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Old 05-25-2010, 07:34 PM
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Locker Advice.

It appears that my rear locker is bad. I am in need of a new one.

Just wondering, should I replace it with a factory unit or go aftermarket? Lockers are something I don't know much about except that my Jeep came from the factory with them and I use them occasionally.

If I go aftermarket, should I go air or electric? Would an air locker work with my factory pump? Will any aftermarket locker work with my rear limited slip? What brands are better than others?

I am in need of good advice and a bit of an education here.


2003 Rubicon, completely stock rear end.
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Old 05-25-2010, 07:40 PM   #2

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Old 05-25-2010, 07:43 PM   #3
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Why do you think it is bad? What is it doing or not doing?
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Old 05-25-2010, 07:51 PM
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It will engage maybe one in five attempts. My mechanic took the cover off for a look and the little washers, for lack of a better term, some are missing and chewed up as debris and one spring is in bad shape.

Since I have the problem, I want it solved and never have to worry about it again. Not even sure how it failed, but it has. Just wondering what would be the best route to take.
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Old 05-25-2010, 07:52 PM   #5
Knows a couple things...

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X2, what is your rear locker doing or not doing? Whatever is wrong may be something that is simple and inexpensive to repair or replace.

Edit: Nevermind, you answered that while I was typing.

Beyond that, the Rubicon's Dana 44 axle is not a standard Dana 44 axle & most lockers designed for standard Dana 44 won't fit a Rubicon style Dana 44. They at least need some modifying, though ARB may make one that fits. The locker I would go with is an ARB Air Locker, especially since I believe you can get one of them working in a Rubicon axle.
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Old 05-25-2010, 08:42 PM   #6
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OK... somewhat on the same topic. I have an 05 with a Dana 44 but no limited slip or locker. I do mostly sand at the beach. I need to keep my speed up in soft sand. I would like to have one that works as a posi trac all the time with the ability to go to full lock if necessary.

I saw that Detroit made something called an electro something or other but can't find any info on their web site. Anyone know anything about that or another option?
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Old 05-25-2010, 09:42 PM   #7
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Your Rubi diff may be savable. Find someone familiar with them. If it's just the retaining washers and a spring you can get them from Jeep.

The killer is the dog clutches - they strip out and are not available as far as I know. Look real close inside - the dog clutches look like round metal sleeves with mating notches. The notches break off. Check in the bottom of the housing for pieces, they'll tell you what broke.

There was a combination limited slip with a locker made years ago - no longer in business. The Rubi system was essentially patterned after it. As far as I know nobody else makes anything with a limited slip and a locker. It's one or the other.

Last I checked, you can get the entire rear complete diff from Jeep for just over $2000.

If you go ARB, you'll need a high pressure compressor too - it needs at least 90 lbs. The Rubi is only 5-8lbs or so.

Possibly the reason you broke it was you activated the switch while it was under load - understandable in sand, but dangerous. The dash light flashes at first, indicating it's not fully engaged - easily breakable. Once it's on steady it's fully engaged and safe to apply power.
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Old 05-25-2010, 09:53 PM   #8

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If you have to replace vs. fix it, my vote would be ARBs. Install is key, but they work great. Loved the one's I had.
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Old 05-26-2010, 06:53 AM   #9
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If you have to replace get the ARB one, tons of people running them in their Rubi's with no issues. If you sign-up and look over on the RubiconOwnersForum, if the ROF flea market, there's been times where people are selling them cause they upgraded to the ARB one. I believe that Jeepsrus also carries them as well, if looking for the factory direct replacement and you can also check with Davies Jeeps out of Ohio, it's a Jeep salvage/parts yard

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Old 05-26-2010, 09:52 PM
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Thanks so much for the advice.

I inquired with my mechanic about fixing it and he said there are people who do it, but he is not one of them. He said they are very touchy and need to be absolutely correct. He is also looking for parts and putting feelers out for someone who rebuilds things like that. He is as particular as I am and hopefully will be able to find someone who can do this repair in their sleep.

In the event that does not pan out, which ARB would be the correct one for the Rubi rear end?

I also have an e-mail in to Davey's. I hope to hear back in a day or two.

I will look on ROF. Hopefully, I can have several options to choose from before I decide.

Thanks so much for the help!

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