Sonnax is an 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. Sonnax, a Marmon/Berkshire Hathaway company, serves the aftermarket with both the Rostra Powertrain Controls and Sonnax brands.

What sets us apart from the competition is our passion for quality and innovation. This passion exhibits itself in our long-standing philosophy to address the root cause of a problem, and not just treat the symptoms. In striving to discover what causes common transmission and converter problems, we meld new ideas, materials and state-of-the-art testing to ensure our parts will restore OE performance, or make it better-than-new.

Sonnax Transmission Company headquarters is in Bellows Falls, VT, with production facilities in Laurinburg, N.C. and several technical development centers located across the country.


Sonnax

Heck yeah!! 💪 Big thanks to @FirepunkDiesel for the awesome shout out on our RFE heavy duty inner retainer housing kits. We greatly appreciate your support! 🙌💯

9 months ago (edited) | [YT] | 2

Sonnax

🚨 BUYERS BEWARE! Counterfeit parts are out there — and they can DESTROY your build.

A customer’s transmission burned up less than 1,000 miles after rebuild. To find answers, @nickstransmissions used the tried-and-true method of vacuum testing…and the culprit was revealed: a counterfeit Sonnax part.

🎥 Watch this video to see exactly how he caught it.

Huge thanks to Nick for sharing this discovery to help keep the industry safe from fakes! 🙌💯

NOTE: Always purchase Sonnax parts through authorized Sonnax distributors to ensure quality and authenticity: www.sonnax.com/distributors

9 months ago (edited) | [YT] | 3

Sonnax

Happy to see the ‪@PrecisionTransmission‬ team is back in the shop and doing what they love! They're kicking off with a badass 48RE build featuring many top-of-the-line #Sonnax parts. We greatly appreciate all their support and encourage you to check out their videos and hit that 'Subscribe' button - you can really learn a lot from these guys. :)

4 years ago | [YT] | 7