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Are Diesel Swaps Worth it in 2026?

Are Diesel Swaps Worth it in 2026?

The Diesel Podcast Apr 14, 2026 57 min
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About this episode

Jeremy from Diesel Conversion Specialists breaks down why diesel swaps still make sense in 2026—less about chasing power numbers and more about building a truck that matches your goals. He shares his path from heavy equipment to diagnostics to conversions, emphasizing the “finality” and pride of creating something unique. The conversation covers common hurdles (especially wiring/harnesses, PCM/ECM matching, and grounds), what to consider before buying parts (vehicle condition, gearing, transmission choice), and why standalone common-rail harnesses are opening up older builds. They also preview upcoming hardware like a high-mount AC system.

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Technical Too Afraid to Ask
Company

DFC diesel

"Welcome to the diesel podcast presented by DFC diesel. Jeremy, welcome to the diesel podcast."

This is the name of the company behind the podcast. Since the show is about diesel swaps, it probably has something to do with building or supporting diesel-conversion projects.

Concept

diesel conversions

"I'm looking forward to chatting with you, learning about diesel conversions. I've been getting not a few guests recently that have done them and they have questions."

A diesel conversion is when you change a vehicle so it runs on a diesel engine instead of its original engine. It usually takes more than just swapping the engine—you have to make the fuel system and electronics work too.

Concept

common rail engine

"you always kind of loved or you always wanted to, you know, have in your driveway, but you want to be able to add power to it or add, you know, a common rail engine"

A common-rail diesel is a modern type of diesel engine where fuel is pressurized and delivered to the injectors in a controlled way. People like it because it usually runs smoother and can make more usable power.

Concept

heavy equipment

"[111.3s] As time progressed, I found myself running heavy equipment. [115.9s] So that's where I kind of where I got the diesel bug from is is operating"

Heavy equipment is the big construction machinery used to dig and move dirt. Diesel engines are common in these machines because they’re built to work hard for long periods.

Term

diesel's grunt

"[124.8s] two or three yard bucket and getting big old hogs of dirt out of the ground [129.3s] and listening to those diesel's grunt."

People call it a diesel’s “grunt” when the engine sounds and feels like it’s pulling with force, especially at low speeds. It’s part of what makes diesels popular for heavy work.

Term

injectors

"...the fundamentals of the operations of those engines [180.1s] replacing the injectors."

On a diesel engine, injectors are like the fuel “sprayers.” They control how much fuel goes in and when, so the engine can burn it cleanly. If they’re not right, the engine can run rough or not start well.

Term

diagnostics

"[323.1s] But I learned that. [326.9s] You you're doing diagnostics and you're you're able to make repairs."

Diagnostics is how a mechanic figures out what’s actually causing a problem. Instead of guessing, they check the vehicle’s data and run tests to find the real fault.

Term

diagnostic code

"You get a you get a diagnostic code and then you you go through the diagnostic trouble tree to find your answer."

When something goes wrong, the truck’s computer saves an error code. Mechanics use that code to figure out what part or system is causing the problem.

Part

NP 205 transfer case

"And then I threw a NP 205 transfer case behind it. So yeah, you know, that hard, like go get her cast iron transfer case behind it."

The NP205 is a transfer case that sends power to both axles. People like it in swaps because it’s built tough and can handle a lot of power.

Term

TPS signal

"We lost like a TPS signal or something like that, where it just lost power and it couldn't move."

TPS means throttle position sensor. If that sensor signal goes bad, the engine computer may not know how much power you’re asking for, and the truck can lose power or get stuck in a safe mode.

Concept

diesel swaps

"It's like we have this cool truck and now we're sitting on the side of the road... conversions where like with some of them... nobody else has done this..."

A diesel swap means taking a gas (or different) engine out of a vehicle and putting a diesel engine in its place. It’s not just “bolt in and go”—you have to match a bunch of systems so the truck can run reliably.

Term

6-0 12-ounce swaps

"...when he took over diesel conversion specialists, that's when they were doing largely the 6-0 12-ounce swaps at that junction of the company."

It sounds like they’re talking about a specific type of swap they did a lot, but the exact engine names got garbled in the transcript. The takeaway is that they had a common, repeatable swap setup.

Term

common rail harness

"So we now make a standalone common rail harness. And since we were, since we came out with that, it's been, there's been a lot more push for those guys using them in different applications."

A common rail harness is the wiring kit that helps a common-rail diesel engine work in a different vehicle. It’s designed to match the engine’s sensors and connections so you don’t have to wire everything from scratch.

Term

adapter plates

"With adapter plates, yeah, that's the next thing. Do you want an automatic? Do you want a manual transmission?"

Adapter plates are the brackets that make two parts fit together in a swap. They help the engine and transmission connect correctly so everything lines up and works.

Term

turbos

"like say a company that builds turbos or something, they'll say, well, have a power number in mind, and then, you know, it'll work now or you can grow into it"

A turbocharger helps the engine make more power by pushing extra air into it. The idea is to plan your build so the engine can handle more power later, not just immediately.

Concept

tuning

"like say a company that builds turbos or something, they'll say, well, have a power number in mind, and then, you know, it'll work now or you can grow into it, or same thing with like tuning or injectors or something like that."

Tuning is changing the engine’s settings so it runs the way you want. People often start with a safer tune first, then upgrade later as they add supporting parts.

Term

VE pump

"...you are learning a VE pump. If just selecting an engine, you go, well, what about, what about a, you know, what about the VE pumps?"

A VE pump is an older-style diesel fuel pump that meters fuel mechanically. People talk about it in swaps because it’s usually less electronics than newer systems, but it still needs to be in good shape.

Concept

education

"So that's really, it's really cool and I think special in the diesel industry is the education..."

They’re saying the best part of doing a diesel swap isn’t just the finished truck—it’s learning how it all works. That knowledge helps you handle issues if anything comes up.

Term

plasma tables

"Well, you know, they got their fabricators, their builders, they have, [1492.7s] they have plasma tables they have access to. And the next thing you know, their trucks, their trucks"

A plasma table is a machine that cuts metal with a super-hot electrical arc. Fabricators use it to make custom metal parts quickly and accurately.

Term

rebuild an engine

"It's so it's so rewarding. It's [1578.0s] hard to describe like that that feeling, you know, when you if you rebuild an engine and you and [1583.2s] you're and you're turning that key for the first time, why you're you're listening,"

An engine rebuild is when you take the engine apart and replace worn parts so it runs like it should again. It’s more than a quick fix—it’s restoring the engine’s internal health.

Term

remanufactured engines

"They have a complete lineup of Cummins, Duramax and Powerstroke remanufactured engines that are set to a standard of ISO 9001 2015 standards..."

A remanufactured engine is an engine that’s been rebuilt and brought back to a set standard. It’s usually a safer bet than buying a random used engine because it comes with testing and a warranty.

Concept

ISO 9001 2015 standards

"...set to a standard of ISO 9001 2015 standards, which is a huge deal in the aftermarket."

ISO 9001 is a quality standard that companies use to prove they have consistent processes. Here, it’s being used to suggest the reman engines are built with controlled quality steps.

Term

warranty

"...with an industry leading warranty, that's really comprehensive."

A warranty is the guarantee that if something goes wrong, the company will help cover repairs. With swaps, having warranty coverage can reduce the risk if the engine isn’t right.

Company

fast fuel systems

"That's why fast fuel systems remove air and vapor up to 99% of water and filters debris down the two microns."

Fast Fuel Systems makes add-on fuel filters/water removers for diesel trucks. The goal is to keep the fuel cleaner so the engine’s fuel system doesn’t get damaged.

Concept

do it in stages

"So with a like the kit builders, it's something where somebody can do it in stages, like you'd mentioned, sometimes it's father, son, father, daughter, they're doing it in stages, they can see, okay, this is everything I'm going to need, but this is where I'm going to start,"

Doing it in stages means you don’t finish the whole swap at once. You can start with the basics, get it running, and then add the rest later.

Concept

thousands of dollars sucked into a truck that still isn't operational

"...next thing you know, they're, they're, they're thousands of dollars sucked into a truck that still isn't operational."

This is the nightmare scenario: you spend a lot of money and the truck still won’t work. Swap projects can cost more than expected when things don’t get sorted out the first time.

Concept

reputable shops

"It's something we try to, over the years, we've tried to develop like a list of reputable shops. So when a customer calls us, like it's like, well, no, we're not, we're not taking on a build..."

A reputable shop matters because a diesel swap is complicated. The right shop helps prevent surprises and makes sure the truck actually works after the work is done.

Term

power steering pump

"Their power steering pump was, was pretty low in the, in the chassis. So we went ahead and made a bracket to raise that up."

The power steering pump is what helps your steering feel lighter by pushing fluid through the system. In a swap, its location can become a clearance problem, so builders may change brackets or pumps.

Term

wiring

"There's always, always wiring. We're always, we're always coming up with something in wiring. That seems to be a never, never ending area for, for diesel conversion specialists."

In these swaps, wiring is the electrical work that makes the engine talk to the truck. It’s a big job because there are lots of sensors and connections that have to match up correctly.

Car

Volkswagen Jetta

"I put, I put a TDI in a 97 Toyota Tacoma with a manual transmission. And it was from a 2006 Volkswagen Jetta, [2909.8s] that, that, that application."

They’re saying the diesel engine they used originally came out of a 2006 Volkswagen Jetta. The donor car is important because it affects what parts you get “for free” when doing the swap.

Concept

daily driver

"I think, the thing I love about, like what we talked about today is the ability to create something. And [2962.1s] yeah, I think once we kind of get like our daily driver out of the way"

A daily driver is the vehicle you rely on for everyday commuting and errands. The speaker’s point is that once the daily driver is sorted, it’s easier to take on a bigger project like building an “ultimate truck.”

Concept

kit

"that would be where I would get stuck. So I love that you guys put that into a kit to be able to tell me exactly what I need so I can build that vehicle I have."

A “kit” is a pre-planned bundle of parts for the swap. Instead of guessing what you need, the kit helps you get the right pieces so the conversion is more straightforward.

Company

Patreon

"I also want to give a shout out to some of our Patreon supporters, Robert, John, TSW, Diesel, all of our other Patreon supporters..."

Patreon is a website where fans can financially support a creator on an ongoing basis. The hosts are giving a shout-out to people who help keep the podcast running.

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