Performance & Replacement Transmission & Drivetrain Parts

Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic...

Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic and manual transmissions for street and strip applications, torque converters and clutch sets, flexplates and flywheels, plus limited-slip differentials, spools, lockers, ring and pinion sets, driveshafts, U-joints, axles, bearings, C-clip eliminator kits, transfer cases, shift kits, and rebuild kits. We also have a wide selection of trans-brakes, shifters, cables, and accessories—everything you need to put the power to the ground, Summit style.

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Sonnax Input Housing Sleeve Kits 77733-51KA

Automatic Transmission Rebuild Components, Input Housing Sleeve Kit, 4L60, 4L60-E, 4L65-E, 4L70-E, Kit

Part Number: SOX-77733-51KA

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/13/2026 if shipped by air

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Estimated Ship Date: Monday 4/13/2026 if shipped by air

Sonnax Smart-Tech Clutch Kits 77734-01K

Automatic Transmission Clutch Packs, Smart-Tech, Designed for Sonnax Smart-Tech Input Housing Kits, GM, 4L60, 4L60-E, 4L65-E, 4L70-E, Set of 8

Part Number: SOX-77734-01K

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/13/2026 if shipped by air

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Estimated Ship Date: Monday 4/13/2026 if shipped by air

Sonnax Input Drum Reinforcement Kits 77733-02K

Input Drum Reinforcement Kit, 4L60, 700R4, 4L60E, 4L65E, 4L70E, Kit

Part Number: SOX-77733-02K

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 4/13/2026 if shipped by air

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Estimated Ship Date: Monday 4/13/2026 if shipped by air

Sonnax Input Housing Sleeve Kits 77733-52K

Automatic Transmission Rebuild Components, Forward, Input Housing Sleeve, 4L60, 4L60E, 4L65E, 4L70E, Kit

Part Number: SOX-77733-52K

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 4/13/2026 if shipped by air

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Estimated Ship Date: Monday 4/13/2026 if shipped by air

Sonnax Clutch Apply Plate and Seal Kits 77733-06SVC