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  1. #1

    Exclamation Need help changing rear diff fluid.

    I have a 2000 Chevy 1500. I'm not sure what one is the drain and fill plug. there's one that is on the diff cover and one that is near my driveshaft. The one near my drive shaft wont come out so im hoping this isn't my fill plug|???? also what kind of diff fluid should I use in a 2000 chevy Silverado with high milage.

  2. #2

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    Quote Originally Posted by Outlaw19 View Post
    I have a 2000 Chevy 1500. I'm not sure what one is the drain and fill plug. there's one that is on the diff cover and one that is near my driveshaft. The one near my drive shaft wont come out so im hoping this isn't my fill plug|???? also what kind of diff fluid should I use in a 2000 chevy Silverado with high milage.
    In the Diagram, Number #37 is the Drain Plug....Number #38 is the Fill Plug, and Number #39 is the Connector for a Vent Hose .....and you want to go with 75/90 Gear Lube....make sure to Clean the Cover before Re-Installing it....I'm running with 75/90 Gear Lube from Royal Purple in my Rear Diff.





    Edit:....I would also add, if you have RPO Code G80 ...........The use of any Additive in Locking Rear Axles (G80) is Not Recommended. Rear Axle Additives are designed for use in Limited Slip Differentials which are normally installed in cars. All Light Duty Trucks Equipped with RPO G80 make use of a Locking Differential and the use of Additives will Delay the Engagement of the Locking Mechanism and May Decrease Axle Life.

    ***You'll need to Buy 3-Quarts of Gear Lube, as your Rear Diff takes 2.15 Quarts to Fill.
    Last edited by 99'HEARTBEAT; 02-05-2014 at 09:17 AM. Reason: Added Infor.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  3. #3

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    also do not drain if the fill plug wont come loose. Always loosen the fill plug first.
    David
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
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  5. #4

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    What the guys above have said is all good; however (ya just knew I was going say that, haha), if there is a plug in the rear cover, and it is in the middle, or higher, of the cover, you can use that (if it's below the middle, it might be an additional drain plug). I suspect it is a fill plug.

    That is probably an after market diff cover and it is designed to be removed for lub changes and has the plug for filling.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  6. #5

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    Click image for larger version. 

Name:	rear diff.jpg 
Views:	16 
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ID:	57567Heres a picture of what my rear plug looks like. Is this a fill port or drain plug.

  7. #6

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    That is a fill plug. Look at the very bottom of the housing you will probably find another plug. That will be your drain plug. If there is no plug there, you will have to remove the cover to drain the fluid.

    97 Chevrolet Suburban K1500 5.7L
    78 GMC High Sierra K1500
    Fat, drunk, and stupid is no way to go thru life.

  8. #7

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    I found the drain plug underneath. So are you sure that the plug in the centre is my fill plug?

  9. #8

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    Quote Originally Posted by Outlaw19 View Post
    I found the drain plug underneath. So are you sure that the plug in the centre is my fill plug?
    x2...on that being the Fill Plug in the Picture you've posted, also some Rear Diff's don't have a Fill Plug on the Cover.....its located on the side of the Diff.....Number #38 in the Diagram.

    Also this Video shows where the Fill Plug is located, if there's not one on the Diff Cover.


    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  10. #9

    Default

    positive. you should be able to put your finger through that hole, and the fluid should be close to where that bolt sits, thats how you know you're full.

    the lower bolt is for draining the fluid out.

    Things to look at:

    1: Make sure you can get the fill plug out first. (to make sure you can fill it after you drain the fluid)
    2: Drain fluid and inspect for metal shavings.
    3: Unbolt cover and clean old fluid off.
    4: Inspect rear end gears for wear.
    2012 Chevy Captiva Sport LT V6 (The Spanish Prison)

    MODS:

    Cobra 19 Ultra II CB and some generic CB antenna.
    55W 10000K HID High Beams (just to remind the wonderful citizens of Hampton that their High Beams are on)

    Upcoming mods:

    [_] Exhaust [_]Subwoofers [_]More HID's [_]LED's [_]MORE LIGHTS!!! [_]Carr Light Bar w/ 3 or 4 in round off-road lights. [_]Black out Badges [_]Black out exhaust tips [_]Black out imitation skid plates on front and rear [_]Hopefully find a way to keep fogs, low beams, and high beams on at the same time

    Jason

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