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GEAR LUBE???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 87chvy4x4, Nov 26, 2000.

  1. 87chvy4x4

    87chvy4x4 Registered Member

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    What kind of gear lube r yall running in your rear ends and front ends 90wt 140 wt?? what kind? i have ten bolts front and rear if that makes a difference im planning on changing the lube cuase it hasnt been changed since ive had the truck so i need to know what kind and weight to get

    CaLeB
    RiVeR cItY oFfRoAd
    http://caleb.coloradok5.com
     
  2. BlazerGuy

    BlazerGuy 3/4 ton status

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    I use Valvoline 90wt. I think 140 would lower gas mileage

    [​IMG]
    [​IMG]FUN WITH 31's![​IMG]
     
  3. riz

    riz 3/4 ton status

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    <font color=purple>Doesn't it depend on what year you have ? Am I thinking the right thing ? I thought some years used Automatic Tranny Fluid ? Please correct me if I'm thinking of something else ?</font color=purple>

    <font color=purple>L8r,

    .Riz.<font color=purple>
     
  4. BlazerGuy

    BlazerGuy 3/4 ton status

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    Your thinking of the t-case. 205-gear oil, 203-motor oil, 208-tranny fliud. Diffs use gear oil, 80wt, 90wt etc

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    [​IMG]FUN WITH 31's![​IMG]
     
  5. riz

    riz 3/4 ton status

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    <font color=purple>Yup, that's it. I guess I should change the fluid in both since I can't remember that, then it must have been some time ago. Thanks for the clarification and corresponding chart.</font color=purple>

    <font color=purple>L8r,

    .Riz.<font color=purple>
     
  6. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    So with all the diiferent choices of fluid weights, which one offers the best all-round protection/performance? And what about going to a synthetic gear oil? I've heard that doing this can increase mileage.........
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I use 80w90wGL5 gear lube. Thats what my Chiltons book recommends and it seems to work fine. I haven't heard much about synthetics though.

    Rene

    [​IMG]
     
  8. Goose

    Goose 1/2 ton status

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    Same as tRusty...Dana44 and 12bolt tho'

    Fencepost eater
     
  9. 90K5

    90K5 1/2 ton status

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    I used 80w-90 with no LSD additive and its fine.

    90K5
     
  10. Thunder

    Thunder 3/4 ton status

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    I'v been using synthetic 90wt in my diffs for some time now. Pulled the cover off the rear a few weeks ago and could see no wear and all looked nice and clean. I use my K5 pretty hard, 4 wheeling a lot, towing long distance, every day and hi speed driving. I like synthetic oils and believe they are worth the extra money.
     
  11. jarheadk5

    jarheadk5 1/2 ton status

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    I <font color=blue>think<font color=black> a synthetic gear oil would be advantageous if you rack up the highway miles quite a bit. For an off-road beater that should be having fairly frequent changes, a good conventional is probably fine. Much less expensive that way.
    Unless you're in a really hot climate, I'd stick with 80-90wt.

    [​IMG] Semper Maintenance!
     
  12. Cavalry

    Cavalry 1/2 ton status

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    Ever try to fill a diff on a really cold day? Its like pumping cement in there. Go full syn Much nicer in the cold IMO.
     
  13. Pookster

    Pookster 1/2 ton status

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    I changed my rear gear oil two weeks ago. I switched to Synthetic. I think its well worth the extra cost (About 7 dollars a bottle). I used Mobil one , which I think was a 75-90, or something similiar to that. THey only make one weight. Anyways, the goop that was in there was kinda nasty, flowed more like molasses than gear oil. I did it when it was about 40-45 degrees outside. Three bottles and 1 LSD addititive. I've been told it isn't necessary by mobil, but I just wanted to get it all in at once and not worry about it for a year or two. So far, no problems.
     

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