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Thread: Differental oil?

  1. #1

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    Differental oil?

    What lube oil is recommended for the differentials in the 1980 D-50, without a non-slip setup, just straight gears? Does it need a GL4 oil like the tranny?
    Rather stick with a dino oil than a synthetic ...

  2. #2



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    85W-140 or 80W-90 It's just plain old stinky gear oil. I use 85W-140 because I buy it in 5 gallon pails for the concrete trucks.
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  3. #3

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    you can also use 50/50 gear oil and lucas oil stablizer. i use 100% lucas in my differentials front and rear, and i put 25% lucas and 75% gear oil in the transfer case and tranny. stuff makes the limited slip perform better, its like liquid locker for your diffs.
    Last edited by PowerRam348; 01-26-2012 at 11:46 AM.

  4. #4



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    I run 80/90 royal purple gl-5 lube with no issues
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  5. #5

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    that's spendy stuff that royal purple.

  6. #6



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    Ya it is, but its a one time change - don't think I'd buy it again though, not worth the money.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

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