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Transfer case oil change . . .

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rammons
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Joined: 20 Mar 2005

PostPosted: Mon Mar 21, 2005 7:19 am    Post subject: Transfer case oil change . . . Reply with quote

I'm new to the jeep maintenance world and wanted to know how to change the fluid in the transfer case. I've already read the very nice article on changing the differential oil. I would also like to know if I should use a synthetic oil in the differentials and transfer case. I have (read my WIFE's) a 2000 TJ with 5 speed and 80K miles. Any help would be greatly appreciated.

Would it be to my advantage to change out the transmission oil and put synthetic in there also?

What brands of oils do you all use?

Thanks,

Bob
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KnightFire
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Joined: 07 Jan 2004
Location: Hanover, MD

PostPosted: Mon Mar 21, 2005 9:31 am    Post subject: Reply with quote

I'm about to do the diff's and Transfer Case, for the front/rear differentials I chose Amsoil 75W90 Gear Lube and going to use Amsoil Unverisal Trans fluid in the Transfer Case.

Going fully synthetic is always a smart move, you can free up a tiny bit of HP and gain a little MPG, not to mention it lasts MUCH longer and protects better than conventional fluids.


KnightFire
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Black2001TJ
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Joined: 03 Jan 2004

PostPosted: Mon Mar 21, 2005 10:19 am    Post subject: Reply with quote

Yup, I always use a Synthetic gear lube for the axles and Synthetic auto trans fluid for the transfer case.
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Code3TJ
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PostPosted: Mon Mar 21, 2005 11:03 am    Post subject: Reply with quote

Yes, I use synthetic in everything - especially components like the diffs, t-case etc that go for extended periods without being changed. As for your first question, it's pretty easy, you might be able to get away without dropping the skid plate, but you might end up with a puddle of ATF all over the place. If not, support the transmission with a jack. If you look at the back of the t-case, there are 2 plugs to the left (as you face the rear of it) of the output/driveshaft. Open the upper one first, it's the fill. Position your catch pan and open the lower one. After it drains, close bottom, fill, close top. It'll hold about 2.2 pints. Wink
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Black2001TJ
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PostPosted: Mon Mar 21, 2005 12:06 pm    Post subject: Reply with quote

to further what code said, I would resort to dropping that skid only if you have to... Those 6 bolts that hold the tcase skid in place can be a pain in the butt if you accidentally spin one of the welded nuts that they bolt into. Very easy, 10 minute process tops!
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rammons
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Joined: 20 Mar 2005

PostPosted: Mon Mar 21, 2005 7:24 pm    Post subject: Thanks! Reply with quote

You guys are great! Thanks for the quick response.

Are there any other suggestions for brand of synthetic oil? I've heard Amsoil is pretty good.

Bob
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Code3TJ
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PostPosted: Tue Mar 22, 2005 12:07 am    Post subject: Reply with quote

I use Red Line, but I know people have had trouble finding it.
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Keithtj
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PostPosted: Tue Mar 22, 2005 6:25 am    Post subject: Reply with quote

http://www.jeephorizons.com/phpbb/viewtopic.php?t=4038

check this out!
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rammons
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Joined: 20 Mar 2005

PostPosted: Thu Mar 24, 2005 11:40 am    Post subject: thanks again Reply with quote

All great info! You guys rock! One more question though: How do I know if I need a friction modifier in my differentials?

BTW, I'm running an all stock TJ.

Thanks,

Bob
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'drack
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PostPosted: Thu Mar 24, 2005 12:27 pm    Post subject: Reply with quote

If you have the factory optional limited slip in the rear you'll need to put the additive in. Should be a tag on the diff cover that says 'use such and such fluid'.
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rammons
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Joined: 20 Mar 2005

PostPosted: Thu Mar 24, 2005 5:00 pm    Post subject: Tags on diffs Reply with quote

I looked at the tags on both diffs, but I can't tell anything from the them. The front tag reads:
P/N 0881-4
259200AC13KH

The rear tag reads:
P/N 6567-3
704454AB05TV

Anybody know? Confused

Bob
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Thu Mar 24, 2005 7:26 pm    Post subject: Reply with quote

how much more is synthetic fluid?
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Code3TJ
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PostPosted: Thu Mar 24, 2005 11:53 pm    Post subject: Reply with quote

Is there another tag attached to one of the diff cover bolts? Should say 75w90 or something like that.

I buy mine in gallong jugs - honestly can't remember how much I pay. Summit Racing has it for about $7.95/quart.
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rammons
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PostPosted: Fri Mar 25, 2005 5:04 am    Post subject: Reply with quote

No tags on any of the bolts. The tags I saw were just stickers stuck to the diff case. I'll look again today to make sure.

Will the diff be damaged if I go ahead and put the friction modifier in it (if it's not needed)? That may be the easiest thing to do. It may cost a little extra, but if in doubt . . . whip it out! Wink

Thanks,

Bob
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ehirner
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PostPosted: Fri Mar 25, 2005 6:49 am    Post subject: Reply with quote

You need the friction modifier if you have the track-lock differential. If it's open, you don't need it. Unless you or a previous owner removed the tag, there will be a tag held on the by the differential cover bolts that will have your gear ratio and if it had the stock limited slip. For example, if you have 3.73s and the track-lock, it will show 3L73. If same gears but open, it'll show 3 73. Being a 2000 TJ, you will only have 3.07, 3.73 or 4.10 gears. Look for one of those numbers.
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