The Diesel Podcast

John Muldoon from Muldoon’s Performance Transmissions joins us to talk about the biggest problem facing 68RFE’s in 2026. And it’s not what you think. He also tells us common mistakes that happen with transmissions and how we can avoid expensive repairs. Learn more about your ad choices. Visit megaphone.fm/adchoices

Salty Box Racing set a new diesel record and the team joined us from the track! We go behind the scenes at Speed Week 2026 and learn about their Cummins, challenges in the environment, and the thrill of competing at these intense speeds. Learn more about your ad choices. Visit megaphone.fm/adchoices

Are some factory engines beyond hope and just need a different engine entirely? Diesel Conversion Specialists joins us to take an in-depth look at all Cummins engines, which make the best swap candidates, and trucks that can benefit most from the conversion Learn more about your ad choices. Visit megaphone.fm/adchoices

Glory Days Speed Shop is back on The Diesel Podcast to talk about the latest updates to the Thunder Muzzle and the idea behind giving diesel truck owners control over their exhaust sound. Want an aggressive diesel exhaust when you’re getting on the throttle, but something quieter when cruising down the highway? We talk about how the adjustable muffler is designed to offer both, what’s changed with the latest version, and what they’ve learned from getting the product into the hands of diesel owners. We also get into the story behind Glory Days Speed Shop—from developing an idea and launching a new diesel product to growing the company and figuring out what comes next. If you like the sound of a straight-piped diesel but don’t necessarily want to live with it every mile, this episode is for you. Learn more about your ad choices. Visit megaphone.fm/adchoices

Power Service joins us to talk about biodiesel and what diesel truck owners need to know about the fuel going into their tanks. Biodiesel can offer benefits, but it can also create new challenges for your diesel fuel system. We discuss how biodiesel can contribute to microbial growth, fuel contamination, storage issues, and additional maintenance concerns that truck owners may not realize are happening inside the tank. We also cover what biodiesel blends mean for modern diesel engines, how fuel quality can affect filters and other fuel system components, and what owners can do to help prevent fuel-related problems. Learn more about your ad choices. Visit megaphone.fm/adchoices

Diesel injector sizing can get confusing fast. Percent over, hole size, liters per minute (LPM)—what do these ratings actually tell you, and how do you know which injectors are right for your build? Lenny Reed from Dynomite Diesel Products joins us to break down the different ways diesel injectors are rated and why comparing injectors isn't always as straightforward as the numbers make it seem. We talk about what “percent over” actually means, flow ratings, injector sizing, and why choosing the right injector needs to match the horsepower goals and overall setup of your truck. Whether you're building a Cummins, Duramax, or Power Stroke, understanding injector sizing can help you make better decisions before spending money on your fuel system. Learn more about your ad choices. Visit megaphone.fm/adchoices

Modern diesel engines generate a lot of heat, and keeping that heat under control puts a huge demand on the cooling system. But how often should you actually change your coolant, and what happens when you leave it in too long? Rislone joins us to talk about diesel cooling systems, proper coolant maintenance, and some of the common mistakes truck owners make. We discuss corrosion and contaminants that can build up over time, how coolant condition can affect heat transfer, best practices when changing coolant, and why maintaining the cooling system is so important on modern Cummins, Duramax, and Power Stroke engines. Learn more about your ad choices. Visit megaphone.fm/adchoices

Not all diesel fuel filters are created equal—and choosing the wrong one could affect your truck's performance, reliability, and even the life of your fuel system. On this episode of The Diesel Podcast, we sit down with S&S Diesel Motorsport Chief Engineer Ian McGiffen to discuss what separates a quality fuel filter from the rest. We cover filter media, micron ratings, filtration efficiency, common marketing claims, and why two filters that look nearly identical can perform very differently. We also dive into a common failure point on the 6.7L Power Stroke: the factory plastic fuel filter housing. Learn why it can crack, create fuel leaks, cause drivability issues, and why many owners are upgrading to a more durable solution. Learn more about your ad choices. Visit megaphone.fm/adchoices

What diesel parts are actually worth buying? In this episode of The Diesel Podcast, we bring together Fleece Performance Engineering and Domestic Diesel, a California diesel repair shop, for a unique conversation about the parts they see every day and the problems truck owners face. We discuss CP3 conversions, 6.0L Power Stroke replacement cylinder heads, electrical pigtails, common diesel truck failures, and how quality replacement parts can improve reliability. You'll hear both perspectives—the manufacturer designing the parts and the repair shop installing them on customer trucks. Whether you own a Cummins, Duramax, or Power Stroke, this episode is packed with practical information to help you make smarter decisions when upgrading, repairing, or maintaining your diesel truck. Learn more about your ad choices. Visit megaphone.fm/adchoices

Not all diesel parts are created equal. In this episode of The Diesel Podcast, we sit down with Snyder Performance Engineering to discuss the growing problem of copied and counterfeit diesel parts entering the aftermarket. We break down how legitimate American-made diesel components are reverse engineered, copied, and sold at lower prices, why quality often suffers, and what these knockoff parts can mean for the reliability of your Cummins, Duramax, or Power Stroke. We also discuss how counterfeit and low-quality replacement parts impact diesel truck owners, manufacturers, and the aftermarket industry as a whole. Learn more about your ad choices. Visit megaphone.fm/adchoices

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A Presidential Pardon closed one chapter—but according to today's guest, the conversation about diesel emissions enforcement is far from over. On this episode of The Diesel Podcast, I sit down with Jon Achtemeier who was convicted of Clean Air Act violations, served four months in federal prison, and was granted a Presidential Pardon this July. Whether you own a Cummins, Duramax, Powerstroke, operate a diesel repair shop, or simply want to understand how federal emissions enforcement has affected the diesel industry, this episode provides a firsthand perspective from someone who lived through it. Learn more about your ad choices. Visit megaphone.fm/adchoices

This week's guest shares his journey from working on diesel vehicles in the military to finally purchasing the Cummins truck he'd always wanted. We talk about why he chose a Cummins, the upgrades that transformed it into a dependable 500-horsepower daily driver, the parts he recommends, what he'd do differently, and the future plans he has for the truck. Learn more about your ad choices. Visit megaphone.fm/adchoices

Wade LaLone of Diesel Freak shares his story on today's episode. He takes us through the day EPA officials and law enforcement arrived at his shop, the years of uncertainty that followed, his federal felony conviction under the Clean Air Act, and ultimately receiving a Presidential Pardon. We discuss the emotional toll the case took on him, his family, and the diesel community, as well as why he says the pardon gave him the opportunity to move forward with his life. ➨ BECOME A PATREON: https://www.patreon.com/thedieselpodcast -------------------------------- Protect your privacy with ExpressVPN: Get 4 extra months FREE! Go to: https://www.expressvpn.com/diesel -------------------------------- 20% off HOT SHOT'S SECRET with code: DIESELPOD20 https://www.hotshotsecret.com/shop/ -------------------------------- 20% OFF KERSHAW KNIVES with code: TDP4020266 Discount code valid until September 1, 2026 20% off your entire cart at Kershaw Knives with code: TDP4020266 FREE Shipping over $50 *Offer valid through 9/1/26 at 11:59 pm Pacific. Discount is applied before tax and shipping. The discount code must be added at the time of checkout, it cannot be added retroactively. The discount is off entire cart. No substitutes, backorders, or additional discounts can be applied.* https://kershaw.kaiusa.com/ Learn more about your ad choices. Visit megaphone.fm/adchoices

Can you delete your truck now? Can the EPA still fine you? Did the recent EPA pardons actually change anything? In this episode of The Diesel Podcast, attorney Stewart D. Cables breaks down what the recent EPA pardons actually mean for diesel truck owners, repair shops, tuners, and the aftermarket industry. We separate fact from fiction and explain what changed, what didn't change, and what you should know before making any decisions. If you've been wondering whether diesel deletes are legal again, whether EPA emissions enforcement has changed, or what these pardons really mean, this conversation provides a factual legal explanation without the rumors or misinformation circulating online. Topics covered: • Can you legally delete your diesel truck? • Can the EPA still issue fines? • What the recent EPA pardons actually changed • What they did NOT change • How federal emissions enforcement works • What diesel owners and repair shops should know moving forward Stewart D. Cables is a founding partner of Hassan + Cables. Stewart specializes in general business representation and a variety of trial work. Stewart's practice areas include complex civil litigation, employment law, criminal and DUI defense, transactional work for corporations and LLCs, and counsel for non-profit entities. Stewart D. Cables is a founding partner of Hassan + Cables. Stewart specializes in general business representation and a variety of trial work. Stewart's practice areas include complex civil litigation, employment law, criminal and DUI defense, transactional work for corporations and LLCs, and counsel for non-profit entities. Stewart Cables E: stewart@hassancables.com P: 303-625-1025 ext.2 https://www.hassancables.com/stewart-d-cables -------------------------------- Disclaimer: This video is for general information purposes only. It is not intended to provide legal advice of any kind. No one should act, or refrain from acting, based solely upon the information provided on this podcast, without first seeking appropriate legal or other professional advice. ➨ BECOME A PATREON: https://www.patreon.com/thedieselpodcast Learn more about your ad choices. Visit megaphone.fm/adchoices

If you own a 6.7L Cummins, this is an issue you need to know about. In this episode of The Diesel Podcast, we talk with a professional diesel shop owner about the Cummins grid heater bolt failure, why it happens, what damage it can cause, the warning signs to watch for, and the repair options available before it becomes a catastrophic engine failure. ➨ BECOME A PATREON: https://www.patreon.com/thedieselpodcast Learn more about your ad choices. Visit megaphone.fm/adchoices

The 68RFE has been one of the most debated transmissions in the diesel truck world. Some owners have had great luck with them, while others start looking for alternatives as power levels increase or reliability becomes a concern. In this episode, we talk with a diesel shop owner about the ATS Allison transmission conversion for Ram Cummins trucks. We discuss why some owners are making the switch, how the Allison integrates with the Cummins platform, what the installation process looks like, and how it compares to the factory 68RFE and older 48RE transmissions. Learn more about your ad choices. Visit megaphone.fm/adchoices

In this episode, we're joined by the team from Rislone to discuss what oil additives are designed to do, why they were created, and the situations where they may benefit an engine. We talk about common engine issues, how additives interact with modern oils, misconceptions truck owners have, and what drivers should know before deciding whether to use one. Whether you own a high-mileage diesel, a daily driver, or just want to better understand what's inside the bottle, this episode takes a closer look at the role oil additives play in engine maintenance and performance. Learn more about your ad choices. Visit megaphone.fm/adchoices

We’ve heard reports of oil shortages potentially extending into 2027 due to supply chain issues. A diesel shop tells us if they are seeing any restrictions and if it could impact maintenance - and even engine repairs. Learn more about your ad choices. Visit megaphone.fm/adchoices

We’ve all heard of Shelby and the iconic history and performance of the brand. We were shocked to learn they are building F250’s! We chatted with them about build options and the inspiration behind the build for the F250 Super Baja. Learn more about your ad choices. Visit megaphone.fm/adchoices