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Unread 07-29-2009, 04:34 PM   #1
stageninja
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T-Case fluid

Lucas Gear Oil states on the bottle that it is "excellent for Transfer cases". Would this be the case for the 249? My 249 is in great shape as it is with 140,000 miles. The reason I ask is I have tranny fluid on the tranny and the T-case. I would like to isolate the leak as there isn't enough leaking to show on the dipstick or drop the level in the t-case. It seems to only be a drop a day just hanging from each component. I know it is a seal, just want to know if it is one the other or both by, using a fluid of a different color in the T-case but I certainly don't want to prematurely ruin the VC.

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Unread 07-29-2009, 04:45 PM   #2
Bama_WJ
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I think your only suppose to use a special Mopar fluid in your 249. Someone correct me if I'm wrong.
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Unread 07-29-2009, 05:22 PM   #3
ratmonkey
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atf+4 only in the 249.

i tend to shy away from lucas everything these days.

take a picture of the drips and post it. i'd put money on it being the tranny output seal.
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Unread 07-29-2009, 06:22 PM   #4
gomes512
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Yep fluid as stated above, although technically I think both the 249 and 242 would be able to run olive oil in a jam.

However, gear oil is a different story. There are other transfer cases that do call for gear oils in other manufacturers but the 249 and 242 definitely don't. Low viscosity is the name of the game.
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Unread 07-29-2009, 08:37 PM   #5
sandman
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from my understanding chain driven t-cases usually recomend ATF and gear driven cases call for gear oil. im not sure why and youd probably be fine running just about anything in the early ZJ (not WJ) cases but i would still stick with atf4.

Lucas stuff is pretty thick right? if so it may be too thick for the pump. just a thought.
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Unread 07-29-2009, 09:05 PM   #6
ratmonkey
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the gear cases rely on the gears to move the fluid around, chain cases use an oil pump on the output. the oil pumps can not move a fluid as thick as gear oil.
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Unread 07-29-2009, 09:23 PM   #7
stageninja
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Thanks, That's the info I am looking for. Since it isn't draining the aforementioned components I am not thinking about tearing into anything. Just trying to isolate. As far as Lucas is concerned... I don't use it for everything but where I can, I try to use it, as almost two years of income was from working on the construction, and now continuing to do production work at Lucas Oil Stadium.
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Her's '98 Chargold ZJ Ltd. 4.0 2wd
Our 1st '97 White, ZJ Ltd, 5.2, The parts Jeep for 5 years...R.I.P. Sent to Pic-A-Part 5/17/2013

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