Spied: 2016-2017 Chevrolet/GMC Duramax

KGP Duramax 8 II

We know the target for the 2015 Ford Power Stroke was to beat the horsepower and torque ratings of the 2014 Ram Heavy-Duty HO Cummins and the overall performance characteristics of GM's current 6.6-liter Duramax V-8 (offered in both the Chevy and GMC three-quarter-ton and one-ton pickups). But it looks like GM is getting ready to fight back, specifically with a newlytuned Duramax for its 2016 or 2017 HD pickups. Here's what our hot-weather-loving spy shooters have to tell us:

"We caught GM engineers testing several prototypes outfitted with an upgraded version of its Duramax turbo-diesel V-8 engine. We don't have any performance specifications at this time, but the goal must certainly be to bump the current 6.6-liter Duramax turbo-diesel's horsepower, torque and and towing capacity to counter Ford's recently upgraded 6.7-liter Power Stroke V-8 turbo-diesel. Ford's revamped 6.7-liter diesel currently outguns GM's 6.6-liter units — the Ford generates 440 horsepower and 860 pounds-feet of torque versus GM's 397 hp and 760 pounds-feet of torque of the Duramax.

"We don't know exactly what internal changes are in play on these latest GMC and Chevrolet HD prototypes, although our sources have reported that a more potent turbo and software upgrades are on tap for the 2016 model year. This fits perfectly with the evidence now spotted undergoing severe hot-weather testing in the California desert."

Deeper Breathing to Add Power

"We can clearly see that part of GM's strategy is to feed more air into the engine, via a new functional hood air-intake designed into the trucks' redesigned hoods. The new airduct sits prominently near the leading edge of the hood — the GMC gets a circular mesh intake grille while the Chevy appears to get a diamond-shaped interweaving mesh grille insert."

Definitely a Diesel

"You may be wondering how we can be sure that these prototypes were powered by GM's Duramax turbo-diesel engines. Here's how: We caught some of the prototypes tanking up and it was definitely diesel being dispensed into the truck. We also managed to zoom in tight on the fuel door, and it read 'Ultra Low Sulfur Diesel Fuel Only.' It's also worth noting that the test group had a Ford F-350 on hand as a benchmark vehicle, fitted with the 6.7-liter PowerStroke turbo-diesel V-8.

"We're hearing that more changes may ultimately be in store for GM's full-size trucks, with some additional, modest changes to the trucks' front fascias joining the redesigned hood spotted on these prototypes."

We'd also note that the diesel exhaust fluid tank, clumsily mounted underneath the front passenger door, looks like it has some bulky padding protecting or hiding something. This is the main piece of information regarding this camouflaged vehicle, meaning GM has tried to make it look like it's keeping the exposed tank in that location when we predict it will be moved to a less-exposed location. We're calling this box a decoy. Also, given the fact that there is no instruction or explanation about DEF on the fuel filler door, we assume GM will keep the filling spout underneath the hood in the engine compartment. We're also guessing GM will want to take the horsepower ratings above 420 and torque to the low-to-mid-800s. We'll know more later.

KGP Photography images


KGP Duramax 5 II

KGP Duramax 9 II

KGP Duramax 6 II

KGP Duramax 7 II

KGP Duramax 3 II

KGP Duramax 4 II



@TRX-4 Tom 1500 breadwinners? What did Ram win the best bread delivery truck award, cause that's bout all they can haul with them low payload numbers. Hell Ram 1500 trucks probably would make the best bread delivery trucks since Rams website clearly shows in black print that Ram 1500 trucks have the lowest ground clearance of all 1500s model trucks on todays market. Yeah them low slung, sports car type magazines like them Ram with the car coil springs in the back and no locker or limited slip rear differential to offer on them Ram 1500s make them only good for the concrete/pavement. Yup them low slung Ram 1500 highway cruisers are some real good pavement pounders. Yeah them Ram 1500s sell at highly discounted rates. Ram website says they will give you $7,000 off a crew cab truck and Fiat/Ram even came right out and said yesterday that (But second-quarter operating profit in the region fell 18 percent despite a 7 percent rise in sales, hit by higher incentives put in place to sell Chrysler models and a higher proportion of leasing deals, which offer lower margins than retail sales to individual customers.) Okay now I will finish this.







RAM 1500s BABY!!

Despite all the shortcomings and recalls looming over GM, I have to admit that these are some good looking trucks; in fact I like these a lot more than the last generation (GMT900). But I do think this horsepower/torque war among FCA, FMC and GM is getting way out of hand and can blow (the turbo) wide open. Trucks of this caliber should be about torque more so than HP and shouldn't be towing what a medium duty should tow... Speaking of, how about that Kodiak and TopKick 4500 - 6500, this time with the truck cab instead of a van cab? Looking a the tall front end of these trucks, they look like medium duties. Would like to see the 8- or 10-speed transmission behind the Duramax.


Still square wheel wells, come on GM the wheels are round.

Tom#3 - " Snow plows, a major snowstorm in a city you can make $3000 to $4000 a day."

How many vehicles does the guy have?

Snow plowing tends to occur at night because city streets and parking lots are usually empty. Depending on store hours one can count on operations to start around 9:00 PM to 6:00 AM. Basically you have a 8-10 hour window for clearing operations.
I don't know what the going rate is in the USA where you are from but even if one pulled $200 dollars an hour out of a hat - that would be 1,600 - 2,000 a night. I'm betting a more likely rate of $50/hour for a pickup. Do you have actual hourly rates to post? The other issue is consistentcy of work.

The problem with snow clearing with a pickup is it isn't heavy enough to move a lot of snow especially wet heavy snow. You run out of room to push it rather quickly and then what do you do to remove the accumulated snow?
In my part of the world pickups with snow blades are rare. One can purchase loaders too worn out for heavy industry but with great life for snow clearing at the price of a pickup with a blade. You then have the weight to literally move a ton of snow, you can easily pile it and all you have to do is higher dump trucks to haul the snow away.

My town has 2 areas where it piles snow removed from city streets. At the end of winter last year the snow pile was at least 50-60 feet high and covered a site a few acres in size. They use a D8 Cat to make the snow pile. We are heading into August and the snow pile has not yet melted away.

yea most use bobcats and dozers in my area since they can lift the snow up into taller piles without taking up nearly as much room. The ones that doe it with pickups usually is a crappier job with half the parking spots filled up with small piles of snow.

The problem with GM trying to play the numbers game with Ford and Ram is the fact that the current Duramax is at the end of its life cycle. How much more power can be extracted from this engine and it remain reliable? GM could be creating one more recall fiasco for themselves.
The Duramax has always had a good reputation for power and reliability. The "cost to run" being less than Ford or Ram. The Allison transmission has always given the GM an edge.

Tow and haul wars with 1/2 tons are a safe bragging bet because they tend to be used as family sedans. You push the tow ratings of HD's well into the commercial truck range and Mr.Civilian at the wheel does not have the skills or experience to handle it. I used to see a few wrecks a summer caused by geriatric drivers in these huge rigs trying to get "Alaska Highway" off of their bucket list especially when they chose to take the Stewart/Cassiar Highway.

It's good to see some ambition from GM. The hood scoop and even lower-hanging DEF tank borderline on hilarious. The Duramax has some easy power to add just like RAM and Ford have in the last couple years. Throw on a more efficient turbo and injectors and grab an easy ~50HP/100TQ. And will they finally put the DEF fill next to the fuel fill?

Can you say ugly! GM needs to work on all the crap under the truck... frame and tanks hanging down. Not to mention the biggest joke interior out there. Should have let GM tank, but instead it cost tax payers billions. GM will crash again.

@Chris, it came straight from the horses mouth. It was mentioned in one of the Chevy videos when discussing the LML.

@Chris The Duramax has been around since 2001 with no real big changes other then added emissions. GM could easy had more HP and TQ but probably won't be able to do it while being more fuel efficient at the same time.

A modest horsepower bump would probably have zero effect on the current Duramax's reliability. H&S took a LML to over 1000 rwhp with nitrous and tuning before bending a rod. I do think that emissions and efficiency would be the bigger hurdles.

What the general should really concentrate on is a HO gas in the 6.2 Lt engine range with DI and VVT like the new Ram HD 6.4lt Hemi! Just imagine a new 6.2 lt gas engine with Di and VVT like the engine in the new Vette! with something like 400+hp and 450ft/lbs tq! hooked up to the new 8spd tranny and you would really would have no reason for the diesel, except for really heavy towing like in the over 15K range! but with a lighter engine like that over the heavy diesel the load capacity would go up also!

@Chris The Duramax has been around since 2001 with no real big changes other then added emissions. GM could easy had more HP and TQ but probably won't be able to do it while being more fuel efficient at the same time.

Posted by: johnny doe | Jul 31, 2014 1:59:14 PM

^^This couldnt not be more factually wrong

The only similarity between the different generations of Duramax are the internal dimensions such as borexstroke, and arrangement/# of cylinders.

LB7 was the first generation dmax, it had scant emissions control and a normal wastgate operate fixed geometry turbo

LLY durmax added egr and other basic emissions controls, new cylinder heads moved the injectors outside of the valve covers, and added a variable geometry turbo

LBZ Duramax, completely new and upgraded engine internals making the bottom end of the engine even more indestructible as well as a re-engineered stronger engine block, as well as a bigger variable geometry turbo and significantly upgraded fuel injection system and electronics.

LMM Duramax, here is the only engine where your claim is remotely true, the LMM was basically just an uprated LBZ with DPF added to meet emissions laws, it only made ahandfull more horsepower and torque.

LML Duramax, again further internal and external hardware changes to up power over 15% from the previous generation as well as the addition of an exhaust brake integrated tot he turbo charger and the addition of SCR for emissions.

The Duramax name used by GM is not any different than Ford putting different engines under the powerstroke nomenclature. Pretty much the ONLY similarity in generations is the Duramax keeps the same displacement, but make no mistake the LB7 is not the same engine as the LLY, LBZ, LMM or LML any more than the 7.3 is the same engine as the 6.0, 6.4 or the 6.7l Powerstrokes.

Lou BC
I live in the lake effect snow belt in Pennsylvania where trucks with snow plows are very popular.
The guys that own a plow pickup are mostly retired with a lot of time on their hands and they spent a lot of money for their super duty 4x4 truck and Boss V Plow and they feel guilty what they paid when they don't get much of a chance to use it.
These guys watch the news and the weather forecasts and when a major city such as Washington DC, Baltimore, Philadelphia gets or is about to get a major Nor-Easter Snowstorm these guys get in plow trucks and head there for 2 or 3 days working non-stop almost 24 hrs a day making money plowing out business such as gas stations, stores, banks cause these people are in a panic when they get 3 inches of snow and everything shuts down. These guys are gone for 2 or 3 days plowing snow and they come back with $6000 to $8000 in their pockets! They charge $500 to plow out a McDonalds and thy can complete that less than an hour, so do the math at $500/hr. These guys even take credit cards or exchange free fuel and food as payment. They even made on the spot quick deals with the cities or towns they were in to plow the streets cause they don't have the plows. Their best customers are hospitals cause they are in a crisis if they are not plowed out and they even pay them to pick up the important people at their homes that need to work at the hospitals, that's where the BIG money is.

@Tom#3 - if you say so............

I'm constantly amazed at how disorganized the USA seems to be when it comes to looking out for their own.

BUT it is okay to spend half a billion dollars a day to have the military babysit a populace that will try to kill you at every chance.

Nobody have a better combined dmax and Alison ,,,what ford and dodge have problem to achieve,,

So ironic all these folks bitching that the US bailed out GM.

Obviously they haven't kept up with world affairs or realize that Henry Ford was a fond admirer of Adolf Hitler and the Nazis. For those who will say this is BS, there's even a photo of Ford receiving the Grand Cross - a golden Maltese cross embraced by four swastikas.

From the Free Library - in 1922 Ford began channelling funds to the Nazi Party, having almost certainly been "tapped up" as a prominent donor by either Hitler or one of his closest henchmen.

In 1938, five years after the Nazis rose to power, Ford received a special birthday present from Hitler. The Grand Cross of the Order of the German Eagle was the highest honor the Reich could bestow on a foreigner.

Ford proudly accepted it and never relinquished it - not even after Germany started the Second World War, not after America was attacked by Japan and Germany declared war on the US, not even after the full scale of the Holocaust was known.

Bailing out GM doesn't seem nearly as appalling to me . . . .

@awickedguy - I'd like to see the link to that information.

and BMW benefited from slave labour during WWII

history can be a real bitch but the victor gets to write the history books.

You GM guys don't have much to cling to.......... maybe that recall Tsunami has run its course.

. . . reverse flow cylinder heads like the 4.5 and possibly larger cubic inches.

awickedguy make sure to write all the facts!.

GM was doing exactly what Ford was:


"General Motors was far more important to the Nazi war machine than Switzerland," said Bradford Snell, who has spent two decades researching a history of the world's largest automaker. "Switzerland was just a repository of looted funds. GM was an integral part of the German war effort. The Nazis could have invaded Poland and Russia without Switzerland. They could not have done so without GM."

76 years ago is one story .. today is another. GM required bail-out because they are an inferior run company with inferior products.

I pe they bring back the médium-duty segment.

When they will bring back the médium-duty segment ?

A lot of useless comments. No one put 2 and 2 together. That DEF tank is obviously a fake. Why the picture of the fuel filler door? Maybe the next gen. Duramax doesn't need........


Another uneducated Ford poster talking about Governement motors etc... Who owes the government the most money? Not GM, not Dodge.... You figure it out.

I just hope GM bring back the médium-duty segment !!

I've had gmc for years,I've out pulled and out run any dodge or ford.if I'm going to spend $80 000 I want the dam thing to last

I certainly hope GM finds a way to keep under hood temperatures down besides ducting air through a bubble hood.
I would think air extraction vents might work just as well.


You sir are ignorant. Hemi is just short for hemispherical which is based upon sparkplug position. NOT THE SHAPE OF THE COMBUSTION CHAMBER!!!! And as far as diesel engines go, get a straight six. Theres a reason why the trucking industry doesnt use v8's. Takes longer for v8's to get peak torque versus an inline engine. The new Detroit DD15 which is an inline six 14.8L can achieve peak torque (up to 2050ft-lb) at 1100rpm. There hasnt even been a production v8 diesel for semis since late 80's eraly 90's. For the record, im a trucker.

Been in oilfield driven all three brands in the last five years all have good and bad but as far as the def tank last year in new f250 had a rock bounce up and shatter the cheap pump and downed the truck so clumsy placement or not yet to have that happen to a silverado

I own a 2011 Silverado Dually w/ the Duramax Diesel. Outstanding truck because I tow a 30' enclosed Trailer. I've been waiting for Chevy to upgrade to at least 440 hp /850 lb ft tq. I'll wait for 2017 before I trade in my 2011. I also hope they improve the DEF system too! With an analog gauge that I can see how much DEF fluid is left. Instead of relying on the computer display.

Why don't they call a spade a spade and dispence with a goat for a.name and call the ram a fiat

I haven't read anything about payload. I was very interested in the gmc one ton duelly, that is the truck I wanted till I found out it will not handle the weight of the slide in truck camper I want. How about coming out with a 450 to boost the payload capacity where I can use it?

Has anyone noticed the cabs getting smaller in the new trucks? I am 6'5" and the new dodge and ford are too small, my head is touching the ceiling and I can't see out the windshield. Especially the ones with moon roofs, the gmc is better but still doesn't fit right. Any other big guys out there notice? I have been told by salesmen it is because of fuel mileage, less wind resistance. I may have to buy a used truck so I can fit in it except I like all the bells and whistles of the new ones.

Not impressed. Already found out the duramax will not be getting any updates. No keyless start, no tpms for the dually, no better placement of the DEF fill spout, no gauge showing trany gear, lots of no from gmc. Just lots of small updates to the outside of the truck. Did they forget who buys trucks. Hard workers who want all the power they can get and all the easy things that make the truck work smoother. I was planning on getting one, but after all of the items I have been waiting for are left out, I might as well keep waiting since the difference from my 2013 3500 are only cosmetic.

Not impressed. Already found out the duramax will not be getting any updates or more torque or horsepower. No keyless start, no tpms for the dually, no better placement of the DEF fill spout, no gauge showing trany gear, lots of no's from gmc. Just lots of small updates to the outside of the truck. Did they forget who buys trucks. Hard workers who want all the power they can get and all the easy things that make the truck work smoother. I was planning on getting one, but after all of the items I have been waiting for are left out, I might as well keep waiting since the difference from my 2013 3500 are only cosmetic.

I have waited a whole year to get a new Duramax without the deff box under the front wheel. What happened to a 4x4 truck. I am a Chevy person being pushed to a Ram truck. My 2014 Silverado now has over 200,000 miles on it. I pull 5th wheel trailer in summer and snow machine trailer in the winter. When I am not pulling something I am off road hunting. Relocate the deff box so All sportsman can get back off road and enjoy the dirt road again. Asphalt gets boring to drive on.

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