That's great to hear, if your temps are higher in the transmission it can cause issues like slippage.
Transmission fluid if its not in the right temperature range can cause all sorts of issues not to mention a shorter life span.
I would suggest that if you want to keep the air dam that you install an external transmission cooler and put it in front of your a/c evaporator and radiator. Just be careful and get it properly installed with the right fittings, doing a half-assed job on your expensive vehicle with an auxiliary transmission cooler could end badly. When you use clamps and ordinary rubber hose on transmission coolers they can end up popping off.
I would also recommend that you get a temperature gauge and measure temps of your transmission housing just to be sure its that, a cheap infrared no contact thermometer will work just fine and let you check temps elsewhere too.
Either that or make up an aluminium cowling which will scoop up some cool air from the airstream below your car and let it push air onto the transmission.
Depending upon your current weather situation that could have been the issue all along, the front air dam.
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