Transmission oil / differential oil

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jhncp, Feb 27, 2020.

  1. Jhncp

    Jhncp Bobtail Member

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    From what I found out a 2010 transtar with 10 sp. Eaton Fuller is recommended to have chevron sae 40 synthetic transmission oil, used to be sae 50. For the rear differentials I just have some conventional 80w90 I was going to use just to fill to correct level. Sound about right?
     
  2. 062

    062 Road Train Member

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    @Heavyd can tell you for sure. I prefer synthetic all the way around.
     
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  3. Heavyd

    Heavyd Road Train Member

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    SAR, Jhncp, ODR and 3 others Thank this.
  4. Jhncp

    Jhncp Bobtail Member

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    There is a disc attached to each plate. So 75w90 synthetic?
     
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  5. Heavyd

    Heavyd Road Train Member

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    Yes, that's right.
     
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  6. jamespmack

    jamespmack Road Train Member

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    Those discs do fall off. And second not mixing the oils. Just spend the money and put in what it uses.
     
  7. Jhncp

    Jhncp Bobtail Member

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    Where can I buy just a quart or a gallon of 40 or 50 synthetic transmission oil? I'm just starting and poor so can't afford $200 for a 5 gal pail lol
     
  8. 062

    062 Road Train Member

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    Easiest way would be a local shop. I know all the parts stores around here only sell by the bucket.
     
  9. Jhncp

    Jhncp Bobtail Member

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    Yes I plan on stopping at Napa and buying a quart of 75w90 for the rear differentials for $16 lmfao. Originally I bought 4 quarts 80w90 conventenal for $3 a quart for it but not going to put it in.
     
  10. jamespmack

    jamespmack Road Train Member

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    It cost more, but buying a 5gal bucket and a pump will be well worth it Compaired to putting it in by the quart. I know it seems like a waist, but its tax deductible and helps you build your arsenal of tools if you plan on doing this a lifetime.
     
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