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What’s the DIFF GM? ARB doesn’t know!


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So I’m trying to build a trustworthy 4 wheel drive with Selectable Lockers in the front and back. Have a 2011 Silverado 2500 HD LML LTZ Duramax. Last 8 on VIN: BF192149. I choose ARB lockers for their reputation and because they could provide lockers for Front and Back Diff’s and because Eaton claimed to have front lockers but had no intention of developing a selectable rear locker. 4 wheel Parts is my builder. I spoke to ARB before ordering and it was confirmed they had the product to deliver my desire for lockers. The rear lockers were installed and when the front were being installed it was not possible. 4Wheel looked for support and ARB support said this: “Our engineers have never seen one of these and we’re trying to figure out exactly what GM did here.” They are at a loss right now, but they did say they are “not sure how our locker would work with that type of diff because the air collar that engages the locker works off of the side bearings.” Now ARB claims they will update their website to inform others with my same intentions and they also claim that they have installed front lockers on 2011 Silverado 2500 HD’s before. It would help me to decide on how to proceed if I too knew what GM has done to the front differential on this truck. Can anyone help to explain this differential.

 

http://imageshack.us/photo/my-images/37/004ral.jpg

http://imageshack.us/photo/my-images/268/007kbt.jpg

 

http://imageshack.us/photo/my-images/651/001dfg.jpg

http://imageshack.us/photo/my-images/839/003nrj.jpg

 

http://imageshack.us/photo/my-images/528/006em.jpg

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What would you like to have explained to you? The fact of the matter is, ARB doesn't make a locker for this differential. The differential case side bearings are of a completely different design that your right, isn't going to allow you to put an air collar on the differential case. Sounds like ARB has to go back to the drawing board to find a new way to do it. AAM (the company that makes GM and Chrysler's axle assemblies for them) obviously found a more robust way to support the differential case in the housing. Unfortunantly, that leaves someone like yourself, back on the hunt for a locker option for the front axle of your truck. I have been out of the aftermarket 4WD scene for a few years but last I knew, no one made an aftermarket differential for GM IFS trucks. I certainly, from years of experiance working on them, would NOT "lock up" an GM IFS front axle. The strength just isn't there. Left open they do just fine even under heavy loads and working conditions but if you locked one up I don't see that happening, imo.

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Thanks ChevyTech77, Is it open? Is it limited slip? Does it work like a posi? Does it work like a G80 (gov locker) How does it work? I am going to get into some sand and mud and it would be nice to have a locker in the front just in case I need it. Just another tool to get me out.

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Just keep working on em. It could take a while, as most people agree with the above, and don't want a locker on IFS front. I think you should try it with just the rear locked up, and see how that works for you. You might be happy with just the rear.

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Thanks Kstruckcountry, I might test it out. But it's lock your rear and if that doesn't work then lock the front.

 

Hi oldschool327, Eaton also thought they had a locker for it until they saw the photos. Then they did a 180 and said no can do.

 

 

 

 

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The issue with the front locker is once locked, steering is almost non-existant. So nobody (except the hard core 4x4 guys) buy them.

 

My guess is volumes are so low on front lockers, that it isn't worth their time working on one (could be that coupled with the GM front axles not meant for that kind of strain. They are pretty small in diameter. If you hook up one wheel, they're bound to snap).

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