Sonnax Performance Transmission Parts

Sonnax
  • Sonnax® - High Performance Automatic Transmission Line Pressure Booster Kit
    Sonnax®High Performance Automatic Transmission Line Pressure Booster Kit (4R100-LB1)
    0
    # mpn4658791175
    High Performance Automatic Transmission Line Pressure Booster Kit by Sonnax®. Includes: Pressure Regulator Spring, O-Rings (2), Large Ratio Boost Assembly. Sonnax hydraulic line pressure booster kits contain stronger pressure regulator...
    Achieve shorter shifts and increased torque capacity without creating low-speed harshnessImproved band and clutch holding capacity for increased durability
    $33.32
  • Sonnax® - High Performance Automatic Transmission Line Pressure Booster Kit
    Sonnax®High Performance Automatic Transmission Line Pressure Booster Kit (6L80-LB1)
    1
    # mpn4658791169
    High Performance Automatic Transmission Line Pressure Booster Kit (6L80-LB1) by Sonnax®. Includes: Pressure Regulator Spring, Large Ratio Boost Assembly. Sonnax hydraulic line pressure booster kits contain stronger pressure regulator...
    Achieve shorter shifts and increased torque capacity without creating low-speed harshnessImproved band and clutch holding capacity for increased durability
    $38.45
  • Sonnax® - High Performance Automatic Transmission Line Pressure Booster Kit
    Sonnax®High Performance Automatic Transmission Line Pressure Booster Kit (RFE-LB1)
    0
    # mpn4658791167
    High Performance Automatic Transmission Line Pressure Booster Kit (RFE-LB1) by Sonnax®. Includes: Pressure Regulator Spring, Wiring Harness with Connectors. Sonnax line pressure booster kit is an improved design over a simple resistor...
    Achieve shorter shifts and increased torque capacity without creating low-speed harshnessImproved clutch holding capacity for increased durability
    $75.55
  • Sonnax® - High Performance Automatic Transmission Line Pressure Booster Kit
    Sonnax®High Performance Automatic Transmission Line Pressure Booster Kit (A750-LB1)
    0
    # mpn4658791164
    High Performance Automatic Transmission Line Pressure Booster Kit (A750-LB1) by Sonnax®. Includes: Large Ratio Boost Assembly, Pressure Regulator Spring. Sonnax hydraulic line pressure booster kits contain stronger pressure regulator...
    Achieve shorter shifts and increased torque capacity without creating low-speed harshnessImproved band and clutch holding capacity for increased durability
    $92.98
  • Sonnax® - High Performance Automatic Transmission Pressure Regulator Spring
    Sonnax®High Performance Automatic Transmission Pressure Regulator Spring (77917-10)
    0
    # mpn4658791166
    High Performance Automatic Transmission Pressure Regulator Spring (77917-10) by Sonnax®. This high-quality, heavy-duty pressure regulator valve spring from Sonnax fits OE transmissions. The spring increases line pressure by...
    Increases line pressure by approximately 13%Produces firmer engagements/upshifts without creating harshness or clunky downshifts
    $8.44
  • Sonnax® - High Performance Automatic Transmission Servo Kit
    Sonnax®High Performance Automatic Transmission Servo Kit (28821-20K)
    0
    # mpn4658791241
    High Performance Automatic Transmission Servo Kit by Sonnax®. Includes: Supported Servo Cover, Supported Servo Pin, Servo Piston, Return Spring, Retaining Clip, Gasket, Cover O-Ring, Pin O-Rings (2) 1 extra, Drain Plug Not shown, Bolts...
    Unique cover and pin combination eliminates piston binding that causes unexplained band failureRace-calibrated spring counteracts pin bias effect up to 275 psi
    $139.72
  • Sonnax® - High Performance Automatic Transmission Servo Kit
    Sonnax®High Performance Automatic Transmission Servo Kit (K13259C-1)
    0
    # mpn4658791223
    High Performance Automatic Transmission Servo Kit (K13259C-1) by Sonnax®. C Ratio. Includes: Piston, Cover, Gasket, Retaining Ring, Spring, Lip Seal Large, Servo Pin with Seal Grooves, Lip Seal Small, PTFE Seals (2). Servo Cover Finish:...
    Purple cover machined from 6061 aluminum billetFirmer shifts
    $222.44
  • Sonnax® - High Performance Automatic Transmission Servo Kit
    Sonnax®High Performance Automatic Transmission Servo Kit (77701-04K)
    0
    # mpn4658791210
    High Performance Automatic Transmission Servo Kit by Sonnax®. 2nd Gear Corvette Ratio. Includes: Piston, Piston D-Rings (2), Housing, Housing O-Ring. Sonnax 2nd Gear "Corvette" ratio servo kit provides increased apply area resulting in...
    Upgrade used for high performance or heavy-duty towing applicationsImproved D-ring sealing configuration
    $59.81
  • Sonnax® - High Performance Automatic Transmission Servo Kit
    Sonnax®High Performance Automatic Transmission Servo Kit (K13259C)
    0
    # mpn4658791204
    High Performance Automatic Transmission Servo Kit (K13259C) by Sonnax®. C Ratio. Includes: Piston, Cover Purple Anodized, Pin with Seal Grooves, Gasket, Retaining Ring, Spring, PTFE Seals (2), Lip Seal Large, Lip Seal Small. Servo Cover...
    Purple cover machined from 6061 aluminum billetFirmer shifts
    $195.40
  • Sonnax® - High Performance Automatic Transmission Servo Kit
    Sonnax®High Performance Automatic Transmission Servo Kit (K36528R)
    0
    # mpn4658791187
    High Performance Automatic Transmission Servo Kit (K36528R) by Sonnax®. R Ratio. Includes: Cover, Assembly, Pin O-Ring, Pin PTFE Seal Ring, Medium O-Ring, Large O-rings (2), Cover Gasket, Selective Return Springs (2). Sonnax "R" ratio...
    Largest apply areaNo-leak servo pin design allows the servo piston to be used in worn bores
    $128.88
  • Sonnax® - High Performance Automatic Transmission Servo Return Spring Kit
    Sonnax®High Performance Automatic Transmission Servo Return Spring Kit (28133-HD)
    0
    # mpn4658791238
    High Performance Automatic Transmission Servo Return Spring Kit by Sonnax®. Race-Calibrated. Includes: Shims (2), Spring. Mystery band failures in OE transmissions are a common result of using inconsistent aftermarket servo return...
    Counteracts pin bias effect up to 275 psiIncludes two 0.050" shims to aid in tuning at higher line pressures
    $16.17
  • Sonnax® - High Performance Automatic Transmission Valve Body Recalibration Kit
    Sonnax®High Performance Automatic Transmission Valve Body Recalibration Kit (HP-4R100-01)
    0
    # mpn4658791245
    High Performance Automatic Transmission Valve Body Recalibration Kit by Sonnax®. Includes: 1-2, 2-3 and 3-4 Accumulator Control Valve Kits, Heavy Duty Low/Reverse Modulator Sleeve Kit, Line Pressure Booster Kit, Line-to-Lube Pressure...
    Recalibrated shift accumulation, with tunability for great HD shiftsImproved accumulator valves for greater clutch durability
    $218.22
  • Sonnax® - High Performance Automatic Transmission Valve Body Recalibration Kit
    Sonnax®High Performance Automatic Transmission Valve Body Recalibration Kit (HP-4L60E-01)
    0
    # mpn4658791197
    High Performance Automatic Transmission Valve Body Recalibration Kit (HP-4L60E-01) by Sonnax®. Includes: 1-2 Accumulator Valve Shim, TCC Pressure Limiter Valve and Spring Optional (eliminates PWM/EC3 function), Boost Valve with O-Ring...
    Consistent, firmer shifts under load without sacrificing low-speed drivability or guessing on calibrationFaster pressure increase and higher overall pressure for greater clutch/band holding power
    $187.15
  • Sonnax® - High Performance Extreme Heavy Duty Automatic Transmission Line Pressure Modulator Plunger Valve Kit
    Sonnax®High Performance Extreme Heavy Duty Automatic Transmission Line Pressure Modulator Plunger Valve Kit (96948-05K)
    0
    # mpn4658791163
    High Performance Extreme Heavy Duty Automatic Transmission Line Pressure Modulator Plunger Valve Kit by Sonnax®. Includes: Plunger Valve, Sleeve, O-Ring. Outer Diameter: 0.500". Some transmissions have soft 1-2 or 2-3 shifts,...
    Sleeve is manufactured from carbon steel to prevent excessive wearValve is made from hardened alloy steel for better wear resistance
    $29.64
  • Sonnax® - High Performance Heavy Duty Automatic Transmission Shift Valve
    Sonnax®High Performance Heavy Duty Automatic Transmission Shift Valve (77754-41)
    0
    # mpn4658791178
    High Performance Heavy Duty Automatic Transmission Shift Valve by Sonnax®. 2-3. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best automotive components...
    Improves input sprag and Forward clutch durabilityCritical upgrade for all heavy-duty and performance vehicles
    $37.13
  • Sonnax® - High Performance Smart Tech™ Automatic Transmission Servo Kit
    Sonnax®High Performance Smart Tech™ Automatic Transmission Servo Kit (28821-10K)
    0
    # mpn4658791229
    High Performance Smart Tech™ Automatic Transmission Servo Kit by Sonnax®. Ratio-Style. Includes: Servo Assembly, Cover Gasket, Case-to-Cover O-Ring, Servo Pin Seals (2) PTFE, 1 Extra, Primary Piston Seals (2) PTFE, Return Spring,...
    Designed to improve your vehicle’s performance for more enjoyable ridesManufactured from premium materials to offer a long-lasting service life
    $330.69
  • Sonnax® - High Performance Super Hold Automatic Transmission Dual Servo Kit
    Sonnax®High Performance Super Hold Automatic Transmission Dual Servo Kit (28821-09K)
    0
    # mpn4658791240
    High Performance Super Hold Automatic Transmission Dual Servo Kit by Sonnax®. Includes: Servo Assembly, Cover Gasket, Case-to-Cover O-Ring, Return Spring, Servo Pin Seals (2) PTFE, 1 extra, Primary Piston Seals (2) PTFE. Sonnax super...
    Dual piston design for 30% more apply areaSpring counteracts pin bias effect up to 275 psi
    $262.43
  • Sonnax® - High Performance Super Hold Automatic Transmission Servo Kit
    Sonnax®High Performance Super Hold Automatic Transmission Servo Kit (K65703)
    0
    # mpn4658791246
    High Performance Super Hold Automatic Transmission Servo Kit by Sonnax®. Includes: Piston, Pin, Shim, Spring, E-clip, Spacer, Cover Red Anodized, O-Ring Seal Small (not shown), O-Ring Seal Large, Lip Seals (2), Seal Rings (2). Sonnax...
    17% Greater apply area than Grand National servoExtra-long servo pin and optional parts for highly tunable shift feel
    $225.11
  • Sonnax® - High Performance Super Hold Automatic Transmission Servo Kit
    Sonnax®High Performance Super Hold Automatic Transmission Servo Kit (76890-17KP)
    1
    # mpn4658791244
    High Performance Super Hold Automatic Transmission Servo Kit by Sonnax®. Includes: Conical Washers (4), D-Ring Piston Seal, Spacer, Return Spring, Servo Pin, E-Clip, Servo Piston, Servo Cover, O-Rings (4), Washers (2), Gauge Tool. In...
    Largest apply area of any OE servoOptional cushion springs allow maximum holding power while reducing excessive harshness
    $140.16
  • Sonnax® - High Performance Super Hold Automatic Transmission Servo Kit
    Sonnax®High Performance Super Hold Automatic Transmission Servo Kit (22301B-01K)
    0
    # mpn4658791184
    High Performance Super Hold Automatic Transmission Servo Kit (22301B-01K) by Sonnax®. 2nd Gear. Includes: Cover, Piston, Sleeve, Pin, Retaining Ring, Seals/Seal Rings (5), O-Rings (3). Sonnax 2nd Gear super hold servo kit is the largest...
    Easy-to-install servo improves 1-2 & 2-3 shifts16% More apply area for more band holding power
    $98.12
  • Sonnax® - High Performance Super Hold Servo Kit
    Sonnax®High Performance Super Hold Servo Kit (77767K)
    0
    # mpn4658791209
    High Performance Super Hold Servo Kit (77767K) by Sonnax®. 4th Gear. Includes: Super Hold Servo Assembly, Steel Washer. Sonnax 4th Gear super hold dual servo kit features 40% more apply surface area for greater holding power. Vehicles...
    Patented dual-piston design with 40% more apply delivers greater holding powerD-ring seals prevent pressure loss
    $80.89
  • Sonnax® - High Performance Super Hold Servo Kit
    Sonnax®High Performance Super Hold Servo Kit (77911-03K)
    0
    # mpn4658791172
    High Performance Super Hold Servo Kit (77911-03K) by Sonnax®. 2nd Gear. Includes: 2nd Gear Piston, Separator, Apply Pin, D-Rings Small (2), D-Rings Large (2), O-Ring Small, O-Rings Large (2), PTFE Seals (2). Sonnax 2nd gear super hold...
    18% More apply area than OE servoMaximizes holding power in 2nd gear with more positive 1-2 and 2-3 shifts
    $122.52
  • Sonnax® - Remanufactured Valve Body
    Sonnax®Remanufactured Valve Body (GM036)
    0
    # mpn4774930077
    Remanufactured Valve Body (GM036) by Sonnax®. Without the Pump or Separator Plate. Molded lead frame harness. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the...
    One SKU fits all applications, saving time, money and confusionResurfaced OE channel casting eliminates warpage, burrs, and cross-leaks cost effectively
    $434.56
  • Sonnax® - Remanufactured Valve Body
    Sonnax®Remanufactured Valve Body (F091)
    0
    # mpn4732878292
    Remanufactured Valve Body by Sonnax®. Molded lead frame harness. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best automotive components from Sonnax....
    One SKU fits all applications, saving time, money and confusionResurfaced OE channel casting eliminates warpage, burrs, and cross-leaks cost effectively
    $172.73
  • Sonnax® - Remanufactured Valve Body
    Sonnax®Remanufactured Valve Body (BMW6L45E)
    0
    # mpn4732877519
    Remanufactured Valve Body (BMW6L45E) by Sonnax®. Molded lead frame harness. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best automotive components from...
    One SKU fits all applications, saving time, money and confusionResurfaced OE channel casting eliminates warpage, burrs, and cross-leaks cost effectively
    $343.05
  • Sonnax® - Remanufactured Valve Body
    Sonnax®Remanufactured Valve Body (CHR193)
    0
    # mpn4732877356
    Remanufactured Valve Body (CHR193) by Sonnax®. With Round Pin MLPS Switch. Molded lead frame harness. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best...
    One SKU fits all applications, saving time, money and confusionResurfaced OE channel casting eliminates warpage, burrs, and cross-leaks cost effectively
    $254.89
  • Sonnax® - Remanufactured Valve Body
    Sonnax®Remanufactured Valve Body (GM6T40-1)
    0
    # mpn4732877232
    Remanufactured Valve Body (GM6T40-1) by Sonnax®. Molded lead frame harness. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best automotive components from...
    One SKU fits all applications, saving time, money and confusionResurfaced OE channel casting eliminates warpage, burrs, and cross-leaks cost effectively
    $213.31
  • Sonnax® - Remanufactured Valve Body
    Sonnax®Remanufactured Valve Body (GM6T70-2)
    0
    # mpn4732877013
    Remanufactured Valve Body (GM6T70-2) by Sonnax®. Molded lead frame harness. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best automotive components from...
    One SKU fits all applications, saving time, money and confusionResurfaced OE channel casting eliminates warpage, burrs, and cross-leaks cost effectively
    $260.13
  • Sonnax® - Remanufactured Valve Body
    Sonnax®Remanufactured Valve Body (CHR194)
    0
    # mpn4732876988
    Remanufactured Valve Body by Sonnax®. With Internal Round Pin MLPS Switch. Molded lead frame harness. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best...
    One SKU fits all applications, saving time, money and confusionResurfaced OE channel casting eliminates warpage, burrs, and cross-leaks cost effectively
    $223.84
  • Sonnax® - Remanufactured Valve Body
    Sonnax®Remanufactured Valve Body (MER0406)
    0
    # mpn4732876937
    Remanufactured Valve Body (MER0406) by Sonnax®. Molded lead frame harness. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best automotive components from...
    One SKU fits all applications, saving time, money and confusionResurfaced OE channel casting eliminates warpage, burrs, and cross-leaks cost effectively
    $689.85




Sonnax is a globally recognized leader in innovative aftermarket drivetrain components. Established in 1978, Sonnax is one of the fastest-growing companies in southern Vermont. The company’s corporate headquarters include technologically advanced facilities where it designs and develops some of the best automotive parts in the industry! What’s more, Sonnax has technical development centers in many other U.S. States, including California, Georgia, New Jersey, Missouri, and Wisconsin. The company consists of a team of highly qualified specialists, remanufacturers, and rebuilders who do their utmost to further the company’s success and make it synonymous with excellence.

Whether on the road, on the street, or in the backcountry, trust Sonnax driveshaft components to enjoy an unforgettable driving experience! Made using the most sophisticated technology, Sonnax parts will improve the strength and performance of your driveline. Sonnax slip yokes are the perfect way to safely and reliably transfer power from transmission to driveshaft. Fully machined from billet steel, Sonnax bushing-style yokes will help eliminate leaking from the back of the transmission, noise, vibration, clunking, and other popular complaints. When it comes to extreme racing, you can’t go wrong with rugged roller bearing-style yokes. Forged from 4340 Chromoly steel, they are indestructible both on the street and on the track. These yokes are proven to handle the most extreme horsepower!

Along with steel yokes, the company engineers an extensive variety of aluminum components, including tubing, flange, weld, and bondable yokes. Sonnax yokes and tubing offer enhanced torque yields, maximum strength, and a perfect fit. They pair perfectly to replace your two-piece driveshaft and eliminate that weak carrier bearing. Rebuilding your torque converter? Sonnax is the only name you need to know! For many years, it has been a globally recognized full product line provider of torque converter parts that combine innovative technology with unmatched dependability. From common replacement parts to sophisticated performance converter kits, you are sure to find everything you need to complete your project.

Top-of-the-line Sonnax performance converter kits are designed taking in mind the performance characteristics of the specific vehicle. They will significantly improve acceleration and durability for long-lasting builds. Sonnex is highly praised for its line of converter friction rings made from advanced materials to handle the most demanding torque-holding applications. The company also offers an in-depth selection of valve body parts that are the number one choice for both industry’s largest transmission remanufacturers and individual transmission specialists. If you want to get your big repair jobs done faster, opt for one of the Sonnax remanufactured valve bodies. They are fully disassembled, cleaned, updated, and then hydraulically and electronically tested. And those looking to take their gas and diesel builds to the next step can choose from Sonnax high-performance and heavy-duty transmission products designed to withstand the challenges faced by racing and other hard-working transmissions.

Sonnax Reviews

4 reviews
Perfect for those looking for extra pressure for your transmission. Can be easily installed by any DIY technician. This kit will make you forget about low-speed shift harshness. Absolutely recommend!
Posted by Ian gordon (Kerrville, TX) / April 29, 20202017 Chevy Silverado
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