No one knows transmissions & torque converters like

Sonnax

No one knows transmissions & torque converters like 2008-sonnax-logo-white

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

View Transmission Parts for Resolving & Preventing Torque Converter Problems

Nobody knows transmissions like Sonnax.

Sonnax transmission products are the number one choice of large transmission remanufacturers, quality valve body rebuilders, and veteran independent specialists around the world. Our innovative parts are designed to address the root cause of automatic transmission problems, allowing rebuilders to salvage valve bodies with highly effective repairs.

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.

  • Affordable kit with no special tools or reaming required
  • Slightly stronger springs for a modest base line pressure increase
  • Larger boost valves for demand-based line rise without low-speed harshness
3d zip kit-box_2010-right-trans Zip Kits®

The first step in correcting common shift problems.

  • Installs quickly & easily without any special tools
  • Stops leaks so the valve body works the way it's supposed to
  • In-depth tech booklet for installation, plus diagnostics & repair
Line Pressure Booster Kit The Sure Cure®

Comprehensive kit for big problems you don't want back.

  • Restores OE shift quality
  • Repairs biggest trouble areas to reduce comebacks
  • Step-by-step instructions for comprehenseive valve/pump body restoration
Performance pack box 3-d right flat trans Performance Packs

The best parts for performance & heavy duty recalibration

  • Firmer shifts under load without low-speed harshness
  • Consistent recalibration results with tuning options
  • Improved durability
  • No special tools required
New-part-logo

New Parts

Internal O-Ringed End Plug Kit Internal O-Ringed End Plug Kit
126740-05K

OE end plugs are designed to prevent critical pressure loss by capping the bore, while also functioning as a spring or valve stop. Repetitive spring motion, valve impact and fluid pressure varia...

Read More

Tool Kit Tool Kit
F-124740-TL14

Tool Kit for 124740-14K

Tool Kit Tool Kit
F-124740-TL26

Tool Kit for 124740-26K.

Oversized 3-5-R Clutch Regulator Valve Kit Oversized 3-5-R Clutch Regulator Valve Kit
124740-26K

3-5-R clutches in Ford 6F50, 6F55 and GM first generation 6T70 and 6T75 units are applied in third, fifth and Reverse gears in conjunction with other clutch packs. As the 3-5-R clutch regulator ...

Read More

Oversized TCC Control Valve Kit Oversized TCC Control Valve Kit
124740-14K

Common problems associated with Ford 6F50, 6F55 and first generation GM 6T70 and 6T75 units are high TCC slip, TCC lining degradation, TCC slip codes, and converter apply or release concerns. In...

Read More

Tool Kit Tool Kit
F-124740-TL21

Tool Kit for 124740-21K

Oversized 3-5-R Clutch Regulator Valve Kit Oversized 3-5-R Clutch Regulator Valve Kit
124740-21K

3-5-R clutches in Ford 6F50, 6F55 and GM first generation 6T70 and 6T75 units are applied in third, fifth and Reverse gears in conjunction with other clutch packs. As the 3-5-R clutch regulator ...

Read More

Took Kit Took Kit
F-102741-TL11

Tool Kit for 102741-11K

View more new Transmission parts View all Transmission parts