727 vs. 904

I've got a 727 in my son's '81 D150, and I've got a 904 in my '71 Valiant. Any preferences on tranny's. I was wondering if the 904 would ride just as good in the truck and vise versa. Any input?
ive got them both and the 904 is good for a 10nth or so but as for ride i dont believe there any diffrence in ride though and i do believe though the 727 is a little stronger from what i hear