Latest News

February 18, 2019

Important Change Coming to Sonnax Packaging

As part of an initiative to Go Green in ’19, Sonnax will cease including printed instructions with most products.

Beginning March 1, we will stop inserting instructions into the packaging of approximately 1,000 products. This change will primarily impact parts such as end plugs, valve kits and bushings that come in small bags. In general, instructions will continue to ship with larger components and boxed products such as Zip Kits® and The Sure Cure® kits.

Instructions for all products will remain available on the Sonnax website – and are now faster and easier to find.

Why is Sonnax doing this?

Reduce Waste: We printed more than 1 million pages of instructions last year— that’s a LOT of trees. 

Make the Sonnax Workplace Safer: The rising number of pages has been matched by more repetitive motion concerns and injuries among Sonnax employees packaging our smallest, bagged parts. Products packaged this way are also among the easiest to install. Instructions are often thrown away, unused.

To ensure everyone has quick access to all instructions, we created a simple online search tool: 

1. Quickly view instructions at

2. In the search box, enter the Sonnax part number found on the Sonnax packaging. 

If instructions are available, a PDF will open or your browser will download the file (your own browser settings control what happens). If no instructions are found, verify you are typing the correct part number or visit the part page on the website for product information.


Read More
January 23, 2019 Fb ad   plow truck repairs   upgrades

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 Fb holiday giveaway 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
October 24, 2018 Phil scott at sonnax  51

Governor Meets with New Ownership at Sonnax

Sonnax President Steve Boyer met with Governor Scott and Brattleboro Development Credit Corporation Executive Director Adam Grinold on Tuesday as part of Windham County Capitol for a Day.

“We were honored to welcome Gov. Scott to Sonnax and eager to show him the high-quality products and operations made possible by the entire Sonnax team,” said Sonnax President Steve Boyer. “We are pleased to work with government and business development leaders for the continued growth of our state, regional, and local economies.”

“Our Capitol for a Day initiative is about getting outside Montpelier, so we can listen to and learn from Vermonters around the entire state, and better understand their unique challenges and opportunities,” said Governor Scott. “And as my Administration makes expanding and strengthening Vermont’s workforce a top priority, it was incredibly valuable to hear from BDCC and Sonnax leadership about the workforce needs in the region, and the regional efforts to recruit and train Vermonters for the good jobs available today.”

About Capitol for a Day:
The Governor, along with members of his cabinet and extended cabinet, spend the day in every county, meeting with area constituents, lawmakers, local partners and state employees throughout the day.

The initiative aims to give regional constituencies direct access to Administration leadership, as well as giving Administration officials an opportunity to visit regional businesses, schools, community organizations and municipal offices. The Administration expects to visit each of the state’s 14 counties throughout the summer and fall of 2018.

Read More
September 26, 2018 Sonnax hp 4l60e catalog v4

New 4L60/E Catalog Available Now

Get your free copy of the new GM 4L60/E catalog now! It's jam-packed with:

  • Can’t-miss, performance upgrades for street enthusiast to extreme racing builds
  • Handy build charts for three levels of performance applications – plus HD pickups
  • Tips on how to build the ‘killer’ 4L60/E

If you think that 4L60/E on your bench can’t be faster, tougher, stronger – think again. Thanks to groundbreaking Sonnax upgrades, performance specialists are bringing this veteran tranny roaring back to life with jaw-dropping performance and reliability unimaginable even a decade ago.

Get your free copy here >>


Read More
August 31, 2018 Labor day 2018 v2

Sonnax Closed on Labor Day

Sonnax will be closed on Monday, September 3, in honor of Labor Day. Wishing you a safe and happy holiday weekend!

July 12, 2018 Job fair   july 24  2018 v2

Sonnax Job Fair - July 24

Take the first step toward starting your new career at our upcoming job fair! We are currently hiring for permanent, full-time positions as:

  • Product Support Reps
  • Warehouse Workers
  • Packagers
  • CNC Machine Operators
  • Machine Operators
  • Buyers
  • Packaging Inspectors, and more!


  • Medical/dental/vision insurance
  • Group life/supplemental insurance
  • 401(k) retirement savings plan
  • Paid holidays (10)
  • Vacation and sick pay
  • In-house gym
  • Employee discount program
  • Tuition reimbursement, and more!


  • 18 years of age or older.
  • Must have High School Diploma.
  • Must be authorized to work in the U.S.
  • Physical demands including lifting, pushing, and pulling up to 50 lbs.
  • Prior industry experience is preferred.
  • Background check and drug screen are required for employment.

Register to Attend Today!

We are an Equal Opportunity Employer

Read More
July 03, 2018 Fourth

Sonnax Closed for 4th of July

In honor of Independence Day, Sonnax will be closed Wednesday, July 4. Normal business hours will resume Thursday, July 5. Wishing you a safe and happy holiday!

May 29, 2018 Tasc force meeting may 2018

Sonnax Hosts Annual TASC Force Meeting

The Sonnax TASC Force recently got together for its annual meeting to discuss new product needs for the market. The meeting was held May 18-19 at the Sonnax New Jersey facility and the Warwick Rittenhouse Square Hotel in Philadelphia, PA. In attendance were 29 TASC members, representing 17 shops from six different countries.  

The meeting kicked off with a tour of Sonnax following a briefing by plant manager Mark Spaseff and remanufactured valve body product line manager Maura Stafford.  The tour focused on six major stations in the plant: receiving, core prep, reaming, building, testing and shipping. The re-occurring topic heard at all stations was the Sonnax commitment to safety, quality, delivery and continuous improvement. “We have been working hard to improve our products and service and are very excited to share our process improvements with the TASC Force,” said Spaseff.

After the tour, the group returned to the hotel where they were welcomed by Sonnax Transmission Company president Steve Boyer.  Boyer thanked everyone for attending the meeting and expressed his excitement to be there as he’s heard so much about what TASC means to Sonnax, and how it affects the new product development needs of the industry.

Meeting topics included new product suggestions, Sonnax quality, and industry trends that the automatic transmission aftermarket is facing today.  

Former President & CEO Tommy Harmon
Former President & CEO
Tommy Harmon

This year, more than 90 new product ideas were submitted, of which the group then votes on based on their importance to rebuilding today’s transmissions. Sonnax Vice President of product line management Steve Jaussaud noted the progress that his team has made; nine out of the 15 TASC picks from previous meetings are now available from Sonnax, and the other six are currently in development for future release.

A highlight of the TASC meeting is always the Friday night dinner where members have the opportunity to get together to discuss business and reminisce about meetings past. This year was especially notable when Steve Boyer presented former president and CEO Tommy Harmon with a framed Sonnax license plate from the traveling tech van. Boyer thanked Tommy for his vision and dedication to the TASC Force, and committed to keeping the mission alive in the future.

Read More
Read News Archive

Upcoming Events

ATSG Technical Seminar

March 23, 2019

400 Caddo St., Shreveport, LA

Learn More

ATSG Technical Seminar

March 30, 2019

21850 Oxnard St., Woodland Hills, CA

Learn More

ATRA Technical Seminar

April 13, 2019

2020 E American Blvd., Bloomington, MN

Learn More

ATSG Technical Seminar

April 13, 2019

10220 Regency Circle, Omaha, NE

Learn More

ATRA Technical Seminar

April 27, 2019

45 John Glenn Dr., Concord, CA

Learn More
See All Events