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Old 06-22-2008, 10:40 PM   #1
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differential fluid change

I was going to change my diff fluid tomorrow and was wondering if there are different differentials or do they all call for the same lube? I am trying to figure out what kind and how much fluid I need to get.

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Old 06-22-2008, 11:01 PM   #2
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75w90 in the manual.. I would go with synthetic.. since its suppose to give u better mpg.. Anyone know how much bottles u need.. for d30/35 I plan on doing this tomorrow.

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Old 06-23-2008, 03:00 AM   #3
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Dana 35

Notes:

3.50 pints = 1.75 quarts

Trac-Lok differentials require 4 oz of friction modifier



Dana 30

Note:

2.5 pints = 1.25 quarts
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Old 06-23-2008, 05:22 AM   #4
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The FSM specs the following:
Quote:
- The lubricant should have MIL–L–2105C and
API GL 5 quality specifications.
- Lubricant is a thermally stable SAE 80W–90
gear lubricant.
- Lubricant for axles intended for heavy-duty or
trailer tow use is SAE 75W–140 SYNTHETIC gear
lubricant.
Anyone here not intending to subject their Jeep to heavy duty use?

Synthetic gear oil will not effect your MPG one way or another. Anyone who claims this has happened to them is on crack.
It will, however, hold up better, longer, at higher temps, which results in better protection of your diff gears.
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Old 06-23-2008, 07:09 AM   #5
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So how do I tell if I have a dana 35 or 30 or is 1 the front and the other the rear? Its a 02 wrangler x. How do I tell if I have the track lock diff? I was planning on doing it today along with the plugs and oil/filter. I just bought it friday and dont know if the other owner did any of the maintainence.
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Old 06-23-2008, 07:50 AM   #6
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Quote:
Originally Posted by S.Ga.Rider View Post
So how do I tell if I have a dana 35 or 30 or is 1 the front and the other the rear? Its a 02 wrangler x. How do I tell if I have the track lock diff? I was planning on doing it today along with the plugs and oil/filter. I just bought it friday and dont know if the other owner did any of the maintainence.
30 up front, 35 in the rear on stock TJ. 44 on some rubicons I think.

Here's an ID guide: clicky
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Old 06-23-2008, 11:27 AM   #7
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Quote:
Originally Posted by TJ_Bleu View Post
30 up front, 35 in the rear on stock TJ. 44 on some rubicons I think.

Here's an ID guide: clicky
Thanks. I looked in the manual and it said nothing about changing the fluid, only under schedule b severe use.
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Old 06-23-2008, 11:53 AM   #8
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Pick up the required lube and a bottle of friction modifier, jack the jeep up on jackstands under the frame. Put oil catch basin under rear, loosen and remove all the bolts EXCEPT a top one, leave that one about half way in. Gently pry the cover off, once you get the bottom loose let it drain. Finish removing the top bolt and remove the cover.
I prefer to use a gasket instead of RTV bead so you might want to pick up a couple. The reason for leaving the top bolt in is to keep the cover from falling in the basin and splashing lube all over the place.
Once you have the cover off look at the diff, a LSD should be obvious. If you are still not sure just add the friction modifier anyway, it won't hurt anything.
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Old 06-23-2008, 12:17 PM   #9
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Don't add friction modifier separately unless you know for certain the gear lube you buy does not already have it and that you need it because you have a Tracloc limited slip differential. Just about every (99.99%) GL-5 gear lube made for axles found on store shelves will already contain the friction modifier additive and you don't want to add more on top of that.

Look on the rear label of the bottle of gear lube where you'll very likely find words to the effect of 'Compatible with axles containing limited slip differentials' or similar which indicates it already has the additive. It's in most gear lubes because this additive is compatible with axles whether or not they have a limited slip differential. Only a few specialized gear lubes not commonly found on auto parts store shelves will not have the friction modifier additive.
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Old 06-23-2008, 01:16 PM   #10
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Quote:
Originally Posted by distortedtj View Post
Dana 35

Notes:

3.50 pints = 1.75 quarts

Trac-Lok differentials require 4 oz of friction modifier



Dana 30

Note:

2.5 pints = 1.25 quarts
damn so a total of 8 quarts.. thats a lot.























































j/k thanks.. 3 quarts is not bad.. since they are 15 bucks each for synthetic.

Quote:
Originally Posted by richp View Post
Pick up the required lube and a bottle of friction modifier, jack the jeep up on jackstands under the frame. Put oil catch basin under rear, loosen and remove all the bolts EXCEPT a top one, leave that one about half way in. Gently pry the cover off, once you get the bottom loose let it drain. Finish removing the top bolt and remove the cover.
I prefer to use a gasket instead of RTV bead so you might want to pick up a couple. The reason for leaving the top bolt in is to keep the cover from falling in the basin and splashing lube all over the place.
Once you have the cover off look at the diff, a LSD should be obvious. If you are still not sure just add the friction modifier anyway, it won't hurt anything.
where can I buy gaskets at? I hate using rtv.. thats why I put it off.. waste too much time..
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Old 06-23-2008, 05:23 PM   #11
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use rtv its what mopar calls for
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Old 06-23-2008, 05:29 PM   #12
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use rtv its what mopar calls for
I agree, RTV is the way to go even if it is a little more trouble and time consuming. Personally I prefer RTV Ultra Black. It's never leaked wherever I've used it over the past ten years.
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Old 06-23-2008, 05:34 PM   #13
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If you can afford it and you either A. run a lot on the highway or B. Wheel a lot I'd recommend using Royal Purple. I run it in my diffs and have honestly felt and seen a temperature difference before and after putting it in. It also quieted down my locker noise.

And pleh.... RTV is a thing of the past. Lubelockers are where it's at. I've had my covers off numerous times since getting them and never a leak nor a worry. It takes fluid changes/inspections down to about 7 minutes per end.
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Old 06-23-2008, 05:40 PM   #14
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Originally Posted by 1BLKJP View Post
If you can afford it and you either A. run a lot on the highway or B. Wheel a lot I'd recommend using Royal Purple. I run it in my diffs and have honestly felt and seen a temperature difference before and after putting it in. It also quieted down my locker noise.

And pleh.... RTV is a thing of the past. Lubelockers are where it's at. I've had my covers off numerous times since getting them and never a leak nor a worry. It takes fluid changes/inspections down to about 7 minutes per end.
What makes Royal Purple any better than other synth gear lube? Like say, Mobil1 which is available all over the place at half the cost?

Next someone is gonna pipe up with the Amsoil spiel...

(hey does that get you kicked off this board? It should)
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Old 06-23-2008, 05:44 PM   #15
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Quote:
Originally Posted by TJ_Bleu View Post
What makes Royal Purple any better than other synth gear lube? Like say, Mobil1 which is available all over the place at half the cost?

Next someone is gonna pipe up with the Amsoil spiel...

(hey does that get you kicked off this board? It should)
I honestly don't know what the difference is between the Royal Purple and the other synthetics. All I know is that I have always ran synthetics in my diffs and now that I've changed to RP and used a temp gun on them in hotter weather my diffs are cooler all other variables being the same.

And no I'm not giving any spiel here. I wheel my junk more than probably 99% of the people on this board and wheel it hard. The vast majority of things I recommend are coming from real world uses and not some internet hearsay. Take it for what you will, it's only my opinion.
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Old 06-23-2008, 05:50 PM   #16
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Quote:
Originally Posted by 1BLKJP View Post
I honestly don't know what the difference is between the Royal Purple and the other synthetics. All I know is that I have always ran synthetics in my diffs and now that I've changed to RP and used a temp gun on them in hotter weather my diffs are cooler all other variables being the same.

And no I'm not giving any spiel here. I wheel my junk more than probably 99% of the people on this board and wheel it hard. The vast majority of things I recommend are coming from real world uses and not some internet hearsay. Take it for what you will, it's only my opinion.
Gotcha.

Thanks for the advice.
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Old 06-23-2008, 08:23 PM   #17
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I dont know if I need to change it or not. The manual doesnt say to and it says to change the transfer case at 120k. I will be using it as a daily driver. No offroading or much interstate driving.
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Old 06-23-2008, 08:42 PM   #18
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I forgot about those lubelockers, I seem to remember they were tad pricey. As for Royal Purple, thats kind of a rare animal here in the NE and I can buy Amsoil at the local barber shop. I just noticed the Limited slip additive today in the gear lube when I went down to take advantage of the $26 for 5 quarts of Mobil-1 and a Mobil-1 filter at Advanced Auto. I have enough filters and oil for the next year now. They have a sale going on for the next few days. I have not bought gear lube for a couple of years now, I picked up 2 cases of Mobil-1 and I still have enough for two more full changes on two of the jeeps. I tend to buy in quantity when it's on sale or at a good price.
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Old 07-01-2008, 10:02 AM   #19
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How do you tell if you have the limited slip? I looked at advanced and they had the mobile1 and valvoline 80w90 semi synthetic for only $5 a quart. It didnt say anything about limited slip though.
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Old 07-01-2008, 11:36 AM   #20
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I change my diff fluids every time i was in deep water. that´s all 1000 to 2500 mls. for that the cheap 80w90 is more than enough, for HD use as well.

The FSM says we should use the expensive 75w140 because the FSM says we should change the diff fluids only all 12000 mls.
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Old 07-01-2008, 11:57 AM   #21
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Quote:
Originally Posted by S.Ga.Rider View Post
How do you tell if you have the limited slip? I looked at advanced and they had the mobile1 and valvoline 80w90 semi synthetic for only $5 a quart. It didnt say anything about limited slip though.
Read the rear label carefully where most will indicate they are compatibile with limited slip diffs which means they have the friction modifier additive.
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Old 07-01-2008, 08:25 PM   #22
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i ONLY use the 75-140 gear oil from wal-mart.
i seached all over town and it was the ONLY oil that met the required specs.
royal purple, valvoline, mobil,, nobody but the walmart, was like 11-12 bucks a quart.

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