Rear Differential

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by DJJ, Dec 8, 2013.

  1. DJJ

    DJJ New Member

    I have an '08 1500 Silverado. The rear end in leaking oil and I would like to know if using RTV when putting Amsoil in it is a problem.

  2. zippstripp

    zippstripp Member 1 Year

    If all your doing is sealing the cover back on there shouldn't be any problem.
  3. j cat

    j cat Epic Member 5+ Years 1000 Posts

    the use of synthetic gear oils with silicone sealers has been reported as a problem. over time it eat at the silicone.

    I use a gasket with permatex form a gasket on all my gaskets. use mineral spirits to clean off all oil.
  4. Cowpie

    Cowpie Rockstar 3 Years 500 Posts

    You want the ultimate solution... Lube Locker gaskets. Go on dry and reusable. No RTV. No sealer.
  5. stchman

    stchman Active Member 2 Years 1000 Posts

    To [MENTION=52023]DJJ[/MENTION] :

    I am assuming that your rear differential cover gasket is leaking. If yes, then simply remove the cover and put on a new gasket. I recommend using the OEM gasket.

    If your truck has the standard GM 10 bolt 8.6" ring gear, the OEM gasket is GM part number 15860607.

    Make sure you clean the gasket mating surface on the differential and cover very well. The OEM gasket has built in rubber sealing rings so it makes a great seal. No silicone or RTV is required.

    Here is one on ebay for $21 shipped:
  6. TRPLXL2

    TRPLXL2 Epic Member 5+ Years 1000 Posts

    [MENTION=61344]Cowpie[/MENTION]. I checked out those lube locker gaskets, and those are pretty sweet. They are the same price as the factory gasket $21.00, I'm going to have to try one of those. Thanks for the post!
  7. stchman

    stchman Active Member 2 Years 1000 Posts

    When it comes to gaskets, it has been my experience that OEM gaskets work FAR better than aftermarket. The only thing is that OEM gaskets usually come at a price premium. In this case OEM and aftermarket are identical in price, why take a chance?
  8. Cowpie

    Cowpie Rockstar 3 Years 500 Posts

    No doubt the OEM works fine, but Lube Lockers are the defacto standard among the serious 4x4 crowd. Especially the Jeep crowd. I have used them for years. I have re-used them up to 3 times with no leaks. You have to see one of the Lube Lockers up close and see the quality. I have compared the stock OEM gasket on my 2013 Silverado to the Lube Locker I put on when I changed out the factory fill at around 3000 miles on the odometer. The stock one is good, but I felt a lot more confident with the Lube Locker. As one who has spent a few decades hauling automotive parts for OEM assembly lines, just because it is OEM does not make it the best. Just like the government, they set the specs and take the lowest bid. GM, Dana, or any other OEM is not making their own gaskets. That is a third party source item. Another way to say that is.... the OEM gaskets ARE aftermarket gaskets. These days of auto manufacturing are not the same as they were 40 years ago. Lear makes seats, headliners, and even engine valves for Ford. American Yazaki (a Japanese company in Mexico) makes all the wiring harnesses for GM vehicles, Hayes Lemerz is the primary supplier of auto/pickup OEM wheels in America, and the list goes on and on. A large portion of any vehicle rolling off the assembly line is comprised of third party made parts.
    Last edited: Dec 14, 2013
  9. j cat

    j cat Epic Member 5+ Years 1000 Posts

    not working these newer gm vehicles why is it this is an issue now ?

    I have never had these leaks with my vehicles and I replace the gear oil with cover removal every time . I also use the same gasket 3X now on the 2000 silverado. I use the felpro gasket its 5.00 usd.

    gm making this DIFF cover of very thin metal ? that would do it .

    I did see that these diff cover gaskets for the 2008 are of metal and rubber composition . must be because of the thin cover or poor carrier housing machining .

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