The springs should be fine. The elockers only takes a few seconds to engage and that's usually only if your not moving. You have to run all the wiring to make them work. Some people using the E-locker ditch the electric solenoids and wiring and make them cable actuated for better reliability. The air locker (ARB) engages quicker but it too sometimes makes you have to roll a few feet to engage it. But you have to worry about air leaks, air compressor wiring and air lines. From a reliability standpoint they are about even. I have an E-locker in one of my trucks and and ARB in the other and neither one has ever failed to work.
As far as gear ratios it really depends on the size tires you pland to run. With the lift you want you can fit 33's, 35's and even 37's with some fender trimming. As a general rule of thumb 33's work best with 4.88's and 35-37 work good with 5.29's. If your gonna use this as a daily driver just remember that even though you change gears to work with the tire size difference there is still a big weight difference when you increase tire size. Unsprung weight makes the already power lacking 22r/22re even weaker.
