How to: Change diff fluid

Discussion in 'Powertrain & Driveline Tech' started by smokewagon, Jul 17, 2012.

  1. smokewagon

    smokewagon New Member

    Messages:
    3
    OK so might be a dumb question, but i was wondering what is the proper way to change diff fluid; and what is the right fluid to use?
     
  2. Jared

    Jared Administrator Staff Member

    Messages:
    20,562
    what vehicle?

    75/90 synthetic on my truck, just bought today
     
  3. smokewagon

    smokewagon New Member

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    3
    on a 00" silverado and a 12" silverado, but mostly in general i always wonder when i do some of the simpilist tasks if im actually doing it right or is there a better or "right way" to do it
     
  4. Adjusted

    Adjusted Super Moderator

    Messages:
    3,618
    first off, welcome!

    second off, what year/model vehicle?

    third off, the basic steps are; drain the fluid through the drain plug if you have one - then follow the next few steps, then unbolt the diff case cover (sometimes you will have to pry it off just a tad once the bolts are all removed) and drain it all or what is leftover after draining through the drain plug. While the diff is draining; clean the cover itself and the magnet on the cover you just removed with some brake cleaner, it will have small metal shavings attached that are normal (if you see any large chunks you should be alarmed). Spray cleaner inside the case and wipe out any remaining fluid. Depending on what vehicle you have you may or may not have a cork/paper gasket that must be scraped off - remove what you can by hand, then scrape the remains off of the cover and case with a razor/scraper. If you have a re-usable metal style gasket just set it aside while you are finishing cleaning the diff. Once everything is clean - replace the gasket, making sure it is flush and in the correct position on the diff case, then bolt the cover back on. When bolting the cover back on be sure to start the bolts by hand, and tighten the bolts down in a star-pattern. Open the fill-plug on the side/cover of the diff case and fill the diff up until it starts to overflow - then re-insert the plug and tighten it down. Re-check everything is tight and you are good to go! That is a general way to do it - pretty easy, but it gets stinky...
     
    Last edited: Jul 17, 2012
  5. Adjusted

    Adjusted Super Moderator

    Messages:
    3,618
    both of these vehicles take 75w90 synthetic gear fluid. follow my post above and you should be good, the right way is the only way - the 2012 likely has a re-usable gasket, the 2000 does not.
     
    Last edited: Jul 17, 2012
  6. smokewagon

    smokewagon New Member

    Messages:
    3
    thanks adjusted, seems like i do have a handle on it, your write is pretty much the same way i have done it before but that was on my old 80" chevy scottsdale i think i got a lil more confidence for my 00" silverado
     
  7. Jared

    Jared Administrator Staff Member

    Messages:
    20,562
    you can also get a pump like what is used on boats lower units to fill if you want...might make it easier and cleaner
     
  8. Jared

    Jared Administrator Staff Member

    Messages:
    20,562
  9. Cleanoh4

    Cleanoh4 Well-Known Member

    Messages:
    4,325
    Major thread dig, but was looking for something else.

    I noticed it wasn't mentioned, and likely common knowledge, but, you should always remove the fill plug first, when it comes to Rear Diffs, Front Diffs , and Tcases.
     
  10. slicksierra

    slicksierra Feel some type of way

    Messages:
    5,453
    Subd need to do this


    Sent from my iPhone using Tapatalk
     

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