All automatic transmissions have clutches of sorts. I think what you mean
is when the torque converter locks, so it emulates a solid shaft instead of
a lossy fluidic coupling.
 
Yeah, that's almost certainly what I mean. The mechanic who first explained it to me called it a clutch, whether from his own ignorance, laziness of speech, or (most likely) "baby talk for the layman customer". I got in the habit of thinking of it that way, a habit I'll now try to replace with the proper term.

My understanding is that the 3-speed automatics I grew up with did not have that feature.

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