Hello 2011 Quest SL 193K. When cold getting a shuddering on take off, a slipping that feels like drivetrain. Dissapears when at operating temp.

Somewhat fearing the transmission. Has had trans fluid changed every 75K. If that's true any idea on repl cost? Would go for a low mileage used unit since the car has high miles. Any advisment is appreciated. Overall been great car AC compressor however has been a rough spot.

75K isn't a fabulous change interval. If it does turn out to be the tranny, get the donor TCM along with the transmission. You'll save yourself a ton of initialization headaches. Swapping the trans and TCM as a unit makes it plug-and-play.

Check that you haven't got a tear on your intake pipe between the air box and throttle body.