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Sonnax

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

High Performance Gearhead
Trans Digest Top 10 Products

Popular Kits for Transmission Upgrades:

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

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

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Heavy Duty & High Performance Upgrades

Sonnax high performance transmission products meet the toughest challenges faced by hard-working, daily-use transmissions as well as racing units going all-out on the street or track. Products range from innovative upgrades designed to fix everyday problems rebuilders see in their shops to an extensive line of Powerglide® components. We also offer specialty parts for high performance torque converters.

Dodge-Cummins Diesel
Dodge-Cummins Diesel
4L60-E
4L60-E
Powerglide
Powerglide®

More Popular Performance Applications

Plow Truck Repairs & Upgrades

Once winter arrives and the snow starts piling up, valuable plow trucks will be burning through transmissions and winding up in the shop. These top Sonnax repairs and upgrades are ideal for getting those vehicles back on the road and going strong before the next storm hits.

Snow Plow
Part No. Part Name
Ford 5R110W
36885 Low/Reverse Retaining Ring
36940-17K Pressure Switch O-Ringed End Plug Kit
Ford E4OD/4R100
4R100-LB1 Line Pressure Booster Kit
SC-4R100HD Performance Pack
36424-04K Line-To-Lube Pressure Regulator Valve
36947-09K Heavy Duty Low/Reverse Modulator Sleeve Kit
36605-02K Cooler Bypass Valve Kit
36425-01K Front Lube/Drainback Valve Kit
36424-24K Intermediate & Direct Clutch Feed Seal Kit
Ford AODE, 4R70W
4R70W-LB1 Line Pressure Booster Kit
76948-16K Oversized Pressure Regulator & Boost Valve Kit, '91–'95
76948-17K Oversized Pressure Regulator & Boost Valve Kit, '96-Later
76507F-01K Valve Body Retainer Plate Kit
76833E Overdrive Servo Pin Kit
Chrysler 618/48RE
22771A-10K Lube Regulated Pressure Regulator Valve
22771-04K Oversized Throttle Valve Kit
22121B-01 Input Shaft
22301B-01K 2nd Gear Super Hold Servo Kit
22841-04K Accumulator Piston Kit
22912-01K Reverse Servo Piston Plug Kit
22912 Rear Servo Piston
22700GT-01 6-Tab Thrust Washer
Chrysler 68RFE/545RFE
72530B-02 Center Pump Gear
92835-18K Oversized Solenoid Switch Valve Plug Kit
44912-03K TC Limit Valve & Sleeve Kit
44892-01K Accumulator Cover Plate
Part No. Part Name
GM 400
400-LB1 Line Pressure Booster Kit
34322-01 Forward Clutch Hub
GM 4L80-E
4L80E-LB1 Line Pressure Booster Kit
34200-14K Lube Regulated Pressure Regulator Valve
34528-01K Reverse Servo Spacer Kit
34006-SP Bushing
34200-10K Boost Valve Kit
34200-16K Actuator Feed Limit Valve Kit
38511-01K Manual Shift Shaft Kit
GM 4L60-E
4L60E-LB1 Line Pressure Booster Kit, Early-Style
4L60E-LB2 Line Pressure Booster Kit, Late-Style
HP-4L60E-01 Performance Pack
77754-41 Heavy Duty 2-3 Shift Valve
77002BT-01 Bushing
77733-02K Input Drum Reinforcement Sleeve & Seal Kit
77749-02K SmartShell® Heavy Duty Reaction Shell Kit
77754-21 Forward & Reverse Abuse Bore Plug
74678S-HD Heavy Duty Output Shaft
GM 6L80/ 6L90
6L80-LB1 Line Pressure Booster Kit
6L45-6L90-ZIP Zip Kit®
New Process 230 & 240 Series
100420-02K Transfer Case Split Ring Retainer
100246-02K Transfer Case Pump Plate Kit
New Part

New Parts

4-5-6 Clutch Apply Piston Kit 4-5-6 Clutch Apply Piston Kit
104960-01K
HP Icon

GM 6L80 and 6L90 transmissions often suffer failure of the 4-5-6 clutch assembly due to OE design shortcomings. Insufficient clutch piston-to-plate apply surface area causes clutch plate failure...

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Ring Gear Anti-Wear Washer Kit Ring Gear Anti-Wear Washer Kit
28510-AW
HP Icon

Contact between the aluminum Powerglide ring gear and the Reverse clutch pack pressure plate causes damage to both components and generates metal debris that circulates throughout the transmissi...

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Smart-Tech® 10-Clutch Drum Kit Smart-Tech® 10-Clutch Drum Kit
28756-25K
HP Icon

Smart-Tech 10-clutch drum kit 28756-25K features Sonnax's oversized piston with 35% more apply area than OE drums or Sonnax regular 10-clutch drum kits. The 35% larger piston increases both the ...

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Powerglide® 1.65 Extreme Planetary Assembly Kit Powerglide® 1.65 Extreme Planetary Assembly Kit
28165G-06SP
HP Icon

Sonnax 1.65 ratio Extreme planetary assembly kit 28165G-06SP is based on the same innovative architecture of our 1.58 ratio assembly, but fitted with 1.80 style 12DP gears. This is the lowest nu...

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  • Flange Tooth Count: 24
  • Ratio: 1.65
  • Shaft Length Option: Short
  • Gear Process Level: Extreme
  • Material: 300M Rolled Spline Shaft Shaft
 
Powerglide® 1.65 Ratio Extreme Planetary Assembly Kit Powerglide® 1.65 Ratio Extreme Planetary Assembly Kit
28165G-06
HP Icon

Sonnax 1.65 ratio Extreme planetary assembly kit 28165G-06 is based off the innovative 1.58 ratio architecture fitted with 1.80 style 12DP gears. This is the lowest numerical ratio 12DP gear set...

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  • Flange Tooth Count: 24
  • Ratio: 1.65
  • Gear Process Level: Extreme
  • Shaft Length Option: OE
  • Material: 300M Rolled Spline Shaft
 
High-Strength Intermediate Stub Shaft High-Strength Intermediate Stub Shaft
76670A-01
HP Icon

Intermediate stub shaft failure is a common problem in Ford AODE, 4R70W/E and 4R75W/E units used in abusive applications or with increased power levels. Sonnax high-strength intermediate stub sh...

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2.84 Ratio Input Carrier Kit 2.84 Ratio Input Carrier Kit
77284-K
HP Icon

The steepest first gear ratio of any four-speed automatic (3.06) belongs to the GM 4L60/E family of transmissions. The shift from 3.06 ratio (first) to 1.63 ratio (second) is a dramatic ratio ch...

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Pump Slide Spring Pump Slide Spring
104534-HD
HP Icon

Sonnax high-performance pump slide spring 104534-HD for GM 6L80 and 6L90 transmissions helps maintain consistent pump volume during line rise and at high-RPM operation.

In high-performanc...

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