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
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New Parts

3rd & Reverse Checkball Sleeve 3rd & Reverse Checkball Sleeve
34200-38

Vehicles with GM 4L80-E and 4L85-E transmissions commonly exhibit wear in the 3rd and Reverse checkball sleeve located in the 3-4 shift valve bore. This issue is caused by normal movement of the...

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Thrust Washer Thrust Washer
77409-16

As various transmission components wear over time, front unit endplay can stray from specification. Replacement of assorted parts will similarly modify endplay settings. Sonnax selective thrust ...

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  • Inner Dia.: 1.240"
  • Outer Dia.: 1.815"
  • Thickness: 0.096"
  • Material: Steel
Front Stator Bushing Front Stator Bushing
95030-09

Front stator support bushings in ZF6HP19 and ZF6HP21 units have a tendency to wear out prematurely due to sub-optimal material composition of OE bushing. This wear can lead to bushing failure an...

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  • Housing Bore: 1.063"
  • Shaft Dia.: 0.952"
  • Width: 0.393"
  • Material: Bi-metal, aluminum alloy lining
  • Bushing Style: Precision
Reinforced Input Housing Kit with Heavy Duty Input Shaft Reinforced Input Housing Kit with Heavy Duty Input Shaft
77733-15K
Hp-logo

Sonnax reinforced OE input housing and heavy-duty input shaft kit 77733-15K is a great upgrade for 4L60-E, 4L65-E and 4L70-E high performance and heavy-duty applications. Shaft is made of specia...

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Reinforced Input Housing Kit with Heavy Duty Input Shaft Reinforced Input Housing Kit with Heavy Duty Input Shaft
77733-14K
Hp-logo

Sonnax reinforced OE input housing and heavy-duty input shaft kit 77733-14K is a great upgrade for GM 4L60-E, 4L65-E high performance and heavy-duty applications. The shaft is made of specially ...

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Isolator Valve Spring Isolator Valve Spring
124740-16

Ford 6F50, 6F55 and first-generation GM 6T70, 6T75 units may exhibit no line rise and/or line pressure instability due to a broken isolator valve spring. The isolator valve is in the main line p...

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Tool Kit Tool Kit
F-15741-TL55

Tool Kit for 15741-55K

Oversized C1/K1 Clutch Control Valve Kit Oversized C1/K1 Clutch Control Valve Kit
15741-55K

C1/K1 clutches in Aisin AW 6-speed units are applied in first through fourth gears in conjunction with other clutch packs. As the C1/K1 clutch control valve oscillates and strokes over time, bor...

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