4th Gear Super Hold Dual Servo Kit 4L60, 4L60-E, 4L65-E, 4L70-E

Name: 4th Gear Super Hold Dual Servo Kit 4L60, 4L60-E, 4L65-E, 4L70-E
Brand: SONNAX
SKU: 852-77767K
Price: 97.36 USD
Availability: InStock

^$97³⁶

Ships on 09/10/2026

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GM 4L60/4L60-E/4L65-E/4L70-E

4th Gear Super Hold Dual Servo Kit

4L60, 4L60-E, 4L65-E, 4L70-E

Super Hold Servo Assembly
Steel Washer

Vehicles with GM 4L60, 4L60-E, 4L65-E and 4L70-E transmissions often exhibit poor 3-4 shift quality and experience band failure in performance applications. The Sonnax 4th gear super hold dual servo assembly 77767K features 40% more apply surface area for greater holding power.

40% More surface area for greater holding power
Can be used with OE, Corvette or Sonnax performance 2nd gear servo assemblies
Easy to install - transmission removal is not required
D-ring seals for improved sealing
Billet aluminum cover

High-Performance Servos, Servo Kits, and Components to Meet the Toughest Transmission Challenges

Sonnax servos progressively increase band force as line pressure increases and are the perfect upgrade for more holding power without excessively harsh shifts.

Part TypeAutomatic Transmission Servo Piston

Product LineSonnax Servo Kit and Components

BrandSONNAX

Package Height2.3

Package Width4.3

Package Length4.8

Weight0.98 PG

Part CategoryReplacement Parts

Part FitmentSemi Universal

Vendor Part Number77767K

Package Qty1

Package TypeEA

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Please click here to download the instructions PDF file

Some parts are not legal for use in California or other states with similar laws / regulations

4th Gear Super Hold Dual Servo Kit 4L60, 4L60-E, 4L65-E, 4L70-E

High-Performance Servos, Servo Kits, and Components to Meet the Toughest Transmission Challenges

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