| Delay then thump |
“I select Drive and it pauses before engaging.” |
Hydraulic pressure, clutch application, valve body, converter fill or seals |
| Shudder at steady speed |
“It vibrates gently when cruising.” |
Torque-converter lock-up, valve body, driveline or wheel/tyre issue |
| RPM flare |
“The revs rise before the next gear catches.” |
Internal clutch slip, pressure loss, valve body or worn sealing elements |
| Harsh downshift |
“It bangs as I slow down.” |
Adaptation, pressure-control solenoid, valve body, mounts or internal wear |
| Whine or hum |
“The noise changes with road speed.” |
Transmission bearings, differential, propshaft, driveshaft or wheel bearing |
| Warning / limited gears |
“The gearbox warning appears and it stops shifting normally.” |
Stored TCM DTC, pressure/control fault, sensor data or protection mode |