They act the same as any other lunchbox locker on the road, you WILL notice it. In tight corners it clicks and clunks. When shifting it will sometimes grab and really pull the Jeep one way or the other. It will squeel the inside tire in a corner if taking it while on the gas. It's totally livable once you learn how to drive with it, but you will still know it is there.
If you want absolutly no on-road issues than a selectable locker is your only choice.
He is asking about the dana 30. You will NOT notice it in 2wd on the street except for some clicking when turning at low speeds. It will not grab you and jerk the jeep when you give it gas or make the tires squeel. Just get one and install it and be done with it. It makes a huge difference offroad.
It makes a huge difference off road. You will be able to crawl up things you would have never even tried before. It will be the best $250 you spend on the jeep. I can't comment for on road because I have locking hubs. I unlock when on road and nothing spins inside the front diff thus no difference from before.
Oh, I see it now. So it really does "lock" the front differential.
I understand...it allows one to go faster, but not one to go slower than the engine speed. So if you're turning the tires at say, 100 rpms and making a left turn, the left tire must stay at 300 rpms but the right tire can go faster to compensate for the longer distance traveled.
Offroad though, if you've got one tire up in the air it must go at least 100 rpms because that's what speed the engine is turning it at. Gotcha...
I can't tell my front axle has a locker inside when I'm in 2wd. It's a Powertrax No-Slip and it doesn't click, make noise, or in any other way make its presence known in 2wd. That's no matter if my front manual hubs are locked or unlocked. If I forget to unlock my front hubs after wheeling, there's no clue to remind me to unlock them so I may accidentally drive around for weeks with them locked.
So there's no reason to fear a front locker in a TJ and you don't need manual hubs unless you want them for other reasons as I did. A Lockrite acts about the same too, and I would expect an Aussie to be on a par with the others too... unnoticeable.