At the most, the front Aussie should only click softly during a turn when you're in 2wd. In the rear, any lunchbox locker (aside from the No-Slip) is going to exhibit some negative traits on the street whether you're in 4x2 or 4x4. Lurching and sometimes some fairly loud snaps and bags can be expected out of a rear lunchbox locker (No-Slip locker excepted) on the street even in 2wd.
I'm not sure if what you're experiencing is that or more, but what I described is why I never recommend any lunchbox locker for the rear axle with the lone exception being the No-Slip which while it's about $100 more to buy, is a much better behaved lunchbox locker when installed into the rear axle.
But the front Aussie shouldn't be making such a commotion when in 2wd, I'd take a look inside at it and see what's going on. Also, how are your front axleshaft u-joints? Could one of them coincidentally gone bad after you installed the front Aussie?