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MAD TECH —
DIESEL WORKZ
8880 Archibald Ave Unit H
Rancho Cucamonga, CA 91730We specialize in Ford Light Duty PowerStroke Truck Repair
» Bumper to Bumper Diesel Truck Service, Repairs and Upgrades
» We also have many years of experience with Dodge Cummins and Chevy Duramax repairs
» Digital Inspections Now Available
Buying a used diesel? Get a full pre-purchase digital inspection — photos included. We walk the truck bumper to bumper and send you a clear, itemized report straight to your phone, so you see exactly what you're buying before you sign.
Ask about a pre-purchase inspection →714-470-7478
WHY MAD TECH
- Done right the first time. We never rush a job.
- No throwing darts. Careful, methodical diagnosis comes first — every time.
- 6 service bays to keep your truck moving.
- OEM parts: Backed by a 2-year / unlimited-mile warranty.
- NAPA parts: Covered by the NAPA 12-month / 12,000-mile warranty.
- All OEM filters in stock
- Large parts inventory — less waiting on your repair.
Diesel Truck Engine Services
Everything engine, done right. From check-engine diagnosis to full rebuilds, DPF service, and emissions repair — we diagnose carefully before we touch a thing.
- Engine rebuilding & diagnosis
- DPF service
- Emissions repair & diagnosis
- Cooling system repair & diagnosis
- Turbo replacement & diagnosis
- Check engine light diagnosis
See all engine services →
Trustindex verifies that the original source of the review is Google. Trenton and the guys at mad tech are true experts in their field. Took care of my truck and did it quickly. Highly recommend! I'll be back any time my baby needs a little tlcPosted onTrustindex verifies that the original source of the review is Google. I purchased a used 2014 Ram 3500 and needed to get it inspected for any outstanding issues. I have never owned a diesel before so I googled what coud go wrong with the 6.7 Cummins engine and brought the list in with the truck. Trenton went over every item in the list giving me a ballpark estimate of the possible future repairs. Left the truck for inspection and there were a number of items that needed to be repaired. Trenton gave me a wealth of information of what to look out for and how to drive the truck for maximun longevity. Mad Tech Diesel Workz is where I will be taking my truck for future service.Posted onTrustindex verifies that the original source of the review is Google. Highly Recommended! Trenton and the guys in the shop are very knowledgeable, answered all questions I had, and showed me what was wrong with the parts, rather than just saying they were bad. Will continue taking my trucks to Trenton and Mad Tech Diesel!Posted onTrustindex verifies that the original source of the review is Google. Huge thanks to Mad Tech Diesel Works for taking care of my truck and getting me back on the road quickly. They were honest about what needed to be done, kept me informed, and did quality work. It’s hard to find shops you can trust, and these guys delivered. I highly recommend them for any diesel repairs.Posted onTrustindex verifies that the original source of the review is Google. The tech has been helping me to keep my vehicles on the road for years.Posted onTrustindex verifies that the original source of the review is Google. I take my ram to MADTECHDIESELWORKZ for all things diesel! They are polite, no nonsense, professional, and fast. I recommend!Posted onTrustindex verifies that the original source of the review is Google. I called to ask about oil my trans rearend front axle transfer becouse they are all different with the exception of transfer case the same as transmission he took the time to call dealer to make sure he was right just don’t see service like this anymore I highly recommend this shopPosted onTrustindex verifies that the original source of the review is Google. I can’t say enough good things about Mad Tech Diesel Workz in Rancho Cucamonga! I took my 2018 Dodge RAM 2500 in after noticing some performance issues and I was blown away by the service I received. Trenton and Drew were incredibly knowledgeable and it took them a few minutes from the time I arrived to tell me what the issue was. They didn’t just fix the problem they explained everything in a way that made sense, which I really appreciated as someone who needs their truck but isn’t a mechanic. The shop itself is what you would expect and clearly run by people who care about what they do. They got my truck in quickly, fixed my issue and a few other things and had it back to me faster than I expected!! The pricing was fair, and they even pointed out a couple of maintenance items I should keep an eye on to avoid bigger problems down the road. No pushy upselling, just honest advice from folks who know diesel engines inside and out. My truck’s running better than it has in months, and I’m already planning to bring it back for routine maintenance. If you’re looking for a diesel mechanic who treats your vehicle like their own, Mad Tech Diesel Workz is the place to go. Highly recommend them to anyone with a diesel truck in the area or even if you’re not from the area. They’re worth the drive. Trent/Drew thanks for what you do!Posted onTrustindex verifies that the original source of the review is Google. Guys are super helpful
Diesel Truck Transmission Services
Fluid service, shift kits, rebuilds, and replacements for automatics and manuals — built to hold up to diesel torque.
- Automatic transmission service & rebuilding
- Transmission replacement
- Shift kit installation
- Transmission coolers
- Manual transmission & clutch service
See all transmission services →
Diesel Truck Chassis Services
Suspension, brakes, steering, driveline, and the upgrades that make your truck work harder — towing, lighting, and hitches.
- Suspension repair & shock replacement
- Brake replacement & service
- Power steering & hydro-boost service
- Driveshaft & U-joint service (moved here from transmission)
- Differential service & repair
- Hitch installation (gooseneck / 5th wheel) & trailer wiring
- Auxiliary & LED lighting
See all chassis services →
Fleet Truck Service
We are proud to serve the following commercial fleet accounts:
Finnco Services, BD Construction, American Eagle, Pacific Propane, American Heavy Moving, Apex Imaging, Arrowhead Timber Structures, Big Block Construction, Transporter ME, Extreme Concrete, I&M Construction, Pacific Survey, Premiere Trailer Repair, Straightline Excavation and Grading, Tropical Pools, American Pools, Mobile Medical, Mark's Mobile Trucks, Sierra West Construction