It won't let me add info. Just the title. Anyways... My car is leaking transmission fluid while running. I don't think it leaks much while sitting, but when it's running it leaks. What should I look for? Or if I bring it to a shop, what should I expect to pay?

look for the origination point. a car wash that has the hand held type of sprayer can be useful. clean it up, drive for a bit and then look it over. if it only leaks while the engine is running, that does eliminate the pan gasket to an extent.

Usually the rear seal . . . . sometimes the front seal . . . . nothing you can fix yourself: the transmission will be coming out of the car.

There migth be a crack in the oil bowl.Transmiisin is importan for this reason i think you should go to the service

It help to go the car very fast