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I'm going to assume that you are asking about front lockers rather than rear ones because your post only mentions front diffs.
For a 2011+ Ram 1500 the only aftermarket diff available is the Auburn LSD that recently came out, and of course the Mopar ones. Neither offer a locker, and those that I mentioned are only for the rear. In fact the only Ram you can get lockers for is the Power Wagon which comes with them (and I suppose you could probably buy those aftermarket for a 2500 gasser from Mopar), all other Rams can only be had with LSDs or open diffs from the factory. That said, I'm sure somebody makes aftermarket lockers for the HDs.
There are no replacement front diffs other than the Mopar ones (at least that I know of), and those are all open. Nobody makes a front locker (or LSD) for them, and to be honest you don't want a front locker for an IFS truck, you'd break shafts.
Personally, my ideal setup would be an LSD rear and locker up front, because day-to-day (i.e. non-off-road conditions) an LSD is much more useful, but you would only engage the front when a situation calls for 4wd already anyway. That said I'd never want that setup in an IFS truck, only one with a live axle up there.
The turn off for lockers for me (at least factory ones) is that they can only be used at 5MPH or less and in 4 low, so I can't really think of a situation that I'd ever use them. Unless I was in really deep mud or something, but I've been up to the top of the front bumper in mud and the LSD rear and 4 lock pulled me right out-which is also why I don't really see a need for a locker personally.
I'm sure those factory ones I've mentioned can be overridden to work at higher speeds and in 4 high or even 2wd (In fact I'm pretty sure I've read that the Power Wagon ones can), but again, I've never felt the need for one. The Chevy auto E-locker is pretty cool, but I've also heard they are pretty weak.
For a 2011+ Ram 1500 the only aftermarket diff available is the Auburn LSD that recently came out, and of course the Mopar ones. Neither offer a locker, and those that I mentioned are only for the rear. In fact the only Ram you can get lockers for is the Power Wagon which comes with them (and I suppose you could probably buy those aftermarket for a 2500 gasser from Mopar), all other Rams can only be had with LSDs or open diffs from the factory. That said, I'm sure somebody makes aftermarket lockers for the HDs.
There are no replacement front diffs other than the Mopar ones (at least that I know of), and those are all open. Nobody makes a front locker (or LSD) for them, and to be honest you don't want a front locker for an IFS truck, you'd break shafts.
Personally, my ideal setup would be an LSD rear and locker up front, because day-to-day (i.e. non-off-road conditions) an LSD is much more useful, but you would only engage the front when a situation calls for 4wd already anyway. That said I'd never want that setup in an IFS truck, only one with a live axle up there.
The turn off for lockers for me (at least factory ones) is that they can only be used at 5MPH or less and in 4 low, so I can't really think of a situation that I'd ever use them. Unless I was in really deep mud or something, but I've been up to the top of the front bumper in mud and the LSD rear and 4 lock pulled me right out-which is also why I don't really see a need for a locker personally.
I'm sure those factory ones I've mentioned can be overridden to work at higher speeds and in 4 high or even 2wd (In fact I'm pretty sure I've read that the Power Wagon ones can), but again, I've never felt the need for one. The Chevy auto E-locker is pretty cool, but I've also heard they are pretty weak.