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.
Where to Buy
View Sonnax Part Instructions
Enter a Sonnax part number below to view its instructions. For general reaming instructions, click here.
Sonnax will be closed Monday, May 27 in observance of Memorial Day.
TWO THUMBS UP. I am a loyal user of Sonnax products and they are a company that puts their customers first. Thank you for great products, and I look forward to future products!
B. Cole, Toronto, ON
Slip Yoke T3-3-2431CBH
TH400, 4L80-E, Powerglide with 32-spline. For use with roller bearing tail housing.
Which Kit is Right for Your Rebuild?
My customers depend on me to keep their vehicles on the road. I depend on Sonnax to help me do that. Thanks Sonnax!
S. Moore, Moore's Transmission
Latest News
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.
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!
Find a Sonnax Distributor Faster & Easier than Ever
The ‘Find a Distributor’ web page has a fresh new look! And it’s now faster and easier than ever to find the Sonnax parts you need:
- Powerful distributor locator helps you find the locations nearest you
- Google Maps included with search results make it easy to spot locations
- Distributor branch locations now included for a complete listing of available options
- Search for a distributor by location, name, or view the complete list
I am a Sonnax fan because no matter if I am rebuilding an everyday transmission or a race transmission, I can trust the quality of the Sonnax parts I choose.
C. Lentech, Lentech Automatics
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Sonnax tools save me time, money and come backs, I use them on every rebuild we do in my shop.
E. Sebris
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 SonnaxAll of Sonnax product lines are top notch. I use Sonnax on all my builds.
F. Lane, FastLane Racing Transmissions