Duernberger Diesel Service | KD Customs Diesel Engine & Machine — Local services in Iron Ridge

2006 GMC Sierra 2500HD - 6.6 Duramax with Allison Transmission. I checked around the area and heard several people tell me that Duernberger Diesel was a quality place to take a diesel truck for repair. I stopped in to see them in person. Eric met me at the front desk and was very knowledgeable and friendly. He walked me thru his shop to show the leave of professionalism this shop has. Eric then talked with me about the repair and within a day had a detailed estimate for me to approve. I had Duernberger Diesel perform these very in depth repairs on the truck. Eric communicated with me every step of the way and was very professional. The truck is now repaired and runs smoothly and flawlessly. The invoice matched the estimate on pricing exactly, with the only additions being things that i added along the way on the repair. I could not be any more happy with Eric and his team and professionalism. I also must note that when i picked up the truck it looked like brand new. It shined like i had never seen it shine before, and the engine compartment was spotless. I am a very picky and detailed person. These guys are top notch, and blew me away with everything. If you are from out of the area it is worth the drive to bring the vehicle to Duernberger as the level of service and professionalism far exceeds a longer drive for that service. I will be a customer for life with all of my...

I was looking for a rare part for a fuel system build on my Ford Super duty 6.7L Turbodiesel. It was a hard-to-find aftermarket part to go on the fuel pump. I had ordered it from another vendor, and found out a few days before my build was scheduled at the shop that it would not arrive in time. The other vendor promised a delivery date, and sold me a part they didn't have, and had no idea when it would come back in stock or ship out. I started calling around in a panic, and the great crew at Duernberger Diesel saved the day!!!!! They not only had the part in stock, but overnighted it to me as well so I had it in time for the build. Even though it was like, a $75 part, it would have held up a project costing thousands, and I would have lost even more money having the work truck down and out. Having staff like Duernberger go out of their way to provide excellent customer service is getting more and more rare these days. But, it makes a difference. I'll never do business again with the previous failed vendor, who basically blamed their parts supplier and told me to go pound sand.

Thanks again Duernberger, you guys are awesome, and...

I don’t often leave reviews, but this shop certainly deserves one. I’m so glad I found Eric on Facebook Marketplace while searching for diesel engine builders to rebuild my 5th Gen Cummins after an engine failure at 345,000 miles. Eric was incredibly professional and responded to every question I had, often within the hour—even on weekends. He provided a detailed, professional estimate via email and never pressured me like some other shops do with constant follow-ups.

I use my truck for hotshot hauling across the country, pulling heavy loads daily. The throttle response after the rebuild is remarkable—it’s like night and day difference. The truck also stays cooler when pulling up hills. They installed a 4th Gen-style long block, built with Speed of Air pistons, a Hamilton camshaft, and several other custom components tailored to my specific needs.

I’ve been to several diesel shops nationwide, and this one stands out as one of the best, thanks to their professionalism, craftsmanship, and...