Super Hold Servo Kit Powerglide

Name: Super Hold Servo Kit Powerglide
Brand: SONNAX
SKU: 852-28821-09K
Price: 310.57 USD
Availability: InStock

^$310⁵⁷

Ships on Sep 03, 2026

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GM Powerglide

Super Hold Servo Kit

Powerglide

Servo Assembly
Cover Gasket
Case-to-Cover O-Ring
Servo Pin Seals (2) PTFE, 1 extra
Primary Piston Seals (2) PTFE
Return Spring

Sonnax super hold servo kit 28821-09K dual piston design has 30% more apply area than the OE Powerglide servo. The patented design fits completely inside the case, and the external cover clearance is the same as original servos. The larger apply area will increase band apply force at your current line pressure or allows you to reduce line pressure by 20% to 30% while maintaining the same apply force. Improved sealing throughout reduces fluid loss and is optimized for low friction movement.

30% More apply area
Allows line pressure to be reduced, freeing up horsepower
Dual seals for piston to case bore
Pin-to-case PTFE seal
Fits into the same space as a standard servo assembly

Part TypeAutomatic Transmission Servo Piston

BrandSONNAX

Package Height5.4

Package Width5.9

Package Length6.0

Weight1.97 PG

Part CategoryReplacement Parts

Part FitmentSemi Universal

Vendor Part Number28821-09K

Package Qty1

Package TypeEA

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

Super Hold Servo Kit Powerglide

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