Transfer Case - Confession & Question -
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post #1 of 5 Old 08-19-2017, 08:17 PM Thread Starter
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2002 WJ 
Join Date: May 2013
Location: Pulaski
Posts: 679
Transfer Case - Confession & Question

OK, I've been bad. Very bad. I can honestly tell you that my NV247 has NEVER had it's fluid changed in 15 years / 260k miles. 4wd still works (low and progressive), but I do fully expect to pay the price when the time comes. Hopefully I'll beat the clock and get it replaced or rebuilt before it blows up.

Anyways, I tried to do a fluid change a couple weeks ago, but ran into a snag. The 10mm hex fit into the bottom plug, but not the top. I was tempted to knock it in with a hammer, but am worried about damaging it.

Is there any reason why a 10mm hex would fit into one but not the other plug?


Jeep Owner for 17 years; Jeep Guy for 4!
'02 Laredo 4.7L / OME HD & Billies / 255/70R17 GG AT2

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post #2 of 5 Old 08-19-2017, 10:15 PM
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Corrosion is the only thing I can think of

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post #3 of 5 Old 08-19-2017, 11:00 PM
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Originally Posted by RoysJeep View Post
Corrosion is the only thing I can think of

Agreed. Try scratching around in there with an awl or small screwdriver.

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post #4 of 5 Old 08-24-2017, 08:05 PM
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Unless I'm mistaken on mine the top fill plug is a square 3/8 plug. You can use your 3/8 ratchet with or without a extension to open it.

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post #5 of 5 Old 08-31-2017, 08:00 PM
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It *should* be a 10mm hex unless someone got to it before you with the wrong size. If it's stripped, you should be able to run an extractor tap into it.
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