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Unread 10-23-2009, 05:10 PM   #1
wisconsin26
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Recommended Maintenance on transfer case and differentials

I just purchased my second Jeep. It is a 1999 Grand Cherokee Limited with 111,000 miles. It has been great so far with no problems - except for a five instrument cluster bulbs I replaced today.

My question: what type of service or preventative maintenance should I perform on the transfer case and front and rear differentials? How much does this service typically cost? Like I said there are no problems so far (noises, driveability problems, etc.), but what is a good rule here? I need this vehicle running for a few more years until I am finished with grad school; however, I do not want to pay for unnecessary service.

For example, I received a quote from a local dealer to replace bulbs in my instrument cluster for 160 dollars. I took my chances and did it myself. It took me literally 20 minutes and a few dollars for the bulbs.

Any advice given is greatly appreciated. I apologize in advance for not using the correct terminology or posting in the wrong forum.

Thanks.

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Unread 10-23-2009, 05:15 PM   #2
1997ddzj
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If you can change bulbs you can do your diff fluids. As far as cost i have no clue, but like everything else im sure it will be to much. It might cost you 50 bux in fluid, gas to get it, and a big lunch to do it in an hour.
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Unread 10-23-2009, 05:17 PM   #3
Mean Max
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I would recommend servicing the differentials & transfer case about once a year. It's easy, and it's cheap to do yourself.

Here is a link to a Basic Differential Maintenance "how-to" write-up that I did.

http://www.jeepforum.com/forum/f12/b...enance-728231/

T-case service is basically drain & refill. You may have to add an additive, depending on your T-case model. What transfer case gear selections do you have on the shifter?

Max
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Unread 10-24-2009, 06:28 AM   #4
TMCXJ
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Always always always remove the FILL plug on your transfer case BEFORE you remove the drain plug!!!!!!!!

If you remove the drain plug, and then can't remove the fill plug, ...well, you get the idea. That's the only way you could possibly mess up the job. Otherwise, what they said.

As for your terminology, I see nothing wrong whatsoever (in fact, your spelling and grammar are perfect, as well - not something we often see, lol!). And you're posting in the correct forum. 'Nother attaboy. And you're here, so I guess you're batting a thousand! Welcome to jeepforum, wisconsin26. We're glad to have you here.
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Unread 10-24-2009, 07:06 AM   #5
95WhiteTrash
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[QUOTE=TMCXJ;8161227]Always always always remove the FILL plug on your transfer case BEFORE you remove the drain plug!!!!!!!!

If you remove the drain plug, and then can't remove the fill plug, ...well, you get the idea. That's the only way you could possibly mess up the job. Otherwise, what they said.

This was my problem, I tried using a crescent wrench to loosen the drain and fill plugs,drain plug was okay, fill plug was put on with the gorilla grip from previous owner. my solution was to go to sears and buy a 30mm wrench walked out to the parking lot and loosen the plug, walked right back in and returned the wrench [cost $27.00] now my crescent wrench works just fine!
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Unread 10-24-2009, 07:28 AM   #6
Falkon
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Here we go again. Why do you do something like this and then brag about it on an open forum? It says a lot about you as a person. I'm not perfect, but at least realize it's wrong. You seem proud of it.
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Unread 10-24-2009, 07:42 AM   #7
cmonson
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^+1..........

back on topic, everything you need can be found here:
Jeep Grand Cherokee WJ - Maintenance information and schedules
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Unread 10-24-2009, 10:32 AM   #8
QuadraTokn
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replace these fluids every 30k miles, at the least.
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Unread 10-25-2009, 07:29 AM   #9
wisconsin26
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Thanks for the comments.
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Unread 10-25-2009, 08:26 AM   #10
Turbonut
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Here's some schedules and product information:
Jeep Grand Cherokee WJ - Maintenance information and schedules
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Unread 10-25-2009, 09:49 AM   #11
rev353
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I just got my first TJ two weeks ago. I went to the trusty owners manual and it showed me the drain and fill plugs and what type of oil. I installed Amsoil just because I really like it. I do recommend synthetic oil know matter what brand. I used 75w/140 front and rear diff and tranny, and synthetic ATF in the transfer case. A daily driver, check it at least every or every other oil change, play toy I'd change at least once a year and before winter.
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