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
34200 40k web

4L80-E, 4L85-E

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

Fits units '97-later.

76654 01k

4R70E, 4R70W, 4R75E, 4R75W, AODE

Smart-Tech® Forward Clutch Drum 76654-01K

Compatible with ISS-equipped and non ISS-equipped applications

Fd 90 140g


Impeller Hub FD-90-140G

Gm b 8

6T40/6T45, 236mm

Bushing GM-B-8

For use with bushing style impeller hubs only.

Ch ws 27


Stator Cap CH-WS-27

Latest News

September 26, 2018

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 >>


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August 31, 2018

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

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

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Upcoming Events

ATSG Technical Seminar

10220 Regency Circle, Omaha, NE

October 27, 2018, 9:00AM - 4:00PM

Learn More

SEMA Show 2018

Las Vegas, NV

October 30, 2018, 9:00AM - 4:00PM

Learn More

ATRA Powertrain Expo

Las Vegas, NV

November 01, 2018, 7:00AM - 5:00PM

Learn More
See All Events

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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