Sonnax Kits

Which Sonnax Kit is Right for Your Rebuild?

Transtar Cleaning Products


Transtar Industries & Sonnax

Transtar's community of suppliers represents the most trusted and experienced in the industry. Sonnax shares our vision and meets the premium standards we set for all of our product offerings. We rely on the best aftermarket and OE suppliers in the industry. 



Sonnax Line Pressure Booster Kits:

Sonnax booster kit components are uniquely designed for precision pressure control. At low-end pressures, they deliver normal engagements, normal light throttle shifts and smooth coastdown shifts. When vehicles are pushed harder, components progressively increase pressure for improved clutch holding capacity and increased durability. (Learn More)



Sonnax Zip Kits®

It's easy to restore and extend vehicle shift quality with Zip Kits. Uniquely designed Sonnax parts target the root cause of valve body complaints and stop critical circuit pressure losses in the most common problem areas of the transmission. (Learn More)



The Sure Cure®

Knowing exactly what parts to replace in troublesome transmissions is an ever-increasing challenge, but Sonnax Sure Cure kits solve this problem for you. Each kit is a comprehensive reconditioning package featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance. (Learn More)



Sonnax Performance Packs

Performance enthusiasts look to Sonnax when building stronger, faster, more reliable transmissions. Performance Packs combine key Sonnax performance and heavy duty parts into powerhouse kits which take transmissions to the next level. (Learn More)



  • No, simple parts in the kits require NO special tools or reaming for installation, and will not permanently modify the valve body core,

  • Beginning March 1, 2019 Sonnax will stop inserting instructions into their 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 KitsĀ® and The Sure CureĀ® kits.

    Instructions for all products will remain available on the Sonnax website. To ensure everyone has quick access to those documents, Sonnax created a simple search tool found at