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Sonnax Clutch Apply Piston Kits

4.75 out of 5 stars 4 Customer Reviews

Sonnax clutch apply piston kits drastically reduce the likelihood of clutch plate distortion. Due to OE design shortcomings, flexing and bowing of the backing plate is common in some GM transmissions, often causing them to suffer failure of the 4-5-6 clutch assembly. These kits increase the piston-to-plate apply ring surface area to strengthen and reinforce the assembly, along with a more rigid backing plate design that outperforms OE and aftermarket components. Sonnax clutch apply piston kits easily tackle these common weaknesses.

Kits include:

* Apply piston
* Apply ring
* Piston dam
* Backing plate

Results 1 - 3 of 3

Automatic Transmission Rebuild Component, Servo Piston, Clutch Apply Piston, 4-5-6 Gear Clutches, 6L80, 6L90, Kit

Part Number: SOX-104960-01K

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Monday 10/26/2026 if shipped by air

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Estimated Ship Date: Monday 10/26/2026 if shipped by air

Clutch Apply Piston Kit, Automatic Transmission Rebuild Components, 6L80, 6L90, Kit

Part Number: SOX-104960-10K

Not Yet Reviewed

Estimated Ship Date: Monday 10/26/2026 if shipped by air

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Estimated Ship Date: Monday 10/26/2026 if shipped by air

VALVE BODY KIT

Part Number: SOX-104960-20K

Not Yet Reviewed

Estimated Ship Date: Monday 10/26/2026 if shipped by air

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Estimated Ship Date: Monday 10/26/2026 if shipped by air

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