Servo Piston Kits
- O-Rings (2)
Drag racing Powerglides® generate higher line pressure than the OE servo-piston metal seal ring was designed to withstand. With pressures over 200 PSI, the end gap of the OE seal leaks, causing a partial-apply condition in low gear that can result in higher drag, heat and wear of the high clutch. The Sonnax No Leak Powerglide® Dual O-Ring Servo Piston 28821-01K uses dual O-ring seals for superior, positive sealing. In applications with a distorted servo piston bore or case flex, O-rings will conform to the bore surface, a feature not possible with metal sealing rings. Another source of leakage is the servo pin thru bore. The Sonnax No Leak Powerglide Dual O-Ring Servo Piston 28821-01K yields a precise, slip fit with the servo pin to further improve performance.
- Designed for high pressure drag racing Powerglides®
- High quality billet aluminum construction
- Rubber O-Rings offer improved sealing over OE metal sealing rings
Sonnax Servo Cover Kits 28821-03K and 28821-06K are designed to replace other covers and require no modifications to the case. They can be installed with servo piston kits 28821-01K or 28821-02K.
Sonnax Master Servo Kits 28821-04K and 28821-07K are designed to replace the piston and cover and require no modifications to the case. The kits feature the no leak dual O-ring servo using two O-ring seals for superior, positive sealing. In applications with a distorted bore or case flex, O-rings will conform to the bore surfaces, a feature not possible with metal sealing rings. Precise slip fit with apply pin further improves performance.
In addition, Sonnax Master Servo Kits 28821-05K and 28821-08K are designed to replace the piston and cover and accept either two PTFE seal rings or two OE metal sealing rings. Made with the same high-quality billet aluminum as our dual O-ring servos, these servos will give you the positive apply needed in high pressure racing conditions.
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