8L45, 8L90 Shift Zip Kit Part No. 8L45-8L90-SHIFT-ZIP For shift-related complaints. Drop-in Zip Valve parts install quickly and easily, no reaming or special tools required Uniquely designed parts address root causes of shift complaints by sealing critical pressure circuits Detailed technical booklet included with in-depth rebuild and inspection tips for comprehensive valve body repair Contents S1/S5 Clutch Control Valve Kit Fits 1 of 2 locations S2/S3/S4/TCC Clutch Control Valve Kit Fits 1 of 4 locations 1-3-5-6-7 Accumulator Piston Kit Signal Accumulator Pistons, Sleeves, Springs, End Plugs & O-Rings (7) Warning: Later design valve bodies have updated the S4 valve to a single .531" diameter size. Sonnax clutch control valve included in this kit cannot be used in this location or shift complaints will occur.