B&M Shift Plus Automatic Transmission Shift Kit electronically recalibrates automatic transmission for optimum performance and extended life. It provides crisp shifts on any stock automatic transmission and eliminates shift overlap and excess wear on clutches and bands due to slippage. B&M Shift Plus Automatic Transmission Shift Kit allows you to improve shifting performance without removing the transmission pan or valve body. With a simple flip of the switch allows the transmission to operate in the performance or stock mode.; 50 state emissions legal.