fluid type for A-518

There is a price difference between ATF+4 and Dex III of VI, but not that much. In the very early 90's Chrysler was discovering that the shear stability and friction properties of Dex was not actually living up to what they ahd originally thought and were transitioning to ATF+3. ATF+4 is of course a synth and continues with the shear and friction properties of ATF+3.

There's no reason to disagree with what Chrysler was finding out with all Torqueflite trannys that the ATF+ line of fluids was technologically better and better suited to the design.