April 21, 2021
In GM 8L45 and 8L90 transmissions, the 1-3-5-6-7 accumulator piston is utilized during apply of the 1-3-5-6-7 clutches to smooth engagement. Wear at this bore allows 1-3-5-6-7 clutch apply oil to exhaust resulting in ratio codes, harsh or delayed application of the clutch pack, burnt clutches and slipping/flares. Installing Sonnax 1-3-5-6-7 accumulator piston kit 154740-15K eliminates leaks to restore normal shift operation and feel.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.