Couple of thoughts, questions, whatever you wanna call 'em.....

A) Did you swap over to a Designa chassis, where you have a Series chassis that's modified for being a coil-sprung suspension; or are you keeping the original chassis then altering it for the suspension; OR, have you switched to a coil-sprung chassis, then modified it to fit the Series body to it?

B) Since you're using axles off of a coil-sprung vehicle (an RRC?), you'll have 3.54 diffs then, instead of the 4.7's (unless you swap them back in). What engine are you going to be using? Do you need to go back to the 4.7's to have it usable on the road w/ a 4-banger, or are you going to have something else that can make good use of the 3.54s on the highway?

That's a start.......