Quick question about changing rear oil seal on my 1968 Ford Galaxie Convertible 6.4 390. I got a leak and I am taking the car to the garage to get it changed but my question or concern is. I know they got to drop the transmission to get to it but the car is overseas and I cannot get TYPE F fluid. So when they drop it will they have to replace the transmission fluid or it will stay in? Not a mechanic so I don't know. Urgent taking the car in about 12 hours from now.