My thoughts about the gas powertrain remaining unchanged

sdeeter19555 · August 30, 2016

3.73s with a diesel are a good combination for most. I had 4.10s in my last one and it was overkill for a mostly daily driven truck.

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Cowpie · August 30, 2016

That would be true. Diesel is going to get peak torque and do it's job at a lower RPM than a typical N/A gasser.

wcup102 · August 30, 2016

I believe you can get 3:73's if you want. The standard is 4:10's though. You may have to order one to get them though.

only if you get a diesel then the 3:73's are standard with the 4:10 option....ass backwards if you ask me lol

sdeeter19555 · August 31, 2016

only if you get a diesel then the 3:73's are standard with the 4:10 option....ass backwards if you ask me lol

No, in everything I experienced 3.73s would be about perfect behind a diesel. I had six 3.55 trucks with either autos or manuals, and one 4.10 truck...while the others were early generation Cummins and the 4.10 truck was a 3rd gen (electronic) making a lot more HP and TQ, the manual trucks with 3.55s towed very well and very strong for what they were.

Based on experience also, the cost in fuel between the two makes up for any "difficulty" towing once in a while with 3.73s...my 4.10s could get 20mpg (hand calculated), but you were a traffic hazard to do it. The guys with 3.73s were getting low 20s for mpg at 70mph, so it would pay to have the 3.73s for the fuel savings unless you towed heavy everyday (think hotshot driver).

It's all about the powerband...

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austingta · August 31, 2016

No, in everything I experienced 3.73s would be about perfect behind a diesel. I had six 3.55 trucks with either autos or manuals, and one 4.10 truck...while the others were early generation Cummins and the 4.10 truck was a 3rd gen (electronic) making a lot more HP and TQ, the manual trucks with 3.55s towed very well and very strong for what they were.

Based on experience also, the cost in fuel between the two makes up for any "difficulty" towing once in a while with 3.73s...my 4.10s could get 20mpg (hand calculated), but you were a traffic hazard to do it. The guys with 3.73s were getting low 20s for mpg at 70mph, so it would pay to have the 3.73s for the fuel savings unless you towed heavy everyday (think hotshot driver).

It's all about the powerband...

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I get 24 at 70 mph with only 3000 miles on it. 70 MPH does seem to be the sweet spot; it seems to get no better at 60. 14 in town. Power is way up from new as well.

sdeeter19555 · August 31, 2016

I get 24 at 70 mph with only 3000 miles on it. 70 MPH does seem to be the sweet spot; it seems to get no better at 60. 14 in town. Power is way up from new as well.

I had to force every Cummins I had to break in...trailer loaded to the gills and run the snot out of it for 500 miles. My 2004.5 didn't fully break in (based on mileage) until 50k miles...and again, I forced it. These diesels are meant to last and be worked.

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ShotgunZ71 · August 31, 2016

I get 24 at 70 mph with only 3000 miles on it. 70 MPH does seem to be the sweet spot; it seems to get no better at 60. 14 in town. Power is way up from new as well.

Mine is the same. 70 mph is the optimum for mileage. Anything above that and the mpg starts to dwindle. My city/town mileage is also low teens with trips less than 5 miles.

George C · August 31, 2016

Diesel fuel mileage is simple. The less boost, the better the mileage.

5lbs or less.

Once the engine needs boost to maintain, the fuel starts to burn as well.

George C · August 31, 2016

I had to force every Cummins I had to break in...trailer loaded to the gills and run the snot out of it for 500 miles. My 2004.5 didn't fully break in (based on mileage) until 50k miles...and again, I forced it. These diesels are meant to last and be worked.

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Diesel engines are fully broken in by 10k miles.

They may feel tighter because they are. EPA regulations won't allow as much fuel to hit the Pistons off throttle, which adds to the tightness feel.

Tolerances are built to spec, with engines close to blueprint, where gasoline Engines aren't nearly as tight, and fast gasoline burn off idle also makes for a looser feel.

sdeeter19555 · August 31, 2016

My experience tells me otherwise, sorry...

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Cowpie · August 31, 2016

Diesel fuel mileage is simple. The less boost, the better the mileage.

5lbs or less.

Once the engine needs boost to maintain, the fuel starts to burn as well.

that is very true. It takes fuel to generate boost, so the more boost you slap to it the higher fuel consumption. This is why many of us heavy duty commercial drivers monitor boost and EGT gauges religiously. There is a point where an engine overcomes rotational inertia and requires less boost to maintain a level of power and EGT's will stay at a nice level. That is a trial and error thing with every engine.

duramax041 · August 31, 2016

Id never buy a gas truck to tow again unless I live in the Midwest. I have 04 dmax with 79000mi and just got a 16 GMC 2500 HD .I tow a 5th wheel 13500# both r great.16 can tow 18000.only reason for the new 1 is exhaust brake and 10000gvw.

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wcup102 · September 1, 2016

Like I said, it would be a daily driver mostly with occasional towing of a boat or dump trailer. This is why the 4:10's and the mileage concern me and I cabn't justify the need or expense of a diesel

Big Whiskey · September 1, 2016

Like I said, it would be a daily driver mostly with occasional towing of a boat or dump trailer. This is why the 4:10's and the mileage concern me and I cabn't justify the need or expense of a diesel

If you're driving a 3:73 geared 6.0 now, you won't notice any mpg difference with 4:10, unless you're driving long distances over 80 mph. You might actually like how the new one drives better. It'll hold 6th gear on the highway better than the 3:73's.

wcup102 · September 1, 2016

If you're driving a 3:73 geared 6.0 now, you won't notice any mpg difference with 4:10, unless you're driving long distances over 80 mph. You might actually like how the new one drives better. It'll hold 6th gear on the highway better than the 3:73's.

Are you sure? Alot of posters say otherwise about what they get now. We have 2016 2500 double cab chevy at work and it seems to only get 10-11 but I chalk that up to who is driving and how. I drive 65-70 most of the time highway