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ATS Of Janesville, DBA Automatic Transmission Service

About Us

Automatic Transmission Service brings over 27 years of trusted expertise to transmission repair and rebuilding throughout southern Wisconsin. Specializing in domestic vehicles, we deliver dependable solutions designed to restore performance and extend the life of your vehicle. Our services include thorough fluid replacement, detailed pan inspections, and advanced hot flushing to ensure optimal transmission operation.

Every transmission rebuild follows a precise, hands-on process—complete disassembly, careful inspection, and replacement of worn components with quality parts—all backed by a comprehensive warranty for your peace of mind. Conveniently located in Janesville, WI, we proudly serve Janesville and surrounding communities with a long-standing reputation for quality workmanship, honesty, and reliability. Contact us today for expert transmission solutions you can count on.

Our Professional Associations

Chamber of Commerce

Our Certifications

Insured

What We Offer

Our Specialties include:

ATS of Janesville and Rock Diesel of Milton have built their reputation on honest, dependable auto repair and service. Their technicians take pride in handling everything from routine maintenance to complex mechanical issues, treating every vehicle as if it were their own. Whether it’s diagnosing a problem, making a necessary repair, or providing preventative care to keep vehicles running smoothly, they combine skill, precision, and true customer-first service. Drivers trust them because they don’t just fix cars—they keep families, workers, and businesses moving with reliable workmanship and a commitment to getting the job done right the first time.

Our Services include:

Transmission Services, Diagnostics & Rebuilding: ATS of Janesville and Rock Diesel of Milton specialize in keeping your drivetrain performing at its best. From routine transmission service to full rebuilds and replacements, their technicians bring years of expertise to every job. They use advanced diagnostic equipment to pinpoint issues accurately, saving customers time and money. Whether your vehicle needs a simple adjustment, a complete overhaul, or anything in between, their team makes sure it shifts smoothly and reliably.
Full-Service Auto Repair: Both shops provide a complete range of automotive repair solutions designed to keep vehicles running strong. From everyday fixes to complex mechanical work, their technicians can troubleshoot problems quickly and get customers back on the road with confidence.
Engine Repair & Maintenance: When an engine isn’t running the way it should, these teams are equipped to diagnose the cause and restore its performance. They handle everything from minor repairs to major internal work, ensuring engines operate efficiently, safely, and with maximum longevity.
Oil Changes & Preventative Maintenance: Routine maintenance is at the heart of vehicle health, and both locations offer fast, thorough oil changes to protect engines from wear. Their preventative services help extend the life of every vehicle and reduce the likelihood of costly repairs down the road.
Alignments, Brakes & Rotors: To keep customers driving safely, the shops provide precision wheel alignments along with complete brake system services. Whether it’s new pads, rotors, or resolving issues with stopping power, their technicians make sure every vehicle handles and brakes the way it should.
A/C Service & Repair: From refrigerant recharges to full component replacements, their A/C services ensure drivers stay comfortable in every season. They diagnose cooling issues accurately and restore systems so they perform efficiently and reliably.
Servicing Most Makes & Models: Whether it’s domestic or import, gas or diesel, everyday driver or work truck, ATS of Janesville and Rock Diesel of Milton have the tools and experience to service most makes and models. Their technicians are committed to providing dependable repairs for the vehicles their customers rely on every day.

Our Brands include:

Transtar
Certified
GOEREND

Testimonials

On 3/30/2026 Jayson Williams had this to say:
I recently took my 2017 Chevy Silverado here as I thought I was starting to have some torque converter problems. I installed a tune that I purchased online and it turns out that it wasn't that great and didn't actually do anything to the TCM. Mason and his techs were extremely knowledgeable and went to great lengths in diagnosing the truck, and ended up putting their own custom tune on it. The truck is now the best driving vehicle I've ever owned, and I could not be happier! My parents have also has transmissions replaced here on a couple of their vehicles and we happy with ATS' work as well. If me or friends and family ever need transmission work done in the future, ATS is my easy go-to.

On 7/15/2025 Richard Heine had this to say:
Janesville transmission service is the best to the best they go out of their way to make sure things are right and they work With you and your time of need

On 3/16/2025 M.G. Bumpus had this to say:
Great knowledgeable service with a smile.....

On 4/24/2024 Sharon Judd had this to say:
The dreaded engine light went on in the Toyota Matrix and our mechanic said take it to the dealer. The dealer wanted $200 to access the issue and most wanted about the same. I knew the issue was related to my trans so I called ATS since several people at my gym recommended them. They did an amazing job for me. My car drives like new. The only issue, ATS is VERY busy and there could be a wait, but the wait is worth it. Very knowledgeable and honest. Highly recommend.

On 10/25/2023 Connie Vanderlinden had this to say:
We just want to say what a great job Mason did to get our Denali back on the road, where two other shops were unable to get it done. He went above and beyond and we are very thankful for that! A thank you to everyone that’s had a hand on the repair. We give you a 10/10. And we will highly recommend your shop. Kevin & Connie Vanderlinden

Contact Us

ATS Of Janesville, DBA Automatic Transmission Service
4365 Milton Ave Janesville, WI 53546
Phone: (608) 754-7737
Email: shop@atsjanesville.com; atsjoand@gmail.com

One Mile North of I-90 and Highway 26

Where To Find Us

Payment Types Accepted

Visa, MasterCard, American Express, Discover, Debit Cards

Our Hours

Holiday Hours May Vary. Please Call For Details.

Monday: 8:00 AM - 5:00 PM
Tuesday: 8:00 AM - 5:00 PM
Wednesday: 8:00 AM - 5:00 PM
Thursday: 8:00 AM - 5:00 PM
Friday: 8:00 AM - 5:00 PM

News

🚗 Keep your ride running smooth with our full-service auto repair expertise! From transmission repair 🔧 to engine tune-ups, we've got you covered. Need a transmission replacement or just a quick auto repair or service? Our skilled technicians will troubleshoot your issues fast and get you back on the road with confidence. Drive in today for top-notch care for your car's heart and soul! 💪🔩

🚗 Gear up for the best auto service in town! Whether you need Transmissions, Transmission Repair, Transmission Replacement, Engine Repair, or overall Auto Repair and Service, we've got you covered. Drive smooth with top-notch care. Visit us today!

Expires 1/12/2027

FAQ

What transmission services do you offer?

We provide complete transmission diagnostics, service, rebuilding, and replacement for most makes and models—automatic and manual.

What other auto repair services do you provide?

In addition to transmissions, we offer engine repairs, oil changes, brake and rotor service, alignments, and A/C system repairs.

Do you service all vehicle makes and models?

We service most domestic and import vehicles. Contact us to confirm if we can work on your specific make and model.