have replaced radiator ,old one busted dropping all of transmission fluid,then mixing with coolant,trying to flush out but having trouble getting all out.
Bud, all the following threads are on Transmission/Radiator issues, there may be some helpful info on one of them.
My only tip is to lift the rear tires maybe 1" off the ground. With about 5 degrees of forward slope 'on my driveway' I can get 4qts of the 8.5qts out every time. Drive around the area you live and force the trans thru all gears then Drain n Fill, 4 times will get to approximately 88% new fluid in the trans when using the 3.5qt typical drain and fill for calculation.