68 Valiant Auto 3 speed tranny on Slant 6

Cooling line to radiator?
I bought my 68 in CA and after working on it most of the day, Max and I took it out to pick up pizza. When we came out, the car would not move. Previous owner had run hose from trans to rad and one of the clamps let loose. Screwdriver, 3-4 qts of ATF and we were in business.