I get so caught up in the fun of cutting and everything that I always forget to measure. Same with my old Mitsu. I believe that the rear was about 5.5"?
The truck is low as heck. I put in low profile bump stops up front and they're only about an inch away from the control arms. Almost any bump will bottom it out. The cheapo oil shocks I put on the front also don't help. This is about as low as you can go without spindles (Cheeto

) The radius rods are REALLY close to the steering linkage. I've been thinking of moving the steering box up a bit to remedy this.
Amazingly enough I haven't had the truck aligned since I dropped it. I've put well over 4000 miles on the drop and no tire wear or pulling problems. I don't reccomend this though. Definately get an alignment after front suspension lowering. I'm just dumb and lazy.
Out back there's maybe 2.5" of travel. I still hauled 2500 lbs of concrete mix. The axle was riding on the frame but it still did it. That's why I need to get the air bags on. That way it'll ride nice and smooth.
When I bag it I want it to sit right about where it is now. I kinda like the stance and the fatty tires for some reason.
Way down the road I'd love to build a new frame for it. Using 2x4 steel will allow you to 'body drop' it without doing much cutting at all. Building a new frame will allow me to reuse the stock front suspension and mount it up higher in the rails so the cross member will be even with the bottom of the frame rails.
I was reading a recent issue of Classic Trucks where Fat Man Fab was building a chassis from scratch for an old Ford. That got me fired up about a new frame for the Dodge. The same issue has a 78-ish extra cab Ram with a Chisholm 5-7 drop on it in the Readers Rides section.