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.

Featured Products Where to Buy

View Sonnax Part Instructions

Enter a Sonnax part number below to view its instructions. Learn about reaming.

34200 40k web

4L80-E, 4L85-E

Smart-Tech® Overrun Clutch Valve Kit 34200-40K

Fits units '97-later.

T3 3 6081h

Roller Bearing Slip Yoke T3-3-6081H

Fits Powerglide, 350 and 350C. Also fits Saginaw 3- and 4-Speed, Muncie M20, M21 and M22 with 27-tooth spline. For use with roller bearing tail housing.

6l45 6l90 zip

6L45, 6L50, 6L80, 6L90

Zip Kit® 6L45-6L90-ZIP

Gm 90 83g


Impeller Hub GM-90-83G

Latest News

January 23, 2019

Top Plow Truck Drivetrain Repairs & Upgrades

HEAVY SNOW. SUB-ZERO TEMPS. BLACK ICE. These are a few of old man winter’s favorite tricks…and they can lead to treacherous driving conditions. Working hard to keep roads safe, plow trucks often burn through transmissions, torque converters and driveshaft assemblies, and end up in the shop.

Check out these top-quality repairs and upgrades to get them back on the road and going strong before the next storm hits:

Read More
December 13, 2018

Sonnax Holiday Hours

From all of us at Sonnax, thank you for another amazing year! We truly appreciate your support, and look forward to working together again in 2019. 

Holiday Hours:

    Dec. 24: Closed
    Dec. 25: Closed
    Dec. 31: Closed
    Jan. 1: Closed

Happy holidays and best wishes for the New Year!

December 03, 2018

Holiday Giveaway – Enter Now Through Dec. 31

We're giving away a $100 Visa gift card and prize pack full of cool Sonnax swag to three lucky fans!

Here's how to enter:
You can either enter on our Facebook page, or you can send an email to telling us which Sonnax product you like best and why. It’s that easy!

You have until 11:59 p.m. on Dec. 31 to submit your entry. Three lucky winners will be chosen at random and announced on Friday, Jan. 4. 

Good luck and Happy Holidays from all your friends at Sonnax!

Read More
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Upcoming Events

ATSG Technical Seminar

500 Stevens Dr., Philadelphia, PA

February 23, 2019, 9:00AM - 4:00PM

Learn More

ATRA Technical Seminar

55 Ariadne Rd., Dedham, MA

March 02, 2019, 8:00AM - 4:00PM

Learn More

ATSG Technical Seminar

Louisville, KY

March 02, 2019, 9:00AM - 4:00PM

Learn More
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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