B&M 70380 - ShiftPlus Shift Improver - GM 4L60E/4L80E intake-manifold 1959-1964 Chevrolet El Camino 283

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B&M 70380 - ShiftPlus Shift Improver - GM 4L60E/4L80E intake-manifold 1959-1964 Chevrolet El Camino 283Overview: The new design of the B&M ShiftPlus Electronic Shift Improver allows you to improve the transmission's shifting performance without removing the transmission pan or valve body. A simple flip of the switch allows the transmission to operate in the performance mode. Flip it back and you are back to stock! Installs in just minutes, the ShiftPlus simply recalibrates your transmission's hydraulic system electronically for optimum performance and