No one knows transmissions & torque converters like

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

New Part

New Parts

Ring Gear Anti-Wear Washer Kit Ring Gear Anti-Wear Washer Kit
28510-AW
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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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Powerglide® 1.65 Extreme Planetary Assembly Kit Powerglide® 1.65 Extreme Planetary Assembly Kit
28165G-06SP
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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
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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
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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
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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
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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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Multi-Plate Converter Clutch Kit Multi-Plate Converter Clutch Kit
FD-RK-16
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Trucks with Ford 6.4 liter diesel engines are commonly pushed beyond the limits for which they were designed. To upgrade the torque converter, Sonnax offers two heavy-duty multi-plate converter ...

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Multi-Plate Converter Clutch Kit Multi-Plate Converter Clutch Kit
FD-RK-15
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Trucks with Ford 6.4 liter diesel engines are commonly pushed beyond the limits for which they were designed. To upgrade the torque converter, Sonnax offers two heavy-duty multi-plate converter ...

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