gebills,
I have a 07 2500, and it has the 3500 rear springs. I also have the Firestone Air bags and only need to put 20 PSI in them to make mine level. My 3400 BH loaded has a pin weight of 2700 and with no air only sets me down 3 inchs, which actually makes me level. My truck is a 4 x 4 and sits high in the rear unloaded. When I bought the BH I figured I'd need the bags so put them on just prior to picking up the unit, turned out I didn't need them, but not sure for you.
I have a 07 2500, and it has the 3500 rear springs. I also have the Firestone Air bags and only need to put 20 PSI in them to make mine level. My 3400 BH loaded has a pin weight of 2700 and with no air only sets me down 3 inchs, which actually makes me level. My truck is a 4 x 4 and sits high in the rear unloaded. When I bought the BH I figured I'd need the bags so put them on just prior to picking up the unit, turned out I didn't need them, but not sure for you.