A998 Trans in '66 Dart

I have a built 998 in a 66, fits the same as a 904. Low first gear, has hydraulic lockup
circuit ( no electronic controls) I had the converter rebuilt for HD service. It lowers
the RPM's 200-300 after it locks up and has a direct coupling feel like a 4 speed. I
have had loads of 904 transmissions and the 998 is better.