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Lube oil for Fuller 8LL transmission?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Bigfoot62, Nov 23, 2011.

  1. Nov 23, 2011 #1
    Bigfoot62

    Bigfoot62 Light Load Member

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    Oct 29, 2011
    Louisiana
    0
    Changing the oil in a Eaton/Fuller 8LL transmission. ('95 KW T800 truck)
    I just got this truck, and there is no manual. I was planning to use 75w-90 synthetic. Is that OK? Anything better?
    Thanks.
     
    Bigfoot62, Nov 23, 2011
    Bigfoot62, Nov 23, 2011
    #1
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  3. Nov 23, 2011 #2
    kwforage

    kwforage Road Train Member

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    Jun 3, 2007
    Wisconsin
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    I think most people use 50w. I use 80-90 in mine. I prefer the heavier weight in mine since it's an off road truck and used only in warm weather.
     
    kwforage, Nov 23, 2011
    kwforage, Nov 23, 2011
    #2
  4. Nov 24, 2011 #3
    Cowpie1

    Cowpie1 Road Train Member

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    Kellogg, IA
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    Go to roadranger.com and download Eaton's lube manual for your tranny.
     
    Cowpie1, Nov 24, 2011
    Cowpie1, Nov 24, 2011
    #3
  5. Nov 24, 2011 #4
    The Gryphon

    The Gryphon Heavy Load Member

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    Nov 3, 2011
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    Better still, contact an AMSOIL dealer and put really good stuff in it. PM me if you want a referral to one. They can tell you what and how much you need and help you get it.
     
    The Gryphon, Nov 24, 2011
    The Gryphon, Nov 24, 2011
    #4
  7. Nov 24, 2011 #5
    thehammer69

    thehammer69 Light Load Member

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    Oct 31, 2008
    Goose Creek, SC
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    the 50 weight rating of transmission oil is a different scale than the gear oil rating that is used in our differentials. Basically the 50 weight transmission oil use the same SAE scale that engine oil uses...which is different from SAE scale of gear oil. If you look at the product data sheets published by the lube makers, there should be a specification comparing each's viscosity using the same viscosity scale. You will discover that they are close to identical in viscosity.

    Check out this chart and it will be clearer:
    http://www.bobistheoilguy.com/viscosity-charts/
     
    thehammer69, Nov 24, 2011
    thehammer69, Nov 24, 2011
    #5
  8. Nov 25, 2011 #6
    Bigfoot62

    Bigfoot62 Light Load Member

    92
    29
    Oct 29, 2011
    Louisiana
    0
    Thanks for all your help.

    I'll try to find a bucket of the 50w on Monday.
     
    Bigfoot62, Nov 25, 2011
    Bigfoot62, Nov 25, 2011
    #6
  9. Nov 25, 2011 #7
    Bigfoot62

    Bigfoot62 Light Load Member

    92
    29
    Oct 29, 2011
    Louisiana
    0
    duplicate post deleted
     
    Last edited: Nov 25, 2011
    Bigfoot62, Nov 25, 2011
    Bigfoot62, Nov 25, 2011
    #7
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