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Transgo Shift Kit (SK 350-3) Transgo Shift Kit (SK 350-3). Transgo Shift Kit (SK 350-3). TRANSGO Shift KIT. Stick Shift. Increased line pressure for firm 250, 250C, 350, 350C. GM 250/250C, 350/350C SHIFT KIT® Valve Body Repair Kit 350-3. Reprogramming Kit™ Manual Shift Control Fits 350 1969-81 TransGo Shift Kit 350-3 Manual Shift Fits 250, 350 Non-lockup 1969-86 (SK350-3)*. Includes all of the latest updates for 2020 !