Why would my car start to not go while in drive and my oil is clay Brown color

Hello, if you know the incorrect transmission fluid went into the vehicle, the first thing you should do is get a technician near you to drain all the transmission fluid possible - including removing the transmission oil pan if possible - and replace it all to ensure the correct fluid is in then transmission. Following that, a full evaluation from a technician near you would be the first thing you should find - because they can tell you if the vehicle is repairable without extreme expense or if it's past a point of no return. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops