Have a 69 5.0 HO with a AOD. all in a 56 ford runs great but after 3rd it doesn't get into OD. Trans and motor have been sitting for about 3 years. Did take the pan off and serviced the filter, looked really clean inside. Haven't driven much since the first run, have a couple of water leaks to attend to, but would be nice to find a simple solution. Help please...Gerry