Terrible answer but, maybe.My question is this: for a largely street and fire trail Jeep with a 2" suspension lift and 31s (maybe 33s when the 31s die and after a BL and MML), would the Teraflex or UCF plates (needing only a MML or BL, respectively, which were likely going on anyway) be a viable option for increasing ground clearance without necessitating the purchase of a new driveshaft, SYE, adjustable control arms, and and and or would all the other stuff be needed anyway?
You really won't know until you get it on. At the very least I'd guess you'd need adjustable upper or lower rear control arms. Remember the jeep doesn't know if you're adding height due to springs or a tuck. So if you raise the jeep 2" and then raise the belly 2" (total guess on height gain) as far as the TC is considered it's a 4" lift. Now the good thing is if you add a tuck such as the UCF and run into vibrations you can always lower it down with spacers or washers until the supporting mods are installed if needed.