Lately my vehicle wants to stall and having a hard time staying in gear. I checked the trans fluid and there was no reading on the stick . I haven’t driven it since I filled it and I don’t notice any leaks.
Some leaks only happen under pressure. You may need to bring the engine to operating temperature and drive it. Then park it over a clean piece of card board and leave it set over night. This should determine if there is an external leak.
Another option may be an internal leak. Sometimes when the radiator busts internally the transmission fluid leaks into the cooling system. You may notice a discoloration of the engines coolant.