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Getty's Garage I'm a Heavy Duty Diesel Mechanic and I like to make videos about Pick-up Trucks
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My name is Alex and I have been a diesel mechanic now for over a decade working on mostly highway tractors. in 2020 I started making videos about my own pickup truck and now enjoy making video about all pick up trucks diving deep into engine design and performance

07/15/2026

I Put GM's Biggest Truck To Work... Here's What Happened

I put the 2026 GMC Sierra HD 3500 6.6L Duramax Diesel to the test to see if it truly deserves the title of the ultimate heavy-duty work truck—towing, working on the ranch, and still looking pretty damn sharp around town.

Over the course of this review, we haul a loaded horse trailer through the Rocky Mountains, spend time working on a real cattle ranch, take a closer look at the legendary 6.6L Duramax diesel and Allison 10-speed transmission, and discuss whether this truck really lives up to its reputation as one of the hardest-working pickups on the market.

From towing performance and payload capability to ride quality, interior comfort, off-road confidence, and everyday drivability, this is a real-world look at what it's actually like to live and work with GMC's flagship heavy-duty truck. If you're shopping for a new HD diesel pickup or simply love trucks, this is one review you won't want to miss.

Would you choose the GMC Sierra HD Duramax over the Ford Super Duty Power Stroke or Ram HD Cummins? Let me know in the comments! 💬👇

07/15/2026

One Of GM’s BEST Duramax Decisions! 👏 Goodbye CP4 Fuel Pump

One of the smartest decisions GM made with the all-new 2017 L5P Duramax was ditching the troublesome Bosch CP4 high-pressure fuel pump found in the 2011–2016 LML Duramax. Instead, GM partnered with Denso and introduced the HP4 fuel system, which has now been on the road for nearly a decade.

While no fuel system is completely immune to failures, the Denso HP4 has earned a reputation for being far more dependable. In my opinion, it remains one of the biggest reasons the L5P Duramax has become one of the most reliable modern diesel trucks on the market.

What are your thoughts on GM’s switch to the Denso HP4 fuel pump? Let me know in the comments!

07/14/2026

Open vs Limited Slip Differential – Here’s How to Tell in 30 Seconds!

Not sure if your truck has an open differential or a clutch-type limited slip differential? Here’s a quick garage test you can do with the rear axle off the ground.

If both rear wheels rotate in the same direction, there’s a good chance you have a clutch-pack limited slip differential. If they rotate in opposite directions, you’re most likely looking at an open differential.

Keep in mind this is a general rule of thumb and works best for traditional clutch-type limited slip differentials. It isn’t the most accurate test for helical (Torsen-style) differentials, but it’s still a fast and useful way to get an idea of what you’re working with—or whether your limited slip is still functioning properly.

07/13/2026

The 5.0L Coyote V8 Screams to 7,000 RPM! 🔥

One of the coolest things about the Ford 5.0L Coyote V8 is just how willing it is to rev. In this clip, I put my foot to the floor in a bone-stock Ford F-150 and let the Coyote run all the way to its 7,000 RPM redline. The sound, the power, and the way this engine pulls on the top end is exactly why it’s become such an icon.

Thanks to its dual overhead cam (DOHC) design, the Coyote loves high RPM in a way that very few half-ton truck engines can match. As of 2026, I still believe the 5.0L Coyote is the best all-around engine you can buy in a half-ton pickup. That opinion could change as GM’s upcoming V8s arrive, but for now, the Coyote still wears the crown.

Would you take the 5.0L Coyote over every other half-ton engine? Let me know in the comments!

07/12/2026

At first glance, seeing a 3.42 rear axle ratio in a GMC Sierra HD Duramax Dually doesn’t exactly scream heavy-duty towing. Traditionally, I’d expect a more aggressive gear for a truck built to haul serious weight.

But here’s the catch: the 10-speed Allison transmission changes everything. With so many gear ratios available, GM can use a taller 3.42 axle while still delivering an aggressive overall final drive ratio in first gear when you need maximum pulling power.

In today’s heavy-duty trucks, it’s no longer just about the axle ratio—it’s the combined final drive ratio of the transmission and rear axle that determines how the truck performs when towing.

As a diesel mechanic, here’s why that matters.

07/10/2026

The L5P Duramax Is The MOST Reliable Diesel You Can Buy!

Hot take… but I think the 6.6L L5P Duramax is currently the most reliable diesel engine in the heavy-duty truck segment.

The 6.7L Power Stroke and 6.7L Cummins are both excellent engines, and each has its own strengths. But when you look at the L5P’s track record since its 2017 debut, the power it delivers, and the relatively low number of widespread engine-related failures compared to previous generations, there’s a very strong case that GM has built one of the best diesel truck engines on the market today.

As a heavy-duty diesel mechanic, this is just my opinion based on what I’ve seen in the industry. Agree or disagree? Let me know in the comments—which diesel engine would you trust to tow across the country?

Some trucks just look like they belong out here. 🌄The GMC Sierra 3500 AT4 with the Rockies as the backdrop. Hard to beat...
07/10/2026

Some trucks just look like they belong out here. 🌄
The GMC Sierra 3500 AT4 with the Rockies as the backdrop. Hard to beat a sunset like this.

07/10/2026

The LAST REAL Allison? 😳 L5P Duramax Transmission Explained

Did you know the 2017-2019 GM 6.6L L5P Duramax trucks came equipped with the legendary Allison 1000 heavy-duty 6-speed automatic transmission? This was a true Allison-designed transmission with a long-standing reputation for durability and heavy-duty towing.

Starting in 2020, GM switched to the 10L1000 10-speed automatic. While it’s marketed as an Allison transmission, it’s actually a GM-designed transmission that was co-developed and branded through a partnership with Allison rather than being a traditional Allison-built gearbox. It offers more gears, improved performance, and better fuel economy, but it has also faced more reliability discussions than the proven Allison 1000.

In this reel, I break down the mechanical differences and explain why many diesel enthusiasts still consider the 2017-2019 trucks to be the last HD GM pickups with a “real” Allison transmission.

Would you rather have the proven 6-speed Allison 1000 or the newer 10-speed 10L1000? Let me know in the comments!

07/09/2026

Can the Duramax Dually Conquer Canada’s Highest Mountain Pass While Towing 41 Feet?! 🏔️💪

How much does elevation affect towing? In this video, I hook up a massive 41-foot trailer behind the 2026 GMC Sierra 3500 HD Denali Ultimate Duramax Dually and head straight into the Canadian Rockies. We’ll climb Canada’s highest paved mountain pass at roughly 7,200 feet above sea level, putting the legendary 6.6L L5P Duramax Turbo-Diesel and Allison 10-speed transmission to a real-world towing test.

As a diesel mechanic, I’m looking beyond the spec sheet. We’ll see how the Duramax handles steep grades, high-altitude power loss, transmission performance, engine temperatures, braking, and overall towing confidence while hauling a seriously heavy load through one of the toughest environments in North America.

If you’re shopping for a heavy-duty truck or just love real-world towing tests, this is one you won’t want to miss.

07/08/2026

The 6.6L Duramax Hood Scoop Isn’t Just for Looks… It’s 100% Functional!

The hood scoop on GM’s current 6.6L Duramax diesel isn’t just there to make the truck look aggressive—it actually serves a real engineering purpose. Most of the engine’s intake air enters through the hood scoop before flowing into the airbox and feeding the turbocharged Duramax.

That design helps draw in cooler outside air compared to pulling hot air from the engine bay, and at highway speeds, it can also benefit from a slight ram-air effect. It’s one of those features that looks great while also improving the truck’s overall performance and efficiency.

As a diesel mechanic, I always appreciate when styling and engineering work together—and this is a great example.

What do you think of GM’s functional hood scoop?

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