Back for som emore help since everyone was extremely helpful on my last post. I have been working on my first car for the past month or so and have noticed the transmission slips at times when changing gears. The car is a 1975 plymouth duster with an automatic tran. 225 slant six engine. The plan is to change the tran oil but for some reason i cant locate where to fill it from? or how to change it? would it be similar to a regular oil change? A detailed explination or pictures would be of great help!