727 Problem

I have had a good think about it and as it has sat for 25 years and the new oil that we have put in has already turned black we think that the bands and or clutches are falling apart every time we put it in gear. Maybe they are falling apart because of the long 25 years sitting? Band adjustment is okay and oil level is checked before selecting gears, so will pull out and dismantle to find the issues! Yes rusty this one will just be a cruiser as it has power windows , air ,steer , leather etc and yes I have a Valiant charger(2 door) with 410 and five speed manual that runs low elevens also.