The OE Powerglide servo design is inherently flawed. Its spring-powered design suffers from an improper apply/release ratio that is responsible for otherwise unexplained band failures, input shaft failures and staging issues. Now known as the pin bias effect, the resulting burnt bands, broken parts and inconsistent operation have plagued the Powerglide for years, leading many to give up on this transmission and seek other options.
Sonnax Smart-Tech® ratio-style servo kit 28821-10K is a revolutionary part that conquers the pin bias effect once and for all, making this the ultimate choice for running Powerglides in ever more extreme applications. The unique design has the same apply area as the OE Powerglide servo, but increased release area so the servo is hydraulically released like other modern servos such as the C-4, C-6 and 4L60.
May 09, 2017
August 23, 2017