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Unread 03-10-2004, 08:32 PM   #1
Gumby1
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2014 JK Wrangler 
 
Join Date: Mar 2004
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How do you know what kind of diff you have?

We bought a 96 grand a little while ago and was wondering how do you tell what kind of diff is in the back. I want change all the oils (diffs, transfer case etc) in this thing but on the rear it says to put in the additive if it has a certain diff. Also is their anything special about the atf listed in the owners manual? Or can i use an aftermarket fluid?

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Unread 03-10-2004, 09:23 PM   #2
greasefingers
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My 94 calls for 75W-90 weight oil. If you are lucky, jeeps have an identification tag which is held on by the pumpkin pan bolts. It will state the part number & gear ratio. A second ID tag is supplied if the Diff has Trac-loc (lmited slip) option.
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Unread 03-11-2004, 05:15 AM   #3
thunderchooch
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Here is a easy way to see if you have the Dana 44 Aluminum in the back, See if the housing is rusting at all, or just scrape the bottom of the pumpkin and wait a day or two and see if it starts to rust. If it doesn't rust it is the aluminum dana 44.
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Unread 03-11-2004, 06:52 AM   #4
Rjwrangler
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Quote:
Originally Posted by thunderchooch
Here is a easy way to see if you have the Dana 44 Aluminum in the back, See if the housing is rusting at all, or just scrape the bottom of the pumpkin and wait a day or two and see if it starts to rust. If it doesn't rust it is the aluminum dana 44.
Just go to Jeep.com/customer service and email them. In the email request a build sheet for your vehicle, then provide them with your VIN#. That is all it takes and in less than 3 days you will know every part that went into your Jeep.

I have ttried this on Jeeps as old as 93, it may even work for earlier models.
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Unread 03-11-2004, 08:34 AM   #5
Swamp Boy
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There is always the magnet test.. As we know the magnet wont stick to aluminium..

Carl
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Unread 03-12-2004, 08:38 PM   #6
Gumby1
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Ok, so if its got an aluminum housing its a limited slip diff, and a good old steel housing is an open diff which i can just use normal gear oil with no additive? Thanks guys
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Unread 03-12-2004, 10:05 PM   #7
Meerkat
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Quote:
Originally Posted by Gumby1
Ok, so if its got an aluminum housing its a limited slip diff, and a good old steel housing is an open diff which i can just use normal gear oil with no additive? Thanks guys
Umm, no. If you have an aluminum housing, then you have the Dana 44, but having the Dana 44 doesn't mean you have a limited slip differential. Another consideration is whether or not you have the factory tow package. Having the tow package means you have a 3.73 axle ratio. Which requires SAE 75W-140 Synthetic Gear Lubricant (which none of the autoparts stores I have checked carry). Models with Trak-Lok require an additive. Now, if your rear differential has Trak-Lok, it should have a tag held on by one of the cover bolts that says "limited slip" "Trac-Lok" or similar, however, the tag could simply be missing. The best way, failing finding a tag, is to request a build sheet from Jeep . Simply send them an email with your VIN requesting a build sheet. They will email one back to you, and you will find out all kinds of good stuff about your vehicle. What kind of rear axle you have, the gear ratio, type of trim, etc, etc.
HTH
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