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Thread: Differential Question

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    Default Differential Question



    I am filling the 9"w/ Royal Purple 75-90 gear oil I know that when it is a posi you have to add the posi additive, but if it has a locker do you have to add any additives?

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    I have never run any additives in any locker or spool I have run since I got my first 4x in the late 60s.....and I have had lockers in all of the 4xs I have had, which happens to be a shitload. No problems, no issues..and most of the time is was basic gear oil and not the more expensive ones like Royal Purple...

  3. #3

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    It is recommended to run the LSD additive but like Pete said, people don't add them and nothing happens. I do just for the peace of mind

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    Nope, no additives with a locking differential. There might be a recommended weight, just read the destructions.
    ___________
    The Lost Boys motto: We don't know where we're going, but we'll be there for awhile. :)

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    Hypoid previously posted:
    "Nope, no additives with a locking differential. There might be a recommended weight, just read the destructions. "

    Ditto. The additive is only for an LSD.

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    there's no clutch plates in a locker so you don't need the additive to increase friction. I run Detroit Truetracs which are technically limited slips but because they're gear based they don't need an additive. I remember when I put a Detroit Locker in the rear of my last Jeep the instructions said specifically not to use any additive or a synthetic lube, just plain old gear oil.

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    Thanks guys I just wanted to make sure after spending the money for the RP that it wasn't going to be wasted later next year when I get my lockers.

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    It is a great thing to have all of these minds to pick!

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    Yes it is Jesse.

  10. #10

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    The oil itself just says "add to all LSD and locking differentials"

    just throwing it out there. I know it's not needed lol

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