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Old 05-20-2013, 03:16 PM   #1
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Trans fluid change. What type of fluid?

I have a tf999 in my 89 YJ that I just purchased. I discovered that the trans and tcase came out of a 94 model while I was replacing seals over the weekend so I am sure this is not the factory fluid. I dropped the pan to drain fluid and change the filter this weekend. The fluid was very clean that I removed. I picked up some ATF+4 and started thinking about the fluid that was in the trans. Who knows what type of fluid I drained from it. Dex/Merc, Dex III, or maybe ATF4??? I am not sure what needs to be done at this point. I do not want to add fluid creating a bad mixture that will kill my trans. I don't think these will mix. Has anyone ran into this before?

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Old 05-20-2013, 10:27 PM   #2
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Automatic or manual?

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Old 05-20-2013, 11:12 PM   #3
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Auto. I should have added that I know there are a couple of quarts in the torque converter. I am worried about adding 4 quarts of the +4 and then it mixing with the mystery fluid in the converter.
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Old 05-21-2013, 12:03 AM   #4
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I have manual so I can't really help but for the transfer case I used ATF Merc V.
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Old 05-21-2013, 10:30 AM   #5
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Yep ATF+4 is the recommended
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Old 05-21-2013, 11:31 AM   #6
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Problem solved. I ordered Amsoil synthetic multi-vehicle ATF. Their website clearly says you can "top off" with other fluids and can be used where ATF+4 is the spec.so now I don't have to worry about different fluids not mixing.

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