3) WANT YOUR TRANSMISSION TO LIVE LONGER? HERE ARE TEN THINGS YOU SHOULD NOT DO
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1.    Don’t Leave The Shift Lever In Park (P) Without The Parking Brake On. If another vehicle were to even tap yours in the front or back while parked it could cause a part inside your transmission (the parking pawl) to break leaving your vehicle to roll down the street unattended.
2.    Don’t Downshift To “Brake” At Traffic Lights. A forced downshift at high engine RPM causes excessive wear on transmission friction components (clutches and bands).