Your Trusted Shop for Automotive Repair in Johnstown and Boulder Colorado

Automotive repair when you need it the most! We provide best-in-class automotive diagnostics and repair services for Jeep, Toyota, Dodge, Ram, and much more. Visit us in Boulder or Johnstown Colorado.

Got a diesel truck? Check out our diesel repair page:

Diesel Repair Services

"I am a big fan of Johns 4x4 REV outfitters. They have been maintaining and modifying my wives 2015 Ford truck and my daughters 1995 Cherokee for the last 5 years. Smart recommendations and quality work!"

- Michael

Explore Our Repair & Maintenance Services:

Warranty Services & Factory Authorized Maintenance

Even while your vehicle is still under warranty, we can perform factory approved repairs. Our services include oil & filter, cooling, transmission, tune-ups, and other maintenance.

Engine Services & Performance

Diagnostic tests using state-of-art manufacturer and aftermarket tools and auto repair of engine and vehicle drive-ability issues

Oil leaks and coolant leaks
Timing belts and chains
Head gaskets
Fuel Injection - service and replacement
Exhaust systems
Emission systems and components
Computer updates/flashes

Suspension & Steering

It is critical to keep your suspension systems and steering components in top working order. Worn and loose components can cause serious safety and performance concerns.

Shocks and struts
Leaf springs, coil springs, steering stabilizer or dampner
Steering rack, bushings, and steering box
Ball joints, tie rod ends, drag link ends, track bar
Control arms and sway bars

Brake Systems

Diagnostic testing, Inspections and Repair of Anti-Lock Braking Systems, Disc and Drum Brake Service.

Drive-Train Systems

All the components that make your car go (besides the engine).

Clutch replacement
Transmission maintenance and replacement
Drive-line repairs
Axles and Differential services and repairs

Heater Core, Cooling, and Comfort Systems

Diagnostic testing and repair of systems that keep you and your vehicle at the right temperature.

Heater core replacement and repair
Coolant leaks, hoses, and radiators
Water pump and thermostat replacements
Heating and A/C repairs and charging

Electrical Systems

Diagnostic testing and repair of electrical wiring and systems.

Batteries
Starters
Alternators
Other charging systems (solar, hybrid systems, etc)

Wheel Alignment & Balancing

Making sure your vehicle drives straight down the road and does not pull one direction or the other and that your tires perform properly and last longer.

Improves vehicle handling
Protects from unnecessary tire wear
Eliminate any vibrations due to alignment and wheel balancing

Pre-Purchase Inspections

Before you purchase your next vehicle, take advantage of our Pre-Purchase Inspection. Our 63-point inspection includes a written evaluation and test drive which gives you the information you need to make an informed buying decision.

Schedule Appointment

Industry Leading Warranty

3 Year / 36k Miles

Nationwide warranty on parts and labor for 3 years or 36,000 miles on premium manufacturer and OEM parts giving you the peace of mind no matter where your destination or adventure takes you. Compare that to the standard dealership warranty of 12 months or 12,000 miles.

We got your back!

Our Promise & Warranty

Looking for an Auto Repair Shop near Johnstown or Boulder Colorado you can trust?

    
 
 
      Posted on Google  
   John Gonzales 
 8 October 2026
 
 
  New update, I have completed the 500 mile rear dif oil change and had the oil changed tire rotation and alignment. So far everything seems to be working great, I’ve been to other 4x4 shops but I am very happy with John’s 4x4, they’re the shop I trust and will continue taking my truck to them.

So far what was done, oil change BG products, tire rotation, and valve cover gasket are great. I'm just waiting for uca bushings to complete alignment.
  
 
     Posted on Google  
   Kelby Walsh 
 28 September 2026
 
 
  Trusted these guys when they told me what was good and bad with my car. No bs, no up sell, just good people doing a good job. Thank you team at rev for your excellent service and integrity!
  
 
     Posted on Google  
   Ethan Hunt 
 24 September 2026
 
 
  Very friendly
  
 
     Posted on Google  
   Nicholas Alexander 
 23 September 2026
 
 
  I had an issue with my 2023 Ram 2500 with the 6.7L Cummins, and I’m very glad I brought it to REV Outfitters in Johnstown. They were able to squeeze me in within a few days, while the dealerships in the area were quoting a minimum two-week wait.

From the beginning, they listened to my concerns, quickly diagnosed the problem, and presented multiple options based on my needs and how much work I wanted to have done. They took the time to clearly walk me through the entire process, what the job would entail, and what I could expect. There was no ambiguity or pressure.

They also provided recommendations for maintaining the truck and keeping it in great working condition going forward. Everyone I dealt with was kind, professional, efficient, and clearly took pride in the quality of their work.

I would definitely recommend REV Outfitters to anyone looking for a knowledgeable and trustworthy shop, especially for diesel trucks.
  
 
     Posted on Google  
   Matt Sendejo 
 22 September 2026
 
 
  Rev outfitters wad able to get me in and taken care of same week. Thanks for helping me out.
  
 
     Posted on Google  
   Dave Schiff 
 14 September 2026
 
 
  God is this place good.  I've taken a beater truck here that I've owned for 25 years to get repaired many times, when other shops don't want to bother.  And I've brought in a brand new 3/4 ton to get customized to the point that my wife almost left me.  In both cases (one vehicle I just wanted budget-friendly, effective repairs, and one where I wanted to go big), the repair and customization solutions they recommended and performed were incredible.  There shouldn't be a place that can do flawless bread and butter repairs reliably and affordably, but also do exotic builds where budget is less of an issue.  But that's what this place is.  I would probably leave my wife for John's, except it's a shop and not a lady.  And I'm not sure the marriage would hold up on paper.
  
 
     Posted on Google  
   James Veal 
 13 September 2026
 
 
  They rebuilt my 6 year old icon suspension system and did a great. The job did take a little longer than expected but that was due to technical difficulty with needles for pressurizing the shocks, and the shop did a great job keeping me in the loop. Would 100% recommend this shop for any off-roading needs.
  
 
     Posted on Google  
   Eric Edwards 
 5 September 2026
 
 
  Great guys, great work! The fella that drives the Subaru was especially helpful. Highly recommend taking your vehicle here.