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  1. #1

    Default Rear Differential Fluid Change.

    Changed the fluid in the rear differential. The amount of fluid that I removed was ~2.25 quarts, and the fluid I put back in was ~3.25 quarts. I put fluid in until it ran out the fill plug. I wonder why the difference?

    Used Mobil 1 75W-90 gear oil.

    2013 Silverado LTZ White Diamond Crew Cab


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  2. #2
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    Quote Originally Posted by stchman View Post
    Changed the fluid in the rear differential. The amount of fluid that I removed was ~2.25 quarts, and the fluid I put back in was ~3.25 quarts. I put fluid in until it ran out the fill plug. I wonder why the difference?

    Used Mobil 1 75W-90 gear oil.
    the 10.5 takes 3.25QT / 9.5 2.7QT .. now on filling with the vehicle LEVEL in warm weather fill to just below the fill hole. in cold weather fill to 1/2in below the fill hole. this fluid when hot expands.

    since you drained out A QT less then you must have a leak. check the fluid every oil change for level and fluid color.

  3. #3
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    Quote Originally Posted by j cat View Post
    since you drained out A QT less then you must have a leak. check the fluid every oil change for level and fluid color.

    Could be as simple as the position of the asymmetrical center section...turn it one way and it will displace more volume than if its turned 90*. Depending on its position when it was last filled...

    A leak on a differential should show up pretty readily. Even an ounce will make a complete mess underneath a truck; let alone a quart.

  4. #4
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    Quote Originally Posted by steved View Post
    Could be as simple as the position of the asymmetrical center section...turn it one way and it will displace more volume than if its turned 90*. Depending on its position when it was last filled...

    A leak on a differential should show up pretty readily. Even an ounce will make a complete mess underneath a truck; let alone a quart.
    there is a vent tube hose if it got very the fluid may have come out of it as another possible cause or maybe it was never filled to the proper level this can occur if the vehicle was not on level surface.

  5. #5
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    I want to say mine was "low" by my standards when I brought it home...it was around a 1/2 inch (or more) below the fill hole. I'm thinking they probably fill them by volume (automated, so to speak), and not by level...I fill this one to where the fluid runs out the fill hole.

  6. #6

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    Quote Originally Posted by j cat View Post
    the 10.5 takes 3.25QT / 9.5 2.7QT .. now on filling with the vehicle LEVEL in warm weather fill to just below the fill hole. in cold weather fill to 1/2in below the fill hole. this fluid when hot expands.

    since you drained out A QT less then you must have a leak. check the fluid every oil change for level and fluid color.
    My truck has the 8.6" ring gear. I have your standard 10 bolt G80 locking diff. There are no leaks on the axles, pinion or other areas. The truck is a 2013

    After reading a BUNCH of posts on other forums I gather the capacity of that particular diff is ~2.5 quarts. Many have said that the proper fill level is 0.5" below the fill plug.

    I filled the diff up until it came running out of the fill plug and waited for it to stop running out. Is this improper, I don't know, I've always filled gearboxes up until the fluid came running out of the fill plug.

    2013 Silverado LTZ White Diamond Crew Cab


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  7. #7
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    I have a 10.5", and I want to remember the 10.5" is "level with the fill hole"; but I do know it depends on the differential.

  8. #8

    Default

    Quote Originally Posted by steved View Post
    I have a 10.5", and I want to remember the 10.5" is "level with the fill hole"; but I do know it depends on the differential.
    You must have a 2500 Silverado.

    I was under the impression that the 2500 and 3500 rear differentials were made by Dana while the 1500 diffs were made by Eaton.

    2013 Silverado LTZ White Diamond Crew Cab


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    Chrome Tailgate Handle Cover
    TonnoPro HF-155 Tonneau Cover
    WeatherTech Front and Rear Splash Guards
    Husky Liners X-Act Contour Floor Liners
    WeatherTech Side Window Deflectors

  9. #9
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    Quote Originally Posted by stchman View Post
    You must have a 2500 Silverado.

    I was under the impression that the 2500 and 3500 rear differentials were made by Dana while the 1500 diffs were made by Eaton.

    The only Dana I know that GM used in a rear application was the Dana 60 in some of the 3/4 ton vans a while back. Until they switched to IFS, they used the D44 (later replaced by the Corp 10-bolt) and D60 for the front axle.

    This 10.5 is what i know as a "Corporate 14-bolt", and its design has been in use by GM since the late 60s/early 70s.

  10. #10

    Default

    Before this thread gets too far off topic:

    I would like the opinion of some of the forum members as do they think that filling G80 8.6" differential on a 2013 SIlverado up to the fill plug is bad, good, does not matter?

    Thanks.

    2013 Silverado LTZ White Diamond Crew Cab


    Mods:
    Advent OGM1 Navigation
    Husky Liners GearBox Underseat Storage
    Airaid MIT
    EGR Rail Caps
    K&N Air Filter
    Flowsound 40 Muffler
    Hypertech Max Energy Tune (only top end limiter removed and AFM disabled)
    Chrome Tailgate Handle Cover
    TonnoPro HF-155 Tonneau Cover
    WeatherTech Front and Rear Splash Guards
    Husky Liners X-Act Contour Floor Liners
    WeatherTech Side Window Deflectors

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