Performance of GM Powerglide® transmissions can now be improved with a new Super Hold servo assembly that provides 30% more apply area than the original servo, introduced by Sonnax Industries, leading supplier of innovative drivetrain components.
The larger apply area, created by a unique dual-piston design, increases band apply force at existing line pressure or allows for 20% to 30% line pressure reduction while maintaining the same apply force, freeing up horsepower. Designed for drag racing vehicles seeking positive trans-brake engagement, the Sonnax Super Hold servo reduces vehicle rocking and increases stability.
The Sonnax Super Hold servo assembly addresses burned band problems commonly associated with Powerglide servos used in high-performance applications,
where there is residual apply force in high gear when the band is supposed to be released. At higher pressures this residual force can overpower the return spring, resulting in the band not fully releasing, burning the band, and robbing power in high gear. Positive sealing throughout the Super Hold servo prevents excessive leakage that can reduce band force or prevent full release. The return spring in the Super Hold servo is tunable to ensure full servo release even at higher line pressures.
The Super Hold servo’s patented design fits completely inside the case in the same space as the original equipment servo assembly. This simplifies installation and avoids external cover clearance problems found with oversized servo assemblies.
The Sonnax Super Hold servo assembly 28821-09K is available at leading transmission parts distributors and is priced significantly less than other oversized servos. For more information, visit www.sonnax.com/superhold/powerglide.
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