zip kit sonnax 6l45 6l50 6l80 6l90Sonnax ZIP Kit for 6L45, 6L50, 6L80, 6L90 The Sonnax Zip Kit 6L45 6L90 ZIP is designed to address critical circuit pressure losses in GM 6L45, 6L50, 6L80, and 6L90 valve bodies. By sealing circuits within the main line, clutch apply control, solenoid feed, and lockup control, it resolves the root causes of common transmission issues. The kit also prevents end plug leakage and improves checkball sealing. Installation is quick with no reaming or special
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