Transmission & Auto Services

  • Our goal is complete customer satisfaction
  • All makes and models, domestic, Asian and European
  • We’ll explain the repair options—you are part of the solution
  • ASE certified techs with over 70 years of combined experience
  • 12 months/12,000 mile warranty on most general repairs and transmission rebuild
  • Transmission repair is our specialty
  • Thorough knowledge of Diesel operations and repair capability


Body Repair & Collision Services

  • Our goal is complete customer satisfaction
  • All makes and models, domestic, Asian and European
  • Transmission repair is our specialty
  • Collision and frame repairs on most vehicles
  • We’ll explain the repair options—you are part of the solution
  • Free body estimates


$19.95 Oil Change:
We are currently running the following specials: $19.95 oil change (5qts of 10W30 and premium filter), $85 Diesel Oil Change (12QTS of 15W40 and premium filter) and $65 headlight Polish

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Auto Repair
We specialize in what others won’t!  We offer a wide variety of services for your vehicle to include all general maintenance to improve engine, drive train, undercar, heating and cooling, electrical components, transmission, and other miscellaneous services.  We are members of the Tech-Net network using the best quality Carquest parts.  This allows us to provide 12 months, 12,000 mile warranty on most parts.
Repair Services

Body Collision
Our staff has over 30 years of combined experience and is able to repair any vehicle on the road today.  We provide full collision, body repair and paint refinish using the OEM and Certified Automotive Parts Association (CAPA) certified parts.  We use PPG paint products which guarantees a high quality repair and allows us to offer a lifetime warranty.

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Fleet Repair

We are your go-to shop to help maintain your fleet!  We specialize in preventative maintenance and try to minimize costly repairs by identifying potential issues before they evolve into a serious problem.  It’s important to keep your fleet running, and with our fleet discount program we will help you maximize your bottom line.
Fleet Repair Services

Heavy Tow

Towing heavy loads in the Colorado altitude can really play havoc on your truck’s transmission.  We are able to set up your truck to maximize towing capacity while getting top performance at the pump and prolonging the life of your transmission and drive train components.
Heavy Tow Services



Hand M Transmission offers auto restoration services.
Auto Restoration

Diesel Emissions

Diesel Emissions

We provide Diesel Emissions testing and diesel repair services.
Diesel Emissions

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H & M Transmission is a full-service preventive maintenance and auto repair center that has been performing high quality, guaranteed (call for details) automotive repairs in the Castle Rock area since 2007. We service and repair all makes and models of domestic and import vehicles. We are your logical alternative to the dealership for all scheduled maintenance of your personal vehicle, fleet car or truck. Bring in your foreign and domestic auto, SUV, or pickup today with complete confidence that your vehicle will be serviced correctly while maintaining your manufacturer’s warranty. Click for the BBB Business Review of this Auto Repair & Service in Castle Rock CO
We offer discounts to military, emergency services personnel,  fleet repair, seniors and Douglas County School employees. Come see us, or give us a call, for more information! (303) 663 5578


H & M Transmission is an independently owned and operated full-service repair and maintenance facility. We use the latest diagnostic equipment to guarantee your vehicle is repaired or serviced properly and in a timely fashion. We only use quality replacement parts, and our technicians are ASE-certified. Experience the advantages that our independently owned service center offers you.