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Quick Transfer case fluid question

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Old 01-11-2022, 12:15 PM
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Default Quick Transfer case fluid question

99 XJ 4-door 4.0L AW4 Trans. 4wd
Question.
I looked up in my OEM owners manual and it states the following:
For the AW4 automatic trans. it recommends - Mopar ATF or labeled Dexron II (2) or Mercon
For the Transfer case it recommends - Mopar ATF or labeled Dexron III (3) or Mercon

Seemed odd to me that it lists Mopar ATF on both...but for non-Mopar brand it doesn't list the same one. What gives? Which one is correct for the transmission and which one is correct for the Transfer case?

Thanks!
Old 01-11-2022, 12:22 PM
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Originally Posted by RocketMouse
99 XJ 4-door 4.0L AW4 Trans. 4wd
Question.
I looked up in my OEM owners manual and it states the following:
For the AW4 automatic trans. it recommends - Mopar ATF or labeled Dexron II (2) or Mercon
For the Transfer case it recommends - Mopar ATF or labeled Dexron III (3) or Mercon

Seemed odd to me that it lists Mopar ATF on both...but for non-Mopar brand it doesn't list the same one. What gives? Which one is correct for the transmission and which one is correct for the Transfer case?

Thanks!
IIRC, the different Dextrons cover different heat ranges? What I'm reading MOPAR ATF and Mercon both cover the heat range of both components.
Old 01-11-2022, 01:03 PM
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I followed my shop manual (Sec 1-2: Recommended lubricants and fluids) and put Mercon ATF in both my transfer case and my AW4 Transmission. Dexron I or II may also be used in the transfer case as well
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Old 01-11-2022, 03:06 PM
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I use Dex III for both in my 2000.
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Old 01-11-2022, 07:23 PM
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Same Mercon rated ATF for both.
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Old 01-12-2022, 09:21 AM
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Cool... thanks for the input everyone. I wanted to make sure I picked up the correct yet most cost effective type for both.
The XJ has only seen a couple actual winters with snow/ice since the last time both the trans and transfer case were serviced with fluids.... but will still hit all those drain plugs with a bit of penetrating oil for a day or 2 before attempting, just to be safe.
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