Just picked up a high mileage 2012 and looking to do a transmission fluid change. I see the full capacity is 12 qts and the pan hold 7.5 qts. All the how-to articles show just draining the pan. Any easy ways to get the rest out? I would rather not contaminate my new oil with 4 qts of old oil? My old F-250 there was a way where you could unhook the tranny cooler line and start the vehicle with a clear hose on it and drain the rest of the fluid and refill so you could get a complete fluid change. Worked perfectly.