LMM Front Diff leaking, Seal Kit? - Chevy and GMC Duramax Diesel Forum
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Old 12-06-2012, 03:24 PM   eBay Motors  #1 (permalink)
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LMM Front Diff leaking, Seal Kit?

need to reseal my entire front diff, is there anything special I should know about removing it or is there any special seal kit/gaskets I will need beforehand, or is it all just siliconed together. Any help would be great thanks.
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Old 12-07-2012, 05:14 AM   eBay Motors  #2 (permalink)
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Should just be RTV'd on there. Make sure its not just a fill or drain plug loose.
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Old 12-07-2012, 10:22 PM   eBay Motors  #3 (permalink)
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Anyone with any experience pulling one of these apart? Would like to hear something better than a should be, anyone? Definitely leaking at pumpkin half and then some, long story...
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08 LMM 2500HD C/C 4wd Short Bed Diamond Eye 4" straight pipe turbo back Edge CTS Race EGR Blocked PCV Reroute Debadged HID/LED all around
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Old 12-07-2012, 10:48 PM   eBay Motors  #4 (permalink)
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Is it leaking where the diff splits or at the seals?
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Old 12-07-2012, 11:26 PM   eBay Motors  #5 (permalink)
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Its leaking at two pumkin halves, right down the center and also at the shaft where the electronics hook into the pumpkin
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Old 12-07-2012, 11:35 PM   eBay Motors  #6 (permalink)
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Good luck. My 08 lmm would leak every time it got cold. Took it to the dealer 5-6 times and it wasn't until 2011 when I blew the dif and the dealer replaced it did it quit leaking.
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Old 12-07-2012, 11:57 PM   eBay Motors  #7 (permalink)
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Sub'd for any info. Mines doing the same.
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Old 12-07-2012, 11:58 PM   eBay Motors  #8 (permalink)
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Why i want to take care of it right the first time, wierd that it would leak when it got cold though, mines the other way around. The oil gets thinner in the summer and leaks out quicker than in the winter when its thicker.
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Old 12-08-2012, 12:02 AM   eBay Motors  #9 (permalink)
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First time hearing about it leaking randomly though, long story short, drove very far distance in 4wd, oops, blew oil out the breather tube and cooked all seals, hence now leaking in a few spots so i need a complete resealing. Still hope someone has had one of these diffs apart here?
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Old 12-08-2012, 05:24 AM   eBay Motors  #10 (permalink)
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Quote:
Originally Posted by Draz View Post
need to reseal my entire front diff, is there anything special I should know about removing it or is there any special seal kit/gaskets I will need beforehand, or is it all just siliconed together. Any help would be great thanks.

Yes, they are just siliconed together and the key to having it be successful is twofold. First make sure the surfaces are completely free of any oil or other debris (brake cleaner, then dry well). Second make sure the breather tube has no obstructions and flows freely. I would also suggest replacing the axle seals while you're in there since they will be easy to access at that point. I would use an aerosol silicone sealer called 'the right stuff' (Permatex Ultra Black and Ultra Gray are also good alternatives) as it does a great job sealing. Keep in mind a little goes a long way and to always make sure the silicone gets applied towards the inside of the bolt holes.
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