Grayless Automotive & Performance

Official Logo for Grayless Automotive & Performance featuring a stylized gauge and piston 'G' design, representing ASE Master Certified auto repair and GM specialization in Clinton County.
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Clinton County’s Trusted Choice for Auto Repair & Performance

Grayless Automotive | GM Specialists & Repair | Clinton County

Experience dealer-level quality backed by 20+ years of ASE Master Certified expertise right here in Clinton County.

ASE Master Certified

With over 20 years of experience, our ASE Master Certified technicians provide dealer-level diagnostics and repair you can rely on

Affordable Prices

We offer a cost-effective alternative to the dealership. We build relationships, not just tickets.

An industrial-style graphic for Grayless Automotive, featuring a mechanical handshake made of gears and steel with a central dollar sign, symbolizing affordable and honest pricing.

Quality Service

We don't believe in guesswork. Our expert team uses advanced diagnostics to identify the root cause and fix it properly, backing every job with integrity.

A silver Chevrolet Corvette raised on a professional lift for performance tuning at Grayless Automotive in Clinton County, featuring a clean workshop with a prominent American flag.
Macro close-up detail of a high-performance GM engine engine bay at Grayless Automotive, highlighting precision mechanical components, metallic textures, and clean assembly.
Interior of Grayless Automotive & Performance showing a silver Chevrolet Corvette on a professional Rotary lift. The clean workshop features a large American flag and organized tool stations.
About Us

Family Owned,Performance Driven

Founded by Braden and Tabby Grayless, we bring over 20 years of ASE Master Certified expertise home to Clinton County. We are dedicated to providing honest, dealer-level quality for your daily driver and specialized performance tuning for your GM toys—all backed by our promise of integrity.

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Happy Customers
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Years Of Experiences

Engine Repair & Rebuilds

We handle what others can't. Trust our ASE Master Certified team for complex internal engine repairs and rebuilds.

CUSTOM FABRICATION & WELDING

Fully equipped with TIG and MIG capabilities. From custom turbo kits to stainless steel and aluminum fabrication, we build exactly what your project needs.

Advanced Diagnostics

Stop guessing with parts stores. We use dealer-level diagnostic tools to pinpoint the root cause of your check engine light.

Brakes & Suspension

Safety meets performance. Expert brake service, lift kits, and suspension upgrades for all makes and models.

Our 3500hp-rated Mainline Hub Dyno

precision tuning with our Mainline Hub Dyno

We utilize a state-of-the-art Mainline Hub Dyno, rated to handle up to 3500hp. By connecting directly to the hubs, we eliminate wheel slip for the most accurate data possible. *Dyno rental is available for outside tuners and race teams. Please inquire for rates and scheduling.

A red Chevrolet Corvette connected directly to a blue Mainline ProHub Dyno system for precision engine tuning at Grayless Automotive.

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OUR EXPERTISE

COMPLETE CARE FOR EVERY VEHICLE

Whether you need a simple brake job on your daily commuter or a full engine build for your Corvette, we have the skills and equipment to handle it. We bridge the gap between affordable local service and high-end performance shops.

  • Dealer-Level Diagnostics
  • Brakes, A/C & Suspension
  • LS/LT Engine Specialists
  • Family Owned & Operated
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MAINTENANCE & REPAIR

"A stylized 3D silver metallic check engine light icon with a red lightning bolt in the center, representing engine diagnostics.

DAILY DRIVERS

Check engine lights, A/C repair, brakes, and suspension. We keep your family safe on the road.

PERFORMANCE BUILDS

Industrial metal icon featuring a mechanical gear and turbocharger element with a rising red graph line, symbolizing increased horsepower and performance upgrades."

PERFORMANCE SPECIALISTS

Cam swaps, superchargers, ECU tuning, and custom builds for late-model GM and other vehicles.

Brayden Grayless, owner of Grayless Automotive, wearing branded coveralls and hat, is actively working on the engine of a dark grey Chevy Tahoe with a wrench. He is under the open hood in the shop, with Haltech and Valvoline banners visible in the background.

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ASE MASTER CERTIFIED

EXPERT AUTO REPAIR & PERFORMANCE UNDER ONE ROOF

Stop overpaying at the dealership. We combine over 20 years of experience with advanced diagnostics to get your vehicle running at its peak. Whether you need routine maintenance or specialized tuning for late-model GM vehicles, we do it right the first time.

ASE Master Certified Technician

Advanced Engine Diagnostics

Late-Model GM Specialists

We Value Integrity Over Income

Quality Service
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Customer Satisfaction
100%
Testimonial

Our Client Reviews

Don’t just take our word for it—see why Clinton County trusts us with everything from their daily commuters to their high-performance builds.

Had my 2018 Camaro SS 1LE worked on by Braden at Grayless Performance, and I couldn’t be happier! He installed a BTR 225 camshaft along with a few other upgrades. The communication was excellent — Braden always responded within 10–15 minutes or less. Super professional, friendly, and clearly knows his stuff. The shop is spotless and even has a hub dyno. Highly recommend Grayless Performance for anyone looking for quality work and top-notch service!

    Connor Leech

    He did a differential rebuild on my 01’ Sierra great communication through the whole process and great finished product. Couldn’t be happier

      Nathan Bower

      You'd be crazy to take your GM car anywhere else! Knowledge and experience abound here! whether you're looking for performance maintenance or standard repairs, this is the only place to bring your vehicle! A+++

        Mark N Pyatt

        I can’t thank Braden enough for working on my VW TDI. He was efficient, fairly priced, honest, and my car now runs better than it did when I bought it 3 years ago. He has taken more time and care in one service than a big dealership has in 3 years with our vehicle. We will be bringing all of our vehicles in for work in the future!

          Kiersten Hoffman

          Highly recommend for your automotive needs. Had the rear-end gears changed on my Ford 8.8. Very professional!

            Tanner Reagan

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            Owners Braden and Tabby Grayless standing in the Grayless Automotive workshop in front of a silver Chevrolet Corvette. Braden is wearing mechanic coveralls and Tabby is in a branded company polo.