[ever_green]

symptoms of UNLOCKED TC:
- Increasing RPM without (or very little) increase in vehicle speed
- Slipping RPMs with throttle (rpm rises and falls smoothly yet quickly just like a CVT transmission)
- Engine speed rises by ~500 rpm
- can be induced by increasing change in throttle position (rate of change in throttle position)
- Depending on the vehicle, Torque Converter is usually unlocked below 30-50mph under any throttle

symptoms of LOCKED TC:
- vehicle speed increases along with RPM (relative)
- adding more throttle doesn't seem to affect RPMs much but engine load increases substantially (specially at higher gears and low engine speeds)
- engine speed slowly decreases by ~500rpm
- can be induced by decreasing change in throttle position (rate of change in throttle position)
- Depending on the vehicle, Torque Converter may lock up above 30-50mph under light throttle
- Depending on the vehicle, Torque Converter is never locked in first few gears (usually gears 1&2)

symptoms of GEAR CHANGES:
- engine speed suddenly changes abruptly and quickly, in excess of ~1000rpm specially at higher engine speeds
- This can often be felt, like a jolt
- Shifts can induce Ignition Timing dips, lean AFRs. TC lock/unlock doesn't.
- Gear shifts are Not usually induced by throttle 'changes', rather by vehicle speed and throttle 'position'