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Vehicle Info NeededSONNAXPART NUMBER: 852-28821-02K
Servo Piston Kit Sealing Ring Type
$7275
Ships on 09/08/2026
Lowest Price GuaranteeServo Piston Kits
Servo Piston KitSealing Ring Type
Sonnax servo piston kit 28821-02K for GM Powerglide® units features dual 18608T PTFE seal rings. These rings are configured to be interchangeable with the OE cast aluminum seal ring for maximum flexibility. The piston can be assembled using only one seal ring for lower friction, two aluminum seal rings or any combination in between. Sonnax also offers servo piston kit 28821-01K with dual O-rings 28821-OR for use with worn cases.
- Piston
- PTFE Seal Rings (2)
- Cover Gasket
Sonnax servo piston kit 28821-02K for GM Powerglide® units features dual 18608T PTFE seal rings. These rings are configured to be interchangeable with the OE cast aluminum seal ring for maximum flexibility. The piston can be assembled using only one seal ring for lower friction, two aluminum seal rings or any combination in between. Sonnax also offers servo piston kit 28821-01K with dual O-rings 28821-OR for use with worn cases.
- High-strength aluminum piston
- Piston features a rounded profile for better stress distribution
- Dual PTFE seal rings for better seal and low friction
- Includes cover gasket
Part TypeAutomatic Transmission Servo Piston
Product LineSonnex Servo Piston Kits
BrandSONNAX
Package Height2.5
Package Width4.0
Package Length4.5
Weight0.355 PG
Part CategoryReplacement Parts
Part FitmentSemi Universal
Vendor Part Number28821-02K
Package Qty1
Package TypeEA
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