beyer]

Hey Chuck,oil changed 5000-6000 miles, with fluids checked regular, trans changed once by dealer so not sure on clearance of pan to exhaust, but everything looked good.

Been running smooth so far. 

Put on 300 miles today, averaged 16.2 mpg going south, 15.7 mpg going north back to home, Later-

[Chuck FB]

18 minutes ago, James Beyer said:

Hey Chuck,oil changed 5000-6000 miles, with fluids checked regular, trans changed once by dealer so not sure on clearance of pan to exhaust, but everything looked good.

Been running smooth so far. 

Put on 300 miles today, averaged 16.2 mpg going south, 15.7 mpg going north back to home, Later-

 

Good to note you did have the trans serviced and given that a shop did the service, they have no reason to explain any details however perhaps the bill may be somewhat telling. I have not asked what a GM dealer here in Alberta would charge but a transmission shop quoted me 900.00 for labor/oil/filter and the reason for the seemingly high quote was labor due to them claiming they are removing the exhaust system ( the Y pipe assembly ) which would most definitely be very labor intensive. I just wonder if some shops do what they can to work around that design issue.  

[James Beyer]

1 minute ago, Chuck FB said:

 

Good to note you did have the trans serviced and given that a shop did the service, they have no reason to explain any details however perhaps the bill may be somewhat telling. I have not asked what a GM dealer here in Alberta would charge but a transmission shop quoted me 900.00 for labor/oil/filter and the reason for the seemingly high quote was labor due to them claiming they are removing the exhaust system ( the Y pipe assembly ) which would most definitely be very labor intensive. I just wonder if some shops do what they can to work around that design issue.  

Yes, alot of money, I am not sure on the Y pipe, it was not mentioned.  Heard of people complaining about the 10 speeds on the 2500hd 6.6l gas, but so far mine has been good. 

However, the 8 speed on my 2018 Chevrolet 1500 transmission went out at 94,000, and afm engine problems at 134,000, so I traded it for the 2500hd.

Overall, happy with the GMC 2500HD,

Later-

[Chuck FB]

1 minute ago, James Beyer said:

Yes, alot of money, I am not sure on the Y pipe, it was not mentioned.  Heard of people complaining about the 10 speeds on the 2500hd 6.6l gas, but so far mine has been good. 

However, the 8 speed on my 2018 Chevrolet 1500 transmission went out at 94,000, and afm engine problems at 134,000, so I traded it for the 2500hd.

Overall, happy with the GMC 2500HD,

Later-

 

I don't have the miles on mine to have wear problems yet or certainly shouldn't have !. That was part of the reason for buying an HD truck over a half ton ( aside from its ability to tow and/or haul heavier ) was to avoid the light duty engines with their stop/start and the DFM issues and the warranty push for 0w-20 oil as I am not on board with that, and in theory a stronger transmission. The penalty typically is a bit more expensive truck and certainly lower fuel economy and some parts and wear items tend to be more expensive for a heavy duty truck just to be using it for running around with mostly but probably better moose and deer protection with a taller truck. And I can fit under it to change the oil, the 1/2 ton is too low to fit under from what I can see without needing ramps. 

 

A friend with a chev half ton and it has the 6.2, so far it hasn't piled up but his trans suddenly acted up so bad he barely made it the few miles from his house to work and had them tow it to the dealer last summer. They replaced the valve body on it at only 20 thousand miles which is pretty pathetic but so far that seems to have fixed the issue but never gives one a fuzzy feeling when things fail like that. His engine, well they did the picoscope crank test last fall and it passed so its now running with 0W-40 oil. 

[James Beyer]

21 minutes ago, Chuck FB said:

 

I don't have the miles on mine to have wear problems yet or certainly shouldn't have !. That was part of the reason for buying an HD truck over a half ton ( aside from its ability to tow and/or haul heavier ) was to avoid the light duty engines with their stop/start and the DFM issues and the warranty push for 0w-20 oil as I am not on board with that, and in theory a stronger transmission. The penalty typically is a bit more expensive truck and certainly lower fuel economy and some parts and wear items tend to be more expensive for a heavy duty truck just to be using it for running around with mostly but probably better moose and deer protection with a taller truck. And I can fit under it to change the oil, the 1/2 ton is too low to fit under from what I can see without needing ramps. 

 

A friend with a chev half ton and it has the 6.2, so far it hasn't piled up but his trans suddenly acted up so bad he barely made it the few miles from his house to work and had them tow it to the dealer last summer. They replaced the valve body on it at only 20 thousand miles which is pretty pathetic but so far that seems to have fixed the issue but never gives one a fuzzy feeling when things fail like that. His engine, well they did the picoscope crank test last fall and it passed so its now running with 0W-40 oil. 

Really like the 1500 gas milage and ride. I'm not a fan of 0w oil, and always wondered how much the 0w had to do with bent lifters in the 1500 with dfm issues.  I think GM did very good with the 6.6l gas and 10 speed combo.

[Chuck FB]

19 minutes ago, James Beyer said:

Really like the 1500 gas milage and ride. I'm not a fan of 0w oil, and always wondered how much the 0w had to do with bent lifters in the 1500 with dfm issues.  I think GM did very good with the 6.6l gas and 10 speed combo.

 

Its tough these days to buy any brand of vehicle that has a great track record, of course they keep changing things so its always another surprise around the corner. Definitely a heavy tall truck is never going to get fantastic fuel economy although I do hear that the deleted 6.6 duramax can get pretty good economy ( yeah, after spending all that money on the truck and then the delete ! ). I've used a certain type of diesel/gas mixed fleet 0W-30 for years but that particular formulation no longer exists and these newer engines are not designed for it. The Dexos theme is another irritant of mine because they lowered the actual viscosity to near the bottom of the scale within the grades ( in terms of 30 grade but others as well ) vs lets say the Euro spec or non Dexos oils. Never the less the 5W-30 or right now am using a Dexos approved 0W-30 for the winter months is at least higher viscosity on the top end than the 0W20 which leaves little margin of protection. 

 

As I had commented elsewhere on this forum, if I do happen to get around to it next summer I will see if I can drop the trans oil in some fashion that I can avoid disturbing the exhaust any more than I have to, we will see if that is a failed experiment or not. 

 

Not that I had owned or test driven a current Ford or Ram so no seat of the pants comparison but so far like my truck in how the engine runs nice and smooth and so far the transmission has been very smooth and seamless. Because mine has the grill shutters I expect that helps it warm up faster as it seems pretty good in that way compared to other gas engines I've used and certainly better than the typical cold blooded nature of diesel engines. I just wish the darned block heater would function above 0F and was a larger wattage. 

[Byrds8]

13 hours ago, James Beyer said:

Yes, alot of money, I am not sure on the Y pipe, it was not mentioned.  Heard of people complaining about the 10 speeds on the 2500hd 6.6l gas, but so far mine has been good. 

However, the 8 speed on my 2018 Chevrolet 1500 transmission went out at 94,000, and afm engine problems at 134,000, so I traded it for the 2500hd.

Overall, happy with the GMC 2500HD,

Later-

Count my 10 speed in there for the 2500 HD Gas. Has a whine around 3rd/4th gears. They are thinking the planetary gears are not right. I have read a few post theirs has done this since new just like mine has. They are talking about getting an entirely new transmission. The truck has less than 4K miles on her.

Edited February 1 by Byrds8

[Chuck FB]

1 hour ago, Byrds8 said:

Count my 10 speed in there for the 2500 HD Gas. Has a whine around 3rd/4th gears. They are thinking the planetary gears are not right. I have read a few post theirs has done this since new just like mine has. They are talking about getting an entirely new transmission. The truck has less than 4K miles on her.

 

What year is your truck and also build month as sometimes a problem can be narrowed down to a certain build timeframe with a bad batch of manufactured components. I assume your is also the gas engine and still have not really heard anything as to how many parts are physically different in the gas version vs the diesel version, lots of guesses but no actual breakdown parts to show what is different ( lighter built, less clutches, different shaft materials etc ) 

[Byrds8]

2 hours ago, Chuck FB said:

 

What year is your truck and also build month as sometimes a problem can be narrowed down to a certain build timeframe with a bad batch of manufactured components. I assume your is also the gas engine and still have not really heard anything as to how many parts are physically different in the gas version vs the diesel version, lots of guesses but no actual breakdown parts to show what is different ( lighter built, less clutches, different shaft materials etc ) 

Mine is a 2026 and yes, it's gas. As for build date, I think it said Aug of 2025. 

[BuckWallace]

26 minutes ago, Byrds8 said:

Mine is a 2026 and yes, it's gas. As for build date, I think it said Aug of 2025. 

Keep us posted. My 2024 gasser has had the "whine" in gears ~3-6 since new. It hasn't gotten any worse and still shifts totally normal, so I haven't made a big deal about it to the dealer. GM-techlink says the following about the 10L80, so I wonder if it's a similar normal sound from the 10L1000s:

 

Reaction Gearset Whine

A whine from the reaction planetary gearset may be heard during light to moderate driving conditions, especially when the reaction gearset is in 4th or 5th gear (20-35 MPH) (32-56 KM/H). (Fig. 19) The frequency of the whine will change as the transmission shifts gears due to component rotation speeds changing. Use the manual tap shift feature to shift through the gears to verify which gears have a whine sound present.

TIP: A whine sound from the reaction gearset should not be present in 7th gear due to the 1:1 ratio and the gears being locked. If a whine is present in 7th gear, check other components.

[Byrds8]

Yeah I saw a tech service bulletin say the same thing. Gonna bring it up with then. Rather then not have to replace the transmission if it’s going to do the same thing. 

[BuckWallace]

2 minutes ago, Byrds8 said:

Yeah I saw a tech service bulletin say the same thing. Gonna bring it up with then. Rather then not have to replace the transmission if it’s going to do the same thing. 

Yes, I believe it's TSB 24-NA-262. I'm with you on not messing with it if a replacement isn't going to get rid of the noise. If mine were performing differently or getting worse I'd definitely bring it up, but it's still driving great so I don't want to mess with it. I'll probably at least bring it up to the dealer before I'm out of powertrain warranty, but for now I'm just going to keep enjoying the truck!

[Byrds8]

16 minutes ago, BuckWallace said:

Yes, I believe it's TSB 24-NA-262. I'm with you on not messing with it if a replacement isn't going to get rid of the noise. If mine were performing differently or getting worse I'd definitely bring it up, but it's still driving great so I don't want to mess with it. I'll probably at least bring it up to the dealer before I'm out of powertrain warranty, but for now I'm just going to keep enjoying the truck!

Yeah I feel you. I think I’ll bring this up and tell them we will be waiting on doing anything since it shifts fine. Unless they can produce something saying it shouldn’t be. That TSB didn’t seem to allude to doing anything.

On a side note, I want them to replace my driver side mirror again. They recently replaced it to stop a whistle. Now it tastes 2-3 seconds longer to fold than the passenger side. Figure Ill get a good one eventually lol