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What the heck was in my diff?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Can Can, Mar 31, 2001.

  1. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    I replaced the 80/90w in my rear diff today. I hadn't done it for a couple of years and couldn't BELIEVE the slop that was pouring out of there. It looked like a chocolate milkshake, all frothy and brown. I managed to clean the inside up pretty well with the help of a can of Brake-Kleen, and everything looked good- no wear and very little shavings on the magnet. Does anybody know why the fluid looked so ugly? I don't run in the mud, and can't remember the last time I had water up past the axles..............


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  2. Twiz

    Twiz 1/2 ton status

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    Water mixed with 80/90, Water gets everywhere!

    Twiztid
     
  3. 90K5

    90K5 1/2 ton status

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    Is the vent hose still there?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  4. Pure Insanity

    Pure Insanity 1/2 ton status

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    POSSIBLY condensation if you dont bog or cross water.consider your self lucky the last time i pulled a diff cover the pinion seal went bad and toasted the diff(things get real ugly real fast w/ no oil)all i got out was ground up diff in what used to be a little oil left in there and big chunks of ring&pinion.was a good excuse to upgrade tho.

    PURE INSANITY
    86 blazer silverado 400 horse 350 w/vortec heads 38 x15.5 swampers (40 hawgs next)10 bolts(blah)w/4:88s coming soon,14 bolt.
     
  5. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    The vent hose is still hooked up and the breather cap is still in place...............Could water be finding it's way in somewhere else?



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  6. Twiz

    Twiz 1/2 ton status

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    Everywhere else, that stuff is almost unstopable! If you put your hot axle in the drink and it cools off faster than the vent can can breath then it will suck some water or air in from somewhere. Not a big deal if you keep a eye on it. I pulled the same milk shake out of my diff too and haven't done a water crossing since the last time I changed it, have no idea where it came from, but it was there. Check the the vent tube, the breather cap could be gummed up and clogged. A check the axle seals (while your there check the shafts for a groove)

    Twiztid
     
  7. 4GUNZ4X4Z

    4GUNZ4X4Z 1/2 ton status

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    If your vent tubes are up high, then it's probably your axle seals.

    <font color=blue>Professional <font color=red>JEEP EATER</font color=red> it's a population control thing.</font color=blue>[​IMG]
     
  8. Pure Insanity

    Pure Insanity 1/2 ton status

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    if you dont cross water,or bog,your vent tubes are in tact,its prob condensation.think of a can of pop,the outside gets wet,becuz its cold in there,but its hot on the outside,just w/ a diff its inside out.hot inside cold outside,esp.if your up north. you dont see the condensation like a can,cuz,its inside.if your axle seals were bad,most likely youd find oil in your brake drums.water will go everywhere if given the chance.if theres no chance,its prob condensation.IMO.does anyone else agree????

    PURE INSANITY
    86 blazer silverado 400 horse 350 w/vortec heads 38 x15.5 swampers (40 hawgs next)10 bolts(blah)w/4:88s coming soon,14 bolt.
     
  9. taterblazer

    taterblazer 1/2 ton status

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    Just swap your diff oil occasionally.
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    I'd have to agree, thats just normal. Nothing to worry about.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  11. Emmettology 101

    Emmettology 101 3/4 ton status

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    Ya, it could be going past your axle seals or you may have a hole in your vent line.

    I pulled the plug out of mine once and that milky brown stuff came shooting out at me!

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>

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