Peterbilt 378 Vs. 379: What Is The Difference Between Them?

When considering the top semi-truck brands, Peterbilt and Mack are always on the list. When the company introduces new truck models, they are frequently nearly identical. Only the interior and a slight upgrade to the features differ.

Two of the most famous models of Peterbilt are 378 and 379. Since they were released virtually simultaneously, there aren’t many differences between them. The 378 and 379 were produced in 1986 and 1987, respectively.

The design, engine, and features of several Peterbilt models are the options that help us to differentiate. For example, on the 378, the cab is 2 inches higher than on the 379. Additionally, the 379 has an aluminum hood, while the 378 has a fiberglass hood.

So Peterbilt 378 vs. 379, which one will you choose? Before making any decision, more pieces of information are needed. So read this article thoroughly.

Peterbilt 378 Overview

One of the US trucks with a classic look is the Peterbilt 378. From 1987 through the 2007 model year, it served as Peterbilt’s primary pickup truck while maintaining the touch longnose style of the nameplate. In addition, you can find high back seats and an intuitively built dashboard inside the 378 models.

peterbilt 378

The 378 can be customized in various configurations, from heavy haulers to over-the-road tractors. In addition, it’s likely to be available in black, tan, or gray. Unfortunately, Peterbilt does not offer the “2006 Dash” in black anymore.

A Detroit Diesel engine with 420 HP is used in this model 378. On a 378, the hood and fenders were made of single-piece fiberglass moldings. And to provide complete access to the engine, the fiberglass hood is tilted 90 degrees.

The 378 has only been offered with a set-forward or set-back axle. And it has a 119″ bumper to the rear of the cab hood length.


●      Eaton Fuller 18-speed transmission

●      Simple frame

●      Double differential lock

●      Cab with AC


●      High fuel cost

●      Short nose

Peterbilt 379 Overview

The Peterbilt 379 has unquestionably earned its position as a true transportation icon. It replaced the Peterbilt 359 in the late 1980s, and for the entire 20 years it was produced, it was Peterbilt’s best-selling model.

peterbilt 379

These long-nosed Peterbilts are still attracting attention on roads worldwide, living up to the legend that never died. Even after being phased out in 2007, the Peterbilt 379 remains among the most sought-after truck models on the used truck market.

The Peterbilt 379 is a vehicle built for convenience and efficiency. Thanks to the extra-large cab and curved dash, every control is within easy reach and in line with the eye. The Peterbilt 379 is also outfitted for maximum comfort with a roomy, soundproof riding cab sleeper system.

Having some of the comforts of home while traveling in a Peterbilt 379 is possible. The Peterbilt 379 offers four basic detachable sleeper sizes.

You can not match the variety of engines available for the Peterbilt 379 model. The Detroit Diesel, Cummins, and Caterpillar engines are available for the Peterbilt 379. Moreover, truckers can use both types of transmission fluid, and Dexron oil is supported by 378 or 379.

The experience of long-distance trucking in a vintage Peterbilt wouldn’t be complete without a traditional communication method. Though sometimes Cobra 29 LTD shows antenna warning, it is standard equipment on many Peterbilt 379 trucks.


●      Best-selling model

●      Customizable according to preference

●      Durable and comfortable

●      Long nose


●      Basic headlights

●     Traditional cabs and sometimes air chamber problems occur

Comparison Between Peterbilt 378 Vs. 379

Peterbilt 378 and 379 are the two most popular designs offered by the company. They both have some standard and unique features. The special features are what make them comparable.

However, you cannot purchase both at once. You must know the variations to compare and select your best option. Let’s take a quick look at some pointers. We will discuss some key differences between these two units in this section.


Whenever we decide to buy anything, design or exterior is the first thing that comes to mind. Though the same company manufactures both, they do not have much variance in this sector.


The only difference that has caught our sight is the fiberglass hood in Peterbilt 378. On the contrary, Peterbilt 379 has an aluminum hood.


Nobody wants to compromise with comfort. You are buying a truck for heavy work and long roads. So it is a must.

As we have said in the beginning, these two models do not have that much difference. But in the case of comfort, Peterbilt 379 is the winner.


You have lots of room for control and comfort in the Peterbilt 379. The cab is roomy, and the dash’s curved shape keeps everything within range and in plain view.

Platinum, Accent, Prestige, and American Class interior trim options are available for the 379. However, Peterbilt 378 does not offer you all of these options.

Sleeper Size

There are different possibilities for sleeper size in Peterbilt 379. A power inverter, extra storage, cupboards, TV bracket mounting capability, audio management, and rear climate control are other sleeper features that can be pretty useful for extended periods on the road.

On the other hand, Peterbilt 378 offers you a little less sleeper size. It’s known to have a short nose sleeper.


The more recent models offer several updated features. The reliability of the more recent models is superior to the older ones in all areas, including the headlights, material, proportions, H7 or H8 batteries, interior, built-in, and safety technologies.

But both Peterbilt 378 and 378 are old models. They both have basic headlights. The only difference is in the hood material. Peterbilt 378 has a fiberglass hood, while 379 has an aluminum hood.


The production of both trucks ended in 2007. So it is not possible to buy a brand new one. But you can always find a used one. As they are rare to find nowadays, they do not follow the market price determined before.

Peterbilt trucks are expensive, like Freightliner and international’s trucks, for a transport entrepreneur. Still, Peterbilt 379 is a little bit more expensive than Peterbilt 378. That’s because of the extra comfort and engine quality it provides.

A Comparison Chart Between Peterbilt 378 Vs. 379

Here is a comparison table to make it easier for you to choose between the two vehicles faster.

FeaturesPeterbilt 378Peterbilt 379
Weight18500 lbs19600 lbs
Hood MaterialFiberglassAluminum
Engine UsedCumminsDetroit Diesel, Cummins, Caterpillar, and many more
Sleeper CabShort noseLong nose
PriceLess expensiveMore expensive
Hoods119 BBC119 BBC and extended 127 BBC
Transmission TypeManualAuto

Which One To Choose?

Before deciding between two truck models, you must be sure of the features you want in a truck and the purposes for which you want to use it.

We have placed before you all the slight differences between these two trucks. But if you wish to buy a better one and afford the extra cost, we suggest you go with Peterbilt 379.

Given their minimal variance, it makes little difference whether you pick the 379 over the 378 or vice versa. You may be proud of the fact that, whether you select a Peterbilt 378 or 379, you’ll be operating a classic vehicle.

Final Words

The Peterbilt 378 and 379 are both trucking monarchs. Both will provide you with a multitude of amenities. However, you will have different preferences as usual.

Which truck you should buy ultimately depends on your experience. You can choose between the Peterbilt 378 vs. 379 with this help. It all comes down to aftermarket modifications and driving style. Hope this essay makes it simple for you to decide. So, don’t wait any longer and buy that truck you’ve always wanted!