how much should the rpms drop when the torque converter locks up.
You can figure out what the engine is spinning in what gear if you know the gear ratio and final drive (easy enough to find). Which transmission do you have? 3 or 4 speed?
Here is an excel chart for engine RPM at different speeds for a cavalier with the 3 speed 3T40, with P195/65 tires and TCC lockup.
