So far my D30 has been nice to me. Hooking them up to a ranger is another thing, not as simple as the control arms for a D44. I have seen people use them under their ranger with the stock arms but fine tuning stock jeeps ares isnt something easy to do since your mount points have to be exact compaired to a set that are adjustable. I bought longarms for mine and havent looked back plus if I do go bigger on my front axle then all I have to do is weld mounts to it for my longarms and be good to go.
Now is the D30 a CAD axle or not (Central Axle Disconnect, more info on it in the tech library)?
As for the rear end, Jeep guys swap theirs out for the exploder 8.8 from their D35. The good thing is the D30, Jeep D35 rear share the same bolt pattern as the ranger axles so no need for a rim swap there.