Slipping gears
Delayed engagement when shifting into drive or reverse
Rough, hard, or jerky shifting
Transmission fluid leaking under the vehicle
Burning smell from the transmission
Grinding, whining, humming, or clunking noises
Warning light on the dashboard
Transmission fluid that is dark, dirty, or smells burnt
Vehicle shaking or vibrating while driving
Difficulty staying in gear
Engine revs rising without a matching increase in speed
Transmission overheating
Car not moving when shifted into gear
Check engine light with transmission-related trouble codes