I'll repeat my mantra: The Electrolux-made Frigidaire TL'ers have controlled tub indexing. It is not 'freewheeling'.
Sorry if you've read this before. I posted it in another thread, too:
If you set the water level to its lowest setting and the agitation speed to slow, you can reach in and grab one of the agitator fins during agitation. The increased resistance somehow shifts power from the agitator to the tub, which then indexes according to how short the agitator's clockwise stroke was.
You can actually feel the agitator 'lose power', and then power instantly shifts to the tub, which begins indexing. It has nothing to do with the tub just whirling around capriciously because there isn't a tub brake. When grabbing an agitator fin, it's actually fairly easy to completely prevent a clockwise stroke. Then the tub indexes almost one complete revolution.
During a regular wash cycle, it takes a fair amount of muscle power to try to stop the tub from indexing by grabbing the upper rim. That indexing action is definitely being powered!
This is why there is little indexing when the load is light (less resistance against the clockwise stroke of the agitator), and a lot of indexing when the machine is dealing with a large, heavy load (a lot of resistance against the clockwise stroke of the agitator).
Unfortunately, I don't know, mechanically, how this transfer of power is accomplished within the transmission.