Comparison between GMC 1500 Sierra Denali and my 1794

enjoy your new rig, congrats

and ya I mean at some point gm has to fix the lifter bs, it’s been forever so maybe that’s it now

interesting you found the gm trans better than the aisin, not too many ever say that

 

After having driven both the ‘22 Tundra and the ‘23 Sierra for thousands of miles I’d say the transmissions are very comparable. I do wonder if a turbocharged engine makes a transmission smoother. It doesn’t always have to hunt for a gear with a little whoosh utilized.

 

I'm looking at new trucks and drove a gmc Denali 3.0 duramax last week. I like the truck part better than my tundra but try as I might, I just can't connect on the baby duramax. Fine around town. Gutless on up hill on ramps and passing at 70MPH. 6.2 is ok but the 24G tank with it is still a deal killer for me. Transmission seemed fine.

 

The diesel pull is different than the twin turbo. It’s just a smooth pull, diesel style. I miss the tundra’s zip but my 50+ year old brain is good with it.
The 24 gallon tank is just fine with the 3.0. I’ve seen DTE ranges over 700 miles.
I’d say the trucks pulled my 7000lb camper equally well.

 

The 24 gallon gas tank was a deal breaker for us until this aftermarket solution was on its way:


https://longrangeamerica.com/produc...cabcrew-cab-short-bed---50-gallon-replacement

 

My understanding is that the gas gauge is still screwed up? It was when I looked into the solution.

 

I think the gas gauge problem will be there with almost all makes and aftermarket solutions. The problem being it’ll say Full for a long time until it starts moving. It’ll move down to Empty at a similar rate as the factory gas tank. Then it’ll have a much larger “reserve capacity” at empty than the factory solution.

 

To me, it's horseshit to have a $75K truck with a Rube Goldberg gas gauge and non functional DTE. Doesn't matter in the 3.0 as it has plenty of range

 

Meh, I've had many diesels and drive a 6.6 often. I've never complained about passing power. There's just not much there, there with the 3.0 at highway speeds. Could I live with it? Maybe. Would I sacrifice some fuel economy for more go? Absolutely.

 

The 3.0 Duramax does have its own set of problems and is significantly more complicated. Just watch DemonWork's video on that coolant control valve on how complicated the cooling system is.

What I've observed on the forums is that when these design issues and flaws are brought up, most of those that do have the Baby Duramax say they're only keeping the vehicle for 3-5 years.

At least with the GM lifter issue, you can remove the head and camshaft without needing to remove the engine from the vehicle. Everything else in is easily accessible in the engine bay of a naturally aspirated V8. This would be similar to the F150 Lariat with the 5.0 Coyote. All of our current vehicles are turbocharged and we DIY almost all of our repairs and maintenance. I'm done dealing with that turbocharged nonsense.

Same. We test drove the LZ0 and didn't have an issue with the passing power.

 

I traded my 2023 Sierra SLT for a 2024 1794 Tundra and couldn’t be happier. I had driven GMC trucks for 18 years and was brand loyal, but I HATED my 2023. Electronics issues, infotainment system always causing problems, cracked transfer case housing, no real way to add bigger tires without a full 5”+ of lift, having to put premium fuel in that 6.2L and only getting 16-17 mpg…

GMC just didn’t get it right with this latest refresh.

 

I think with modern transmissions, it comes down to programming/shift algorithm. Ford and GM have a near identical 10 speed transmission in their light duty vehicles. There's very minor hardware variations, but those can't explain why Ford can't program the 10R80 (with the 5.0L) to be as smooth as the GM 10L80.

The best automatic transmission on the market right now is still the ZF 8HPXX series. When manufacturers get the programming of that just right, it's a downright beast of a transmission. I believe BMW's actual race cars use the exact same unit as their street vehicles - no modification required.

 

One thing about the Tundra that I (and especially my SO) couldn't get around is the Remote Start behavior of the Tundra. The pickup would have needed to stay outside since we have already have cars in our 3 car garage. The truck needing to shut off the engine when you opened the door was just a non-starter. The Tundra's refresh is too far away (with Toyota Safety Sense 4.0) that we don't think we would have been able to wait that long.

What is the biggest tire you could have fit on the SLT without needing any level/lift? Would you have been able to fit a 275/65/20?

 

i had one of the first ram zf 8 which a that time was imported from the factory in Germany

it was outstanding and so was the programming

the ford and gm 10s when I tested were clunky compared to the aisin 10 tundra

 

I have no problem with the Aisin transmission. I've test driven it in both the 2024 Tundra as well as the GX550. The GM's 10L80 in the 2024 Sierra SLT with the LZ0 and L87 were very smooth and the shift strategy seemed flawless.

When we test drove at least two 2024 F150 Lariats with the 5.0, the transmission shift strategy needed refinement.

I think there's far more of a difference in drivability between the Ford and GM transmission programming - despite being theoretically the same hardware design - than there was between the GM and Aisin.

GM's 10L80 runs ice cold compared to Ford's 10R80 and the Aisin. Probably because GM implements both a liquid to liquid and air to liquid cooler for their transmission relative to Ford. Ford only implements both a liquid to liquid and air to liquid cooler in their Raptor and Police Responder versions.

 

I've seen my 10 speed in the LZ0 eventually get up to 200 degrees when driving. PPE has a bypass valve, larger air to liquid cooler, and larger trans oil pan, but I've been holding off b/c I don't understand the ramifications of running the trans below expected operating temperatures.

Its quite obvious GM wants this LZ0 to run warm (210* F oil temperatures).

I only have 5k on this truck, so its way to early to say its any good. I do know that I think the GM truck is a well executed truck....a bit better than the Toyota...assuming nothing breaks. I did buy GM's extended warranty.

 

You'd likely need a level to get a 275/65. I kept the 275/60 size when I put Cooper Rugged Treks on it and even the AT tread made them VERY tight. That almost-vertical rear wall on the front fender well is HORRIBLE when it comes to upsizing tires.

 

My wife has a 2024 Yukon with the 6.2 engine-10 speed trans and I don’t think I’ve seen the trans temp get to 160 yet, even driving for 6 hours straight. I don’t know GMs much so not sure how yours differs.

 

I have not seen high transmission temps even when pulling. Now I’m curious and will monitor that more.

 

Been following this thread for a bit...Currently a VERY happy owner of a '20 Ram Limited EcoDiesel. Truck has every option/ i put 22x10 Fuels on it to make it mine....Truck has been flawless for the 5 years I have driven it. Government incents small business to flip vehicles every 5 years or so, so I have been looking. So far, nothing, I mean nothing, compares to the quality of materials, ride or drive of my Ram, including the new Rams (no more Eco), RHO sounds like a sick cow. The five year old side of me is pushing for a Raptor R, but I have been down the loud/performance road too many times and it always ends the same....So it is down to an Ultimate Sierra diesel or a 1794 Iforce Max. While the features of the Toyota are borderline impressive, there are some really s#itty interior pieces (center console doors, glovebox door) that are just begging to be annoying.
GMC side...22 gallon tank?!?! Running a 33 in my Ram now...Interior seems ok, but the seats seem small and the sunroof size just makes no sense in a '25 vehicle. Not sure what to consider next...?!?!?

 

Just got back from a 550 mile trip for a family Christmas. Got 31.0 MPG cruising between 65-75 with 5 adults and a bed full of clothes, presents, food, etc. Still have 150 miles showing forDTE. And this is WI weather with warm ups and winter fuel. The 24 gallon tank is just fine for the diesel.

 

Isn't the GM diesel gas tank capacity the same as the gas tank capacity - 24 gallons?

 

Sorry, mistyped that. Yes, 24.

 

Same. Last GM car I owned was a Saturn Sky. The passenger presence seat sensor (PPS) for the airbag went bad (poor design). The Pontiac Solstice and Saturn Sky community had to petition the NHTSA to do an investigation after GM said they weren't going to. We gathered thousands of instances where owners' PPSs failed. GM, under pressure from the NHTSA, finally did an investigation. Guess what? They issued a recall for the same PPS in the Cadillac, but said since Pontiac and Saturn were discontinued brands, they weren't going to issue a recall for them. Total BS...

 

First post on Tundras.com ..you KNOW what you want

 

These were from today. 51 *F out and windy. I was moving pretty fast for the east coast, but on a road trip, its not uncommon to see trans temps in the 190-200 *F range. I never see those temps in my commute, but that's just due to the fact that its only 20ish miles long.

 

I've been shopping around for a new truck since my Hi Country Silverado blew a couple lifters. GM was no help yet they wanted their mechanics to do the job. I paid a great mechanic shop to do the job using all gm parts. I wasn't looking for money because I was out of warranty. 61000 miles. I asked for their power components consumer letter to get an extended warranty. No way the answer. I did go look at the Tundras. I'm partial to the 1794 editions. After four new GM products, I'm ready to ditch GM.

 

they would not good will repair that at only 1K miles over the Powertrain Warranty?

no way, really?

 

So much for doing the right thing.