Slipping gears
Delayed engagement when shifting
Grinding or shaking during shifts
Burning smell
Transmission fluid leaks
Warning lights on the dashboard
Strange noises in neutral or while driving
Difficulty shifting into gear
Vehicle hesitates or loses power
RPMs rise without a matching increase in speed
Clunking, humming, or whining sounds
Transmission fluid looks dark or smells burnt
Check engine light or transmission warning light stays on
Car goes into limp mode
Shifts feel rough, hard, or jerky