No one knows transmissions & torque converters like

Sonnax designs, develops and manufactures the highest quality aftermarket automotive products. We are the world’s largest full-line supplier of torque converter parts, and offer transmission and specialty driveline components through a global network of parts distributors.

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View Sonnax Part Instructions

Enter a Sonnax part number below to view its instructions. For general reaming instructions, click here.

Latest News

June 26, 2019

Sonnax Closed for 4th of July

Sonnax will be closed July 4-5 in celebration of Independence Day. Have a happy, safe holiday filled with family, friends and fun!


May 22, 2019

Street Outlaws Tour Sonnax

We were thrilled to welcome a few of our favorite Street Outlaws to Sonnax! Chuck Seitsinger, Ryan Martin, Jeff Lutz, Javier Canales and Jeromie Hicks spent the day getting a behind-the-scenes look at how our top-quality transmission, torque converter and driveline parts are made. We had a great time, and we’re looking forward to seeing them in action at the track soon! 

See the full photo album on Facebook.


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May 06, 2019

What's Next for Vacuum Test Plates? You Tell Us!

Sonnax develops every new product with you in mind. With 11 popular vacuum test plates already available to help you find valve body problems 2X faster, we want to hear from YOU about which applications to cover next. 

Which plates would help your shop the most?

Vote Now!


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Enjoy a rewarding career and relaxing quality of life
in beautiful Southern Vermont.

Recognized as one of the Best Places to Work in Vermont and recipient of the Governor's Worksite Wellness Award, Sonnax is a leading supplier to the automotive aftermarket. We design, manufacture, test and distribute a wide variety of innovative, high quality products used to remanufacture torque converters, rebuild automatic transmissions, upgrade driveshafts and protect the driveline from over-torque damage.

Sonnax is one of the fastest growing companies in the state of Vermont. Our name has become synonymous with exceptional service, cutting-edge designs, technical knowledge and customer dedication. Join an exciting front-line team focused on developing and delivering the best products in the industry, a team whose imagination, hard work and results are rewarded.

Careers at Sonnax