About Us

Founded in 1978, Sonnax is an award-winning industry leader in the cutting edge design, manufacture and distribution of the highest quality products to the automotive aftermarket, commercial vehicle industries, and industrial sectors utilizing drivetrain technology. We offer a wide variety of innovative components used to remanufacture torque converters, rebuild automatic transmissions, upgrade driveshafts and protect the driveline from over-torque damage.

As a leading supplier to the automotive aftermarket, Sonnax exports to more than 70 countries and supports emerging markets worldwide. An international network of distributors, remanufacturers and technical resources is one result of our commitment to successful partnerships with our customers. The Sonnax TASC Force is vital to this effort, bringing the Sonnax team together with transmission specialists, remanufacturers and rebuilders to share knowledge benefitting the entire transmission industry.

Recognized in 2012 and 2014 as one of the Best Places to Work in Vermont, Sonnax is one of the fastest growing companies in the state and we are proud to be a 100% employee-owned company. Sonnax corporate headquarters located in southern Vermont includes state-of-the-art design, inspection, technical development and distribution facilities, with additional Technical Development Centers located in California, Georgia, Missouri, New Jersey, Washington and Wisconsin. Our almost 250 employees take great pride in the Sonnax name, and strive to further the company’s reputation for excellent service, technical knowledge and customer dedication.

Sonnax Industries is an ISO 9001: 2008 Registered Company

Mission Statement

Sonnax’s mission is to be the leading supplier of innovative drivetrain components to the automotive aftermarket by developing quality solutions that serve customer needs. To achieve our mission we are focused on three broad strategies:

  • Identify, design and deliver the highest-quality products in a timely fashion
  • Provide excellent customer service through technical support, education and friendly customer response
  • Provide our employees with a rewarding career experience that is respectful and challenging
  • Sonnax Industries manufactures first-class products to go along with their excellent customer service."

    J. Paradise
    HL Performance Converters

  • TWO THUMBS UP. I am a firm 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

  • You can’t fix transmissions without Sonnax.”

    Lou Vari Transmission
    Youngstown, OH

  • We love your products. I used honda PR valve and end plug kits and they work wonderful, so now we use them with every rebuild.”

    K. Diap
    ANS Transmission
    Toronto, Ontario


  • Best Places to Work in Vermont 2012 & 2014
  • 31-time Winner of Transmission Digest Top 10 Products Award
  • 23-time Winner of Transmission Digest Top 10 Tools Award
  • 6-time Winner of Governor's Worksite Wellness Award
  • 3-time Winner of Jasper Supplier Service Award
  • ATRA/Gears Magazine Distinguished Supplier Award
  • TCRA Exporter of the Year Award
  • TCRA Appreciation Award
Top 10 award


Note: For GPS purposes, use 2 Imtec Lane as Sonnax street address.

From Boston & Points East

  • Route 2 West to Gardner, MA
  • Take Route 140 North to Route 12 North
  • Stay on Route 12 North through Keene, N.H.
  • Drive north toward Bellows Falls and cross the second bridge to Vermont
  • Turn right onto Route 5 North for about 3 miles
  • For the Sonnax Technical & Distribution Center, turn right onto Industrial Drive (just before the passing lane begins on Route 5)
  • For Sonnax Corporate Headquarters, stay on Route 5 for approximately 1/2-mile longer, then turn right onto Imtec Drive (just past the Shell Station). The Sonnax parking lot is on your immediate left.

From Albany & Points West

  • Get on Route 7 East to Vermont
  • Route 7 turns into Route 9 in Vermont
  • Drive Eastward on Route 9 to Brattleboro, and get on I-91 North
  • Get off at Exit 6
  • For Sonnax Corporate Headquarters, turn left at bottom of exit ramp, then take your first right onto Imtec Drive (just past the Shell Station). The Sonnax parking lot is on your immediate left.
  • For the Sonnax Technical & Distribution Center, turn right at the bottom of the exit ramp, proceed about a 1/2-mile south on Route 5, then turn left onto Industrial Drive

From Points North

  • Take I-91 South to Exit 6
  • Turn right onto Route 5 South
  • For Sonnax Corporate Headquarters, drive approximately 2/10 of a mile; it is the first building on the left
  • For the Sonnax Technical & Distribution Center, proceed about 1/2 mile further south on Route 5, past the Corporate Headquarters, then turn left onto Industrial Drive

From Points South

  • Take I-91 North to Exit 6
  • For Sonnax Corporate Headquarters, turn left at bottom of exit ramp, then take your first right onto Imtec Drive (just past the Shell Station). The Sonnax parking lot is on your immediate left
  • For the Sonnax Technical & Distribution Center, turn right at the bottom of the exit ramp, proceed about a 1/2-mile south on Route 5, then turn left onto Industrial Drive

Employee Stock Ownership Plan (ESOP)

Sonnax is proud to be 100% Employee-Owned!

In 2010, Sonnax announced the formation of an Employee Stock Ownership Plan (ESOP). The ESOP is the ultimate way to reward our employees for their hard work and contributions to the company.

An ESOP is an employee benefit plan that invests primarily in stock of the sponsoring company. The company sets up a trust fund which owns shares of the company stock. At Sonnax, the trust owns 100% of the company stock. Shares in the trust are allocated to individual employee accounts. As employees accumulate seniority within the company, they acquire increased vesting in those shares.

The ESOP helps to provide stable careers and local ownership. It enables a motivating atmosphere where employees can feel good about coming to work every day. And the greatest benefit of the ESOP is that it allows employees to participate in the growth and success of the business.

Of course, being 100% employee-owned is just one of the many wonderful reasons that Sonnax was named one of the best places to work in Vermont. Check out our Career Opportunities page for current openings.

Sonnax Employee-Owners

TASC Force

True collaboration toward a common goal is not something you see everyday, but that is what the Sonnax TASC Force is all about.

TASC Force Logo

The Sonnax Technical Automotive Specialties Committee (TASC) Force is composed of experienced transmission rebuilders and technicians who value technical innovations and have hands-on understanding of the latest units and industry developments. From around the globe, the best minds in the transmission industry willingly share their know-how, with the understanding that everyone benefits when good ideas and products emerge from centuries of combined transmission wisdom.

Independent TASC members work for large shops, small shops, volume transmission and volume valve body rebuilders. Alongside Sonnax engineers and specialists, they are helping to develop repairs which will be used by their companies and by the rest of the transmission aftermarket.

TASC Force members contribute product ideas, test new products, troubleshoot results, and get together on a regular basis to listen, discuss and compare findings. Their efforts help provide answers and repairs for the entire industry. Everybody wins.

What people are saying about why the TASC Force is so important to this industry:

The TASC Force has been very helpful in addressing the needs and problems of the European, and especially the U.S. market.Adrian Marty, Automaten-Meyer AG
Sonnax and the TASC Force have invested thousands of hours in testing. The results of these efforts allow the transmission industry to produce a quality product at a competitive price.Dale Desveaux, Dale's Transmission, Ont., Canada
The TASC Force is another example of what happens when people in this industry get together to address common issues. The people I've met on the TASC Force are some of the sharpest in the industry and the work they do helps the entire industry. Keep it up.Dennis Madden, CEO ATRA/Gears
We have always looked at what causes failures, as well as what actually failed. This is the only true way of doing a great job for our customers. By becoming involved with the TASC Force, and using Sonnax products religiously, we are better able to do just that.Scott Medori, Parkland Transmission, Red Deer, Alberta, Canada
Transmission Digest continues to depend on the TASC Force for answers and explanations our readers need to address everyday rebuilding issues and seldom encountered pitfalls in their shop operations. Our TASC Force Tips column is highly regarded by an avid and interested readership.Bobby Mace, Publisher, Transmission Digest

TASC Force Meetings

Click on the list below to read about recent TASC Force Meetings.

General Warranty Policy

Sonnax warrants to the purchaser that each part manufactured or supplied by Sonnax will be free from defects in material or in factory workmanship. The warranty period shall extend for six (6) months from the date of sale. Sonnax must receive all warranty claims before the end of the warranty period.

If Sonnax determines that the part is defective in material or in factory workmanship, Sonnax will, at its option, repair or replace the defective part, or issue an account credit for the purchase price. This remedy is Sonnax's sole liability and the sole remedy provided by Sonnax for any breach of warranty.

All warranty returns must be pre-approved. Please contact Sonnax if you have a part to be returned under this warranty.

This warranty will not cover: Removal and replacement labor costs; Loss of time, inconvenience or other consequential damage; Any Sonnax part that has been: Subject to misuse, negligence; alteration or improper maintenance; Improperly installed in the judgment of Sonnax, so as to adversely affect its performance and reliability.

This warranty is the only warranty applicable to parts manufactured or supplied by Sonnax, and is expressly in lieu of any other warranties, expressed or implied, including any implied warranty of merchantability or fitness for a particular purpose. Any representations or descriptions in brochures, ads or catalogs are approximate only and will not create any warranty or other obligation by Sonnax. There are no warranties which extend beyond the description on the face hereof.

Sonnax does not authorize any person to create for it any other obligation or liability in connection with these parts. Sonnax shall not be liable for any incidental or consequential damage, lost profits, lost savings or punitive damages resulting from any breach of warranty.

Remanufactured Valve Body Limited Lifetime Warranty

All Sonnax remanufactured valve bodies are backed by a limited lifetime warranty. During the first year, defective valve bodies will be replaced, free of charge. After the first year, valve bodies may be returned for repair or replacement, with the only cost to the customer being shipping charges.

Warranty claims must be directed to Sonnax at 1-866-243-8829 before any attempt is made to return a valve body. Failure to call before returning may result in a restocking fee.

Any unauthorized repairs, alterations, misuse or disassembly will void the warranty. Proof of purchase may be required.


Installation of a Sonnax valve body for diagnostic purposes will void the warranty; valve bodies subjected to such misuse and returned under warranty will receive core credit only.

Terms & Conditions

This website and all of its contents are the intellectual property of Sonnax Industries, Inc. No portion of this work may be reproduced or transmitted in any form or by any means, mechanical or electronic, including photocopying and/or recording, or by any other information storage and/or retrieval system without the prior written consent of Sonnax Industries, Inc. Sonnax customers may use the part numbers only for the limited purpose of placing orders with Sonnax or otherwise operating their business, but in no case is permission granted to any customer, business entity, or individual to utilize the part numbers in order to compete with Sonnax.

While every care has been taken in the compilation of information and materials on this website, we cannot guarantee that inaccuracies will not occur or that this information will remain accurate over time. The information and materials on this website are provided “as is” and without warranties or conditions of any kind either expressed or implied.

Career Opportunities

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

Recognized in 2012 and 2014 as one of the Best Places to Work in Vermont, 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 and we are proud to be 100% employee-owned. 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.

Sonnax Employee-Owners

Current Openings

With Sonnax you will enjoy outstanding benefits including:

  • Medical/dental/vision insurance
  • Group life/supplemental insurance
  • Employee stock ownership plan (ESOP)
  • 401(k) retirement savings plan
  • Paid holidays/vacation/personal days
  • Wellness program
  • In-house gym
  • Tuition reimbursement and more!

If you are interested in a career with Sonnax, please send your resume and cover letter to:

Sonnax Industries, Inc.
Attn: Human Resources
1 Automatic Drive
P.0. Box 440
Bellows Falls, VT 05101-0440, USA

Fax: (802) 428-1830
Email: opportunities@sonnax.com