Ts robothead 18in high trans rgb
Maybe it’s not the torque converter!

View Transmission Parts for Resolving & Preventing Torque Converter Problems

Quality solutions for every transmission job.

Whether you want to rebuild it yourself or save time and money with a fully remanufactured valve body, Sonnax has you covered.

Sonnax transmission products are the number one choice of large transmission remanufacturers, quality valve body rebuilders, and veteran independent specialists around the world. With the 2014 acquisition of Valve Body Xpress (VBX), the transmission aftermarket now has one trusted source of quality solutions for every transmission job.

Valve Body Layouts Valve Body Layouts
Vacuum Testing Vacuum Testing
Sonnax Smart-Tech® Forward Clutch Drum Sonnax Smart-Tech® Forward Clutch Drum

Which Sonnax Kit is Right for Your Rebuild?

Line Pressure Booster Kit

Line Pressure Booster Kits
Affordable kit for big performance without a big price tag.

Zip Kits®

Zip Kits®
The first step in correcting common shift problems.

The Sure Cure®

The Sure Cure®
Comprehensive kit for big problems you don't want back.

Performance Packs

Performance Packs
The best parts for performance & heavy duty recalibration.

View NEW Transmission Parts View All Transmission Parts