Re: 97 TJ Automatic Trans. Overdrive question.
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Where have you been? The lock up torque converter has been around for a while......
Anyway, although I've never actualy seen a cut away on one ..it's basically a clutch in that locks the turbine and the impeller in your fluid coupling between the engine and the trans internals. Before the adoption of this ...there was always a differential between the engine speed and the input speed of the trans. Although I really don't think that it can give any better gas mileage, due to the added load that it puts on an engine,...it does lower trans temperature.
I think that perhaps the dealer can set the parameters of when it kicks in with a DRB2 scanner ..... but I'm not sure. I really don't see the need for these things. Automatics have survived for decades without them without too many adverse side effects. The DC converter has the distinction, in some models, of self destruction, sending material throughtout the trans - mandating a rebuild.
Unhook the wire ..and throw on a big cooler.