65 904 leaking pretty bad but don't know where?

I've got this 170 slant six with a 904 cable controlled automatic in my 65 Valiant. It's automatic column shift with the cables. One for parking and one for the gears. I've had to do adjustments to the cables to get everything shifting right. I also had to install the parking lock spring inside the parking cover. When I did that I installed an NOS cover gasket. I installed a used speedometer gear and an NOS neutral switch. It sits during the week and I usually go on the weekend and start it up and sometimes drive it around the neighborhood. Over the week it leaks out a good bit. I put it 3 quarts yesterday but added 3 more before that maybe 2 months ago without really driving it. You can see the wet spot on the ground when you move it. So it's a considerable leak. I changed the filter and gasket a year ago. It doesn't appear to be leaking. It appears to be concentrated around the parking lock area and the shifter cable adjustment area. But there's no o-rings on those cables. I installed a new cover gasket in the rear. Is there something I'm missing? Or is there another common leak area on these cable control transmissions? It's hard to pinpoint accurate the leak because the transmission exterior is rusty colored not dirty just external rust, probably from the Georgia red clay staining it over the years. Any ideas? I doubt I can drive it far with a leak like this.