Longbox,
Slight consideration means that have accepted the fact that I'm going to be filling frequently. Improved mpg would simply be a bonus.
I have no idea what rear diff ratio I am running. The truck is a 1970 longbox and has the original auto column so I am assuming is was running a small block if that is an indicator.
I have considered keeping the 700 for the lack of modification but am a bit set back by the cost of rebuild.