Diesel pickup in a professional repair shop
Serving Fort Lupton & North Denver Metro Since 1998

Auto Repair
in Fort Lupton, CO

Done Right.
Rated 4.5 Stars by Customers

Complete auto repair and vehicle maintenance in Fort Lupton — engine diagnostics, brakes, oil changes, transmissions and more.

Mon–Fri · 8AM–5PM
Fort Lupton, CO
27+ Years Experience
ASE Certified
Family Owned
Advanced Diagnostics
Fleet Service
Who We Are

Your Fort Lupton Service Center for Maintenance & Repair

Colorado Transmission & Diesel Specialists has been a trusted auto shop in Fort Lupton for over 27 years. We're a family-owned, ASE-certified service center built on honest diagnostics, transparent pricing, and automotive repair that lasts — from routine maintenance and engine diagnostics to major transmission and diesel work.

Local drivers have rated us 4.5 stars across 115+ Google reviews, and most of our work comes from repeat customers and neighbors who send us their family and coworkers.

27+
Years
ASE
Certified
4.5★
Rated
Learn More
Vintage classic car on the lift inside the CTDS shop in Fort Lupton
Classic Restoration

Frame-up rebuilds and vintage drivetrain work.

Restored green Chevrolet Camaro inside the CTDS workshop
Performance Builds

Muscle car tuning, transmission swaps, and dyno-ready setups.

Your Vehicle, Your Choice

Three-Category Repair System.

We diagnose everything, then prioritize the work with you before we touch your vehicle. No surprises, no pressure — just honest options.

Safety / Immediate

Issues that affect your safety on the road — brakes, steering, tires, suspension failures. We recommend addressing these right away.

Preventative / Coming Soon

Wear items that aren't urgent today but will be soon — fluids, filters, belts, hoses. Fixing these now prevents bigger bills later.

Non-Safety / Down the Road

Cosmetic or non-critical items you can plan around your budget. We'll log them and follow up at your next visit.

What We Do

Complete Auto Repair Services

CTDS is a full-service auto repair shop in Fort Lupton, Colorado. Our ASE-certified mechanics handle everyday automotive repair — brakes, suspension and steering, air conditioning, cooling systems, batteries, tune-ups and engine repair — alongside the transmission work we've been known for since 1998.

Every visit starts with real engine diagnostics rather than guesswork, so you know what your car or truck actually needs before anything is repaired. As a local automotive repair shop, we service most makes — Chevrolet, Ford, GMC, Ram, Honda, Toyota and more — and we also take care of Cummins, Duramax and Powerstroke owners who need diesel work. If you've been comparing repair shops in the area, we'd like to be the service center you keep coming back to.

Transmissions

Transmissions

Diagnostics, full rebuilds, clutch replacement, and manufacturer flaw correction — our specialty for 27+ years.

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Diesel

Diesel

Cummins, Duramax, and Powerstroke — fuel systems, turbos, and performance done right in Fort Lupton.

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Fleet

Fleet

Keep your trucks earning with priority scheduling, preventative programs, and fleet inspections.

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General Auto

General Auto

Brakes, suspension, AC, diagnostics, tune-ups — one trusted shop for everything you drive.

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Oil Changes, Wheel Alignment & More

Routine maintenance is the cheapest repair you'll ever pay for. We keep Fort Lupton vehicles on schedule with fast oil changes using the correct grade for your engine, fluid and filter service, battery testing and replacement, brake inspections, cooling-system flushes and complete tune-ups.

Uneven tire wear, a pull to one side, or a steering wheel that sits crooked usually points to suspension and steering trouble — bring it in and a mechanic will inspect the front end and steering components and tell you exactly what's worn. Paired with engine diagnostics, that keeps small issues from turning into major auto repair bills later.

Core Values

What We Stand For.

Honesty

We tell you what your vehicle actually needs — and what it doesn't. No upsells, no scare tactics.

Transparency

Clear written estimates, photo documentation when it helps, and a real conversation before any work begins.

ASE Expertise

ASE-certified technicians with decades of experience across transmissions, diesel, and complete auto repair.

Family-Owned

Locally owned and operated in Fort Lupton since 1998 — we treat your vehicle like it belongs to family.

Testimonials

What Our Customers Say

4.5
(115) Google reviews
Mike Baird
2 months ago

Just needed to say how great these guys are. I am so impressed with this shop — they rebuilt my 10-speed automatic in my truck and it runs perfect.

Barbara Clayton
3 months ago

Peter and the crew were very professional. They fixed my car and got me back on the road at a great price!

Crazy Insane
3 months ago

These guys know what they are doing! Excellent service, my truck is back on the road and driving great, thanks!

Roger Sampsel
4 months ago

I can't express how satisfied I am with the attitude, helpfulness, honesty and friendliness I experienced dealing with this shop.

Tyler Becker
6 months ago

Doug runs this place in tip-top shape. Very honest and knowledgeable crew. They stand behind their work. My dad has used them for years.

Grant Wachter
8 months ago

Amazing service. Quality work — you can tell these guys are experienced. Very professional, I won't take my truck anywhere else.

LaRae Wacker
8 months ago

Thoroughly pleased with their work. Easy to communicate with, got my transmission changed in just a couple of days.

Rachel Palko
8 months ago

Super nice owner. They were speedy and kind. Thank you!

Dave G
11 months ago

Doug and his staff are some of the most honest and straightforward people in the industry. I have had two major repairs done here.

Michael Henderson
11 months ago

I'm a small business — I rely on my truck 100%, putting 5k a month on it. If I have a problem they get it in as fast as they can.

Dick Richard
11 months ago

The staff at Colorado Transmission & Diesel Specialists showed exceptional honesty, friendliness, and courtesy.

Danny Miles
1 year ago

All I ever got here is great service.

Michael Potter
1 year ago

Doug helped me out after another transmission shop did a terrible job. Done a great job, never been happier.

Thomas Greenburg
1 year ago

Doug and his guys make a great shop. I have had a lot of work done here. The service has been great. Highly recommend.

Greg Salyer
1 year ago

I do not usually put reviews on websites but I wanted to share with everyone what a great job the guys at Colorado Transmission did.

Levi Kuehn
2 years ago

My overall experience was very positive. I called in with my concern about my differential. They guided me through the process.

Aaron Cochran
2 years ago

Doug and his team are great to work with. Doug has rebuilt all my transmissions, from my race transmission to my daily driver.

Jessica Rodell
2 years ago

The only place I will take my vehicles to be serviced! Honest, trustworthy & super professional business. Keep up the great work.

Taylor
2 years ago

I took my Acura into this shop for some mechanical issues. I was nervous about the cost — the owner took the time to walk me through it.

Jesse Abad
2 years ago

Brought pickup for repairs. In and out in 3 days. Will be coming back with all repairs I need. Awesome crew.

Jim Allen
2 years ago

Repaired our 1992 Jeep master cylinder on short notice. Good to work with, fair price.

Ben Pearson
5 years ago

Always helpful.

Matt Collins
5 years ago

Doug was absolutely fantastic to work with. He actually picks up the phone and is happy to answer any and all crazy questions.

Nick's Tree Service
5 years ago

Smart, honest mechanics. Helped me on my diesel truck and saved me money over the corporate dealership.

Featured Work

Real Trucks. Real Repairs.

A look inside the CTDS shop in Fort Lupton — transmission rebuilds, diesel engine work, and fleet jobs we've turned around for Colorado drivers.

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Transmission rebuild in progress at CTDS Fort Lupton
Diesel pickup on the lift for engine service
Cummins diesel engine bay diagnostics
Fleet truck preventative maintenance
Performance transmission build on the bench
Inside the CTDS shop in Fort Lupton, Colorado
FAQs

Frequently Asked Questions

Quick answers about auto repair and maintenance from Fort Lupton drivers. More questions on our FAQs page.

We're at 1021 Denver Ave, Fort Lupton, CO 80621 — serving Brighton, Firestone, Erie, Frederick, Hudson, Dacono, Greeley, and the wider North Denver Metro. Mon–Fri, 8AM–5PM.
Visit The Shop

Find Us In Fort Lupton.

Drop in, call ahead, or send a message — we're easy to reach and easy to work with.

From The Blog

Tips From The Shop Floor.

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Fort Lupton, CO

Ready When You Are.

Call us directly or request service online — we'll get you in fast.

Visit Us

Find Us & Hours of Operation

Working Hours

  • Monday8:00 AM – 5:00 PM
  • Tuesday8:00 AM – 5:00 PM
  • Wednesday8:00 AM – 5:00 PM
  • Thursday8:00 AM – 5:00 PM
  • Friday8:00 AM – 5:00 PM
  • SaturdayClosed
  • SundayClosed
1021 Denver Ave, Fort Lupton, CO 80621
(303) 655-3738