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
Enter a Sonnax part number below to view its instructions. For general reaming instructions, click here.
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
Uniquely designed to fit all '99-later Chrysler 45/545/65/66/68RFE applications – regardless of OE checkball or solenoid configuration.
Get the best protection against breakage and salvage damaged drums with these simple, affordable kits.
Get an optimal balance of increased clutch capacity, improved thermal mass and stiffer apply and backing plates.
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
Need or prefer a drop-in repair for common shift problems?
Introducing Zip Valve™ products – a new brand covering the hundreds of drop-in valves and Zip Kits rebuilders have trusted for years to overcome chronic transmission problems. These easy-to-install components deliver quality and performance that can’t be beat thanks to upgraded Sonnax design features, improved materials and precision manufacturing.
More than 350 different products covering 200-plus transmissions are available, and it’s easy to identify these parts anywhere on the Sonnax website by the new, drop-in “ZIP” logo that accompanies each one. Just like you can narrow down search results by unit or part type, choosing to display only Zip Valves is now another option for quickly finding just the right repair.
“At Sonnax, we strive to have the best selection of highest-quality solutions available for our customers.” says Sonnax President Steve Boyer. “When you’ve got a build on your bench, it’s our job to provide you with a wide range of options you can trust.”
Find the right Zip Valve products for your next build here: https://www.sonnax.com/zip_valve
Made from highly wear-resistant material to provide the ultimate in durability, these new, drop-in valves correct critical pressure loss that leads to shift complaints, codes, and apply component failure. Unique features like added seals, sleeves and modified spool designs overcome chronic hydraulic problems for a result you can trust. Click the links below to learn more!
Chrysler 845RE, ZF8HP45/55/70
Ford 4R70E/W, 4R75E/W, AODE
Ford 6F35 (Gen. 1 & 2)
Ford 6F50/55, GM 6T70/75 (Gen. 1 & 2), 6T80 (Gen. 2)
Ford 6F50/55, GM 6T70/75 (Gen. 1)
GM 6T30/40/45/50 (Gen. 1 & 2), 6T31/35/41/46/51, 6T40 (Gen. 3)
GM 6T70/75/80 (Gen. 2)
It is our sincere hope that you and your families remain safe and in good health. The unprecedented humanitarian and economic crisis we find ourselves in is like nothing we could have ever imagined.
At Sonnax, it is our goal to serve you in these uncertain times in a safe and responsible manner. We are working every day with our supplier and distributor partners to continue providing the parts and product support you need.
Safety has and continues to be our first priority, and we have instituted additional hygiene protocols and safety measures to keep our employees as safe as possible. Our IT infrastructure has been optimized to enable employees to work from home when possible, while minimizing impact on operations and production.
Additionally, we have decided to temporarily suspend operations in our facilities on April 13, 24 and 27.
We remain committed to the idea that this crisis will be temporary, and that we will need full capacity to meet customer needs as the market recovers. As we continue to navigate our way through this crisis, we are grateful for your support and partnership in the market we serve.
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
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
All of Sonnax product lines are top notch. I use Sonnax on all my builds.
F. Lane, FastLane Racing Transmissions