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Thread: Front/Rear Differential D.I.Y.

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  1. #1
    2007 Suburban 1500 LT jeffcolburn's Avatar
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    Front/Rear Differential D.I.Y.

    Could someone please explain to me how to change the front and rear differential fluid in my 1999 GMC Suburban 1500 4x4?

    The local shop says the see some shavings in there, and want a couple hundred dollars to fix it, but I was hoping I could do it myself to save a few bucks. Can/should I do this myself?:hack:Any info would help, THANKS!!

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    Registered User jebx's Avatar
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    Re: Front/Rear Differential D.I.Y.

    Changing the fluid is simple, repairing the diff isn't quite so simple. What are you trying to accomplish? Your post isn't very clear; you ask how to change the fluid, but then go on to say that there are metal shavings and the shop needs to repair it. What exactly is the problem?

    This thread may provide some insight as far as changing the fluid goes. Do a search and you will find tons of info already posted. Also, get a service manual or go to the local public library and copy the pertinent pages out of their service manual or print the info off alldata dependng on what they have.

    2001 RCLB Silverado 4x4 4.8L - Dynomax cat back - K&N FIPK

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    Re: Front/Rear Differential D.I.Y.

    There may be some fine metal in your oil, just like in your tranny oil. That isn't usually an indicator of a problem.

    How old is the truck? When was the last time the diff oil was changed? Is it the original gear set? How much abuse has the truck seen?

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    2007 Suburban 1500 LT jeffcolburn's Avatar
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    Re: Front/Rear Differential D.I.Y.

    Actually, I do just want to replace the fluid. You're right, I wasn't that clear. The shop wanted to charge me almost $200 just to replace the fluid. I will check out that other thread.

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    2007 Suburban 1500 LT jeffcolburn's Avatar
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    Re: Front/Rear Differential D.I.Y.

    The truck is only a '99, and I just bought it in January, so I really don't know if it has ever been changed. I don't pull anything with it, I just drive it. I don't think there is any physical damage, but I want to replace the fluid before anything doea happen.

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    Re: Front/Rear Differential D.I.Y.

    Throw some synthetic fluid in there and you'll be all set for years..

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    Registered User jebx's Avatar
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    Re: Front/Rear Differential D.I.Y.

    The rear is easy, just pull the cover, inspect, replace gasket (or use RTV), install, removel fill plug, fill, done.

    The front has a drain plug and a fill plug.

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    Registered User jebx's Avatar
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    Re: Front/Rear Differential D.I.Y.

    I'd reccomend you change the transfer case fluid too. If it's auto trak there is a special fluid for it available from GM. Otherwise, the standard manual shift takes ATF.

    Really, it probably isn't a bad idea to do them all, antifreeze, ATF, etc. Not very expensive for a little insurance.

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    Registered User TSPOON's Avatar
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    Re: Front/Rear Differential D.I.Y.

    I do not know if this is allowed on this site
    but i have a detailed desription on all the above
    fluid changes off another site i will post them
    if it will be ok
    someone let me know

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    2007 Suburban 1500 LT jeffcolburn's Avatar
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    Re: Front/Rear Differential D.I.Y.

    I've seen people post links on this site before. I think everyone likes anything that helps. (thank you by the way)

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    2007 Suburban 1500 LT jeffcolburn's Avatar
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    Re: Front/Rear Differential D.I.Y.

    Dude, thank you for your help, those links are all I needed, THANK YOU!!

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    Registered User jebx's Avatar
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    Re: Front/Rear Differential D.I.Y.

    BTW, that is on a NBS truck, the OBS rear doesn't have a drain plug that the article mentions.

    2001 RCLB Silverado 4x4 4.8L - Dynomax cat back - K&N FIPK

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    2007 Suburban 1500 LT jeffcolburn's Avatar
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    Re: Front/Rear Differential D.I.Y.

    Then how do you drain the oil from the rear in an OBS truck?

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    Re: Front/Rear Differential D.I.Y.

    Take off the cover...

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    Re: Front/Rear Differential D.I.Y.

    Don't forget to scrape off the old gasket and put a new one on.

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    Re: Front/Rear Differential D.I.Y.

    Quote Originally Posted by jeffcolburn
    Then how do you drain the oil from the rear in an OBS truck?
    umm heres your sign



    lol sorry had to be done.

    http://www.gm-trucks.com/images/Guid...front_diff.jpg is the bolt hole thats on top the fill hole for a 98 gmc z-71?? the stealership said that the filler was on the top of the other side but i aint seeing it.
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    Re: Front/Rear Differential D.I.Y.

    Quote Originally Posted by jeffcolburn
    Could someone please explain to me how to change the front and rear differential fluid in my 1999 GMC Suburban 1500 4x4?

    The local shop says the see some shavings in there, and want a couple hundred dollars to fix it, but I was hoping I could do it myself to save a few bucks. Can/should I do this myself?:hack:Any info would help, THANKS!!

    Resurrecting an old post .. I just had the fluids changed on my 02 Tahoe Z71. MEtal shavings -- more than what is acceptable were found in my front differential fluid. What I was told is the carrier bearings are starting to wear and need to be replaced. This is a huge job on the front diff. BEfore you just dump fluid in .. make sure the shavings/particles are within normal tolerance limits

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