Dana 70HD - Spring Perches and Gears

[Mattman2010]

I have a 85 C30 crew cab that I am converting to a single wheel 4x4 truck. As we all know the 14b out of a k20 and the Dana 70HD out of the c30 have the spring perches at different spaces. I swapped k20 spring brackets onto the c30 frame to compensate for the difference in the spring spaces. Well now that I did that and I looked at pictures of the truck before I started to do the swap, I kinda think I want to go back to a dually, it just looks cool.

So what I am asking is, how hard would it be to move the spring perches on the Dana 70HD axle to fit the same width as the 14b? I ask this because the k20 spring hangers are a lot taller than the c30 spring hangers giving me more of the 4x4 look, and should make it about the right height to be a little taller or level with the front after I get the front converted to 4x4.

Also how hard is it to swap gears in the Dana 70HD rear end? I have a Dana 44 front axle that I plan on using till I can find a Dana 60 front end for a dually and it has 3.73 gears I want to go with 3.73 gears for more of a highway friendly gear ratio. I do not plan on towing with the truck that often, so 3.73s will still allow me to tow, but also allow me to get better gas mileage.

I also want to point out that this is the first axle swap I have ever done, and I have never moved spring perches or changed out gears before.

Thanks, Matt