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Thoughts on differential service
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57Fireflite
Posted 2022-02-24 8:29 AM (#619752)
Subject: Thoughts on differential service


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Posts: 59
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Hello, FL-dom

I've been into another orphan car for 20 years and in that shop manual it says to drain and flush the differential with kerosene.

Would that be a bad idea on a DeSoto? Anyone done it?

Maybe it's my mild OCD, but just putting clean fluid into a dirty diff just seems meh.

Your wisdom and experience appreciated.

~Jimbo
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Powerflite
Posted 2022-02-24 12:33 PM (#619760 - in reply to #619752)
Subject: Re: Thoughts on differential service



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I don't recommend it unless it truly has dirt in it that you MUST get out. Otherwise just flush, wipe it down and fill with new fluid.
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57chizler
Posted 2022-02-24 12:41 PM (#619761 - in reply to #619752)
Subject: RE: Thoughts on differential service



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IIRC, the drain plug in '57 isn't at the bottom, so the kerosene couldn't be completely drained. Only way to completely clean the interior of the housing would be to remove the third member.
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Powerflite
Posted 2022-02-24 1:11 PM (#619762 - in reply to #619752)
Subject: Re: Thoughts on differential service



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An example for where this might be useful, is when you purchase a 3rd member from a swap meet and he has the gears sitting in the dirt, like a moron. This is far more common than it should be.
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57Fireflite
Posted 2022-02-24 1:56 PM (#619763 - in reply to #619752)
Subject: Re: Thoughts on differential service


Regular

Posts: 59
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The drain plug is on the bottom of the housing but is slightly off-center; a little kerosene would definitely pool at the bottom unless sopped up or blown out with low-pressure compressed air via the fill plug.

While draining, backlit the fluid with a shop light and it was only slightly transparent, a grayish brown milky muck...

I may just end up refilling while repeating, "it's going to be ok... it's going to be ok..." ??

Thanks for the thoughts!
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