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 Parts

O-Ringed End Plug Kit O-Ringed End Plug Kit
126740-09K

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...

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Shift Pressure Control Plunger Valve Kit Shift Pressure Control Plunger Valve Kit
59947-75K

The shift pressure control plunger valve in Aisin AW 55-50SN and 55-51SN units utilizes shift control solenoid fluid pressure (SLS) to regulate the inboard shift pressure control valve. This con...

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4-5-6 Clutch Backing Plate 4-5-6 Clutch Backing Plate
104140A-01

GM 6L80 and 6L90 transmissions often suffer failure of the 4-5-6 clutch assembly due to flexing and bowing of the backing plate (coning), especially when clutch apply pressures exceed OE specifi...

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  • Material: Steel
O-Ringed End Plug Kit
19741-13K

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...

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Accumulator Control Plunger Valve Kit Accumulator Control Plunger Valve Kit
19741-05K

Shift concerns in Aisin AW 60-40LE and 60-41SN transmissions can often be traced to wear at the accumulator control plunger valve sleeve. Wear occurs due to continuous movement of the steel valv...

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B1 Modulator Plunger Valve Kit B1 Modulator Plunger Valve Kit
19741-03K

The B1 brake in Aisin AW 60-40LE and 60-41SN transmissions is applied in 2nd and 4th gear. The B1 apply control plunger valve helps to correctly position the apply control valve to allow oil to ...

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O-Ringed End Plug Kit O-Ringed End Plug Kit
19741-15K

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...

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C1 Damper Piston Kit C1 Damper Piston Kit
19741-17K

Delayed/Harsh Forward engagement and a burnt C1 clutch in Aisin AW 60-41SN transmissions can often be caused by excess wear at the C1 damper piston bore. Because the piston acts as an accumulato...

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