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Im fixing to do a complete rear brake overhaul on my 2008 3500 dually this weekend. Ive read on previous threads that the older trucks use the 6 point specialty socket, does the 2008 use the same socket or a large standard 6/12 point? For some reason im thinking its a 36mm? Thanks!
I know this answer is many years to late, however for people reading this thread now, this answer should be of some benefit: You don't need any socket of any type to remove the axle nut, all you need is a screwdriver and perhaps a few light taps with a hammer to remove it (the installed torque of the nut is 0 FT-LBS as per the GM shop manual). In fact you don't even need a socket and torque wrench to adjust the bearing to the EXACT factory spec, again all you need is a screwdriver and a few light taps with a hammer. I have made a video that proves this empirically. In the video I adjust one wheel with the factory procedure using a torque wrench and 2-5/8" 6 pin socket and mark the final key way position. Then I loosen the axle nut and pull back on the hub to totally eliminate the adjustment and and adjust the bearing with just a screwdriver and a few light taps with a hammer. Both procedures come to the same mark. And just to prove reliability (and you don't need 52 FT LBS to seat the inner seal or roller bearings) I repeat the procedure on the other side except I use the screwdriver technique first and again come to exactly the same mark. Here is a link to the video;
 
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