Sonnax has introduced two Zip Kits that target the root cause of multiple shift-related complaints and converter-related complaints, respectively, by sealing the critical circuit pressure losses in the GM 8L45 and 8L90 valve body. Kit #8L45-8L90-SHIFT-ZIP helps prevent pressure loss within the signal accumulator, clutch control and 1-3-5-6-7 accumulator piston circuits. Kit #8L45-8L90-TCC-ZIP helps prevent pressure loss within the lube, converter limit, line pressure and converter apply circuits.
