tbran
Guest
the G hydro is a 4 X 6 (Cubic inch) and the 78-79 Fs had the same basic unit. In 80 i think the F2 went to the 6X6 hydro with a dual hydraulic pump dedicating one section for charge pump pressure. The 4X6 had an internal geroter pump for charge pump. The output shfts are the same but inputs are different g vs f. 4X6's can be interchanged but orientation is different in a few aspects and some work is needed. Also sheaves are different and belt could be an issue. 6X6 cannot be interchaged with 4X6 without major major work.