I wouldn't do it, mines got the front arb and some times I have to unlock it just to get it to turn, you'd be stuffed if you can't unlock it !
I can feel the strain on the front drive line through the steering wheel when the locker is engaged and only use it when absolute necessary as it prone to causing more grief like broken axles, blown C/Vs and alloy housings won't like it ether!
Take the advice above and buy some form of locker if you must have one.