Quote:
Originally Posted by Boston01X5
... I'm trying to find info about this lockup, not familiar with it - most cars I've owned just call it overdrive. I thought my car had a 5 speed with overdrive but I could be mistaken. ...
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Lockup and overdrive are very different things...
From Wikipedia...
"...impelling losses within the torque converter reduce efficiency and generate waste heat. In modern automotive applications, this problem is commonly avoided by use of a
lock-up clutch that physically links the impeller and turbine, effectively changing the converter into a purely mechanical coupling. The result is no slippage, and virtually no power loss."
and then...
https://en.wikipedia.org/wiki/Overdrive_(mechanics)