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changin the diff fluids

Discussion in 'The Garage' started by NEK5, May 17, 2006.

  1. NEK5

    NEK5 3/4 ton status Premium Member

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    just want to get a general idea of the process as i`ve never done it before and plan on it tonight
     
  2. wraenking

    wraenking 1/2 ton status

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    drain fluid, refill to bottom of drain nut. easy as pie
     
  3. sled_dog

    sled_dog 1 ton status

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    Rear:
    Put a drain pan under the axle. Unbolt the diff cover. Usually I like to leave the upper most bolt in a few threads(so the cover doesn't fall into the drain pan). Use a screw driver or something and pry the cover away from the housing. Let it drain. Check the magnet(if there is one, should be in the bottom of the diff or on the cover) for debris and metal. Clean off any shavings, if there are big chunks, well look for damage on the internals. Clean the mounting surface off. Install the gasket on the cover or silicone on the cover or housing. Black or Grey will work(either is oil resistant). Install the cover. Remove the fill plug. It is on the pinion area on the front side of the axle. Look for a little plug that has a 3/8" square drive. Stick in a 3/8" extension and use a ratchet to remove it. Fill through the hole.

    Front:
    Same as the rear just the fill hole is on the cover.

    Sorry if this insults your intelligence with simplicity.
     
  4. 84zz4ss

    84zz4ss 1/2 ton status Premium Member

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    Remove fill plugs first. If they don't come out it will be very difficult to fill after you drain the diffs. Remove cover bolts. Remove cover. Light prying may be needed. Clean gasket surfaces on diff and cover. Reinstall covers with new gasket or sealer. Refill with your choice of gear oil to bottom of fill hole. Install fill plug. Cold beer may be needed between some (most) steps.
     
  5. K5Greek

    K5Greek 1/2 ton status

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    not to sound like a douche or anything but you should buy a haynes manual to help you out with alot of the basic maintnence on your truck.
     
  6. stockk5

    stockk5 1/2 ton status Premium Member

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    simply unbolt the diff cover, let the fluid pour out.. then get in there w/ a rag and clean out the old gunk, then put a bunch of rvt sealant on the diff. cover, and bolt it back in.. open the lil drain plug and re-fill till new fluid pours out. there ya go.
     
  7. NEK5

    NEK5 3/4 ton status Premium Member

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    should i get new gaskets or buy the liquid silicone stuff???and what gear oil should i get???
     
  8. NEK5

    NEK5 3/4 ton status Premium Member

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    so what do i tell my mom if she catches me?
     
  9. NEK5

    NEK5 3/4 ton status Premium Member

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    well i do have one, its just under a whole bunch of crap in the shed and i am REALY lazy

    didnt mean to make it seem like i wanted everyone to tell me everything, even the basics
     
  10. Janitorjim8

    Janitorjim8 1/2 ton status

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    Definitly need a Hayne's or Chilton's manual, they cover all this little stuff in depth.
     
  11. NEK5

    NEK5 3/4 ton status Premium Member

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    :D:D
     
  12. cbbr

    cbbr 1 ton status GMOTM Winner

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    Some use RTV, some a gasket. I use both - a thin coat of RTV and an OEM gasket. Most probably just use RTV.
     
  13. cbbr

    cbbr 1 ton status GMOTM Winner

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    That you were just following instructions......
     
  14. NEK5

    NEK5 3/4 ton status Premium Member

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    gear oil?
     
  15. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Go buy some brake cleaner(once can per diff). Once you've got the cover off and all the fluid drained out, use the entire can rinsing everything down inside the diff. After you're done, scoop out all the gunk that will have accumulated on the bottom and leave the cover off for at least a half an hour so that any left over brake cleaner has a chance to evaporate. When you're sure that everything is dry, button it back up and refill it as per everyone's directions.
     
  16. rick88blaze

    rick88blaze 1/2 ton status

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    X2 :D That's how I do it every single time. Brake cleaner is a life saver for cleaning up old oil and lubricants.

    Rick
     

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