2025 Ram 2500 High Output Mega Cab vs 2025 GMC Sierra 2500 Denali Ultimate

Everybody has their own preference when it comes to trucks, so let us get right into the details and figure out which of these luxury giants might be the perfect fit for your driveway.

What is Different on the Outside? Cab Space and Suspension

First off, let us talk about size and stance. I mentioned the Ram is a Mega Cab, and it truly is the biggest cab you can get in a pickup truck right now. When you open the back doors, the extra spacing is massive. You even get reclining rear seats, which is a feature exclusive to the Mega Cab. If you want the ultimate roomy ride for the family or the crew, the Ram delivers. However, keep in mind that the Mega Cab only comes with a 6-foot 4-inch bed.

On the GM side, the 2500 Denali Ultimate features a standard 6-foot 8-inch bed, with an 8-foot long bed option available. While the back seat in the GMC is still incredibly spacious and comfortable for a full-grown adult, it does not quite match the cavernous feel of the Ram's Mega Cab. If you have bulky car seats to fit, that Mega Cab makes a noticeable difference. You can also check out our denali ultimate.jpg file for a closer look at the GMC's slick exterior styling.

When we look underneath, General Motors uses traditional leaf springs for the rear suspension on the Denali Ultimate. The Ram, on the other hand, utilizes rear coil springs and even offers an optional factory air suspension. What does this mean for you driving around Pennsylvania highways? The GM truck is going to tow heavy weight much better and feel more planted under load. The Ram is going to ride significantly nicer when it is empty, but it might not handle as cleanly as the GMC when maxed out with a heavy trailer.

Digging into the Engines: Cummins vs Duramax

The big story under the hood is the engines. The Ram features the Cummins High Output six-cylinder turbo diesel paired with their newer 8-speed automatic transmission. This setup cranks out 430 horsepower and an incredible 1,075 pound-feet of torque. It is an absolute torque monster.

Over in the General Motors camp, you are looking at the 470 horsepower 8-cylinder Duramax turbo diesel paired with a 10-speed transmission. You can see the engine layout in the duramax.jpg file. The GMC gives you more horsepower but slightly less torque at 975 pound-feet.

Because the GM has the 8-cylinder engine and the 10-speed transmission, it is going to be noticeably quicker off the line. The shift patterns are smoother, and you do not stay in each gear as long. The Ram, with its six-cylinder and 8-speed transmission, lingers a bit longer between shifts. Fuel efficiency is pretty close, but the GMC tends to get a mile or two better per gallon on the highway, hitting around 18 to 22 mpg, while the Ram hovers around 16 to 20 mpg. When towing heavy, you can expect 10 to 13 mpg in the GMC and 9 to 12 mpg in the Ram.

Stepping Inside: Ultimate Luxury

Let us jump inside these trucks. The Ram Limited interior is gorgeous with black leather seats, a massive infotainment touchscreen, and even an available passenger screen. It also features a dual-zone climate system, heated and cooled seats, a heated steering wheel, and a premium 17-speaker Harman Kardon sound system. The Mega Cab really shines here with those reclining rear seats, making long road trips a breeze. A slight downside to the Ram is the storage layout when the seats fold down, as it creates an uneven hump that can make sliding cargo like suitcases a bit annoying.

Inside the Denali Ultimate, you are greeted by the signature dark chocolate brown full-grain leather with white piping. The GMC takes luxury a step further with full massage seats featuring adjustments for your upper shoulder, side bolsters, and lower lumbar. The cabin is filled with rich wood grain and just feels slightly more solid and less plasticky than the Ram. While the touchscreen is big, it is not quite as massive as the Ram's setup. However, the camera system on the GMC is slightly superior, giving you incredible towing views and hitch angles. You can compare the interior vibes by checking out the denali vs ultimate.jpg file.

When it comes to price, both are premium investments. The Denali Ultimate sits in the mid to upper 90s, roughly 95 to 98 thousand dollars brand new. The exact Ram Limited we looked at had a window sticker over $101,000, making it the more expensive option.

Both brands have built incredible, fully loaded pickup trucks with massive diesel engines and capable transmissions. Do you want more horsepower and massaging seats, or are you looking for max torque and the sheer size of the Mega Cab? It all comes down to personal preference. Stop by our lot at 4126 Oregon Pike in Ephrata, PA, and let us know which one you would choose!