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Old 11-20-2008, 03:21 PM   #1
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Diff fluid?

I'm sorry but I know this has been asked over and over. I have a 99, what kind of diff fluid and how much?

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Old 11-20-2008, 09:59 PM   #2
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Depends.... Are your axles stock?
open?
lsd?
locker?
which axles?

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Old 11-21-2008, 09:07 AM   #3
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This is an easier question than most would suspect. First, lockers don't change the kind of gear lube needed and most gear lubes already contain the friction modifier required by a clutch-based LSD like the Tracloc LSD is.

So really, all you need is a good GL-5 gear lube that, if you have a LSD in the rear axle, simply includes words to the effect 'compatible with limited slip differentials' or similar. If you don't have an LSD, you can still run a gear lube meant for an LSD just fine.

Viscosity wise, use lower viscosities for cooler conditions, higher viscosities for warmer conditions or for towing. The exact viscosity used is less important in the axles than it is in the engine. 75W-90 is pretty commonly used, but 70W-80 is fine too in cooler areas. 80W-120, 90W-140 etc. for warmer climates or for towing.

I'd also recommend a NON-synthetic gear lube for the axles. It is coming out that the ring & pinion gears run cooler in a non-synthetic gear lube which helps pull the heat out better than a synthetic gear lube does. Some axle manufacturers like Currie have gone so far as to require their customers continue using a non-synthetic GL-5 gear lube in their axles to maintain the factory warranty.
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Old 11-24-2008, 12:15 AM   #4
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Sorry to hijack the thread, but what type of front and rear diff's come in a 97' se tj? Are they both Dana 30's?
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Old 11-24-2008, 12:18 AM   #5
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Quote:
Originally Posted by kylebgt View Post
Sorry to hijack the thread, but what type of front and rear diff's come in a 97' se tj? Are they both Dana 30's?
D30 front
D35 rear
Stock 4.10 gear ratio.
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Old 11-24-2008, 06:21 AM   #6
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Stock 4.10 gear ratio.
Any idea why they would change the stock ratio?
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Old 11-24-2008, 08:19 AM   #7
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Originally Posted by activelydying View Post
Any idea why they would change the stock ratio?
What do you mean? The 4 cyl. manual trans Jeeps came with 4.10:1 gearing in the axles, other TJ's came with 3.07:1, 3.55:1, and 3.73:1 depending on the engine, transmission, and axle options on the Jeep.
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Old 11-24-2008, 08:25 AM   #8
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I just changed mine out with Amsoil Severe Gear.

AMSOIL - SEVERE GEAR® Synthetic Extreme Pressure (EP) Lubricant 75W-140 (SVO)

Their site has a pretty nice drill down by year with options and quantities even if you don't use their products.
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Old 11-24-2008, 04:06 PM   #9
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What do you mean? The 4 cyl. manual trans Jeeps came with 4.10:1 gearing in the axles, other TJ's came with 3.07:1, 3.55:1, and 3.73:1 depending on the engine, transmission, and axle options on the Jeep.

So i'm kinda screwed because I got a 6 cyl? I would love to have 4.10 gears.
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Old 11-25-2008, 12:07 PM   #10
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So i'm kinda screwed because I got a 6 cyl? I would love to have 4.10 gears.
4.10's will give lots of tourqey power but no mpg's. I have 3.07 gears in my jeep with 31x10.50 bfg ats and now this thing wouldnt pull a greasy string out of a cats butt and i have the 4.0
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Old 11-25-2008, 07:36 PM   #11
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Originally Posted by activelydying View Post
So i'm kinda screwed because I got a 6 cyl? I would love to have 4.10 gears.
no offense.. but you have 2000+ post but it seems you dont know much or read anything at all about tech, gearing etc. I dont know if your joking.

4 bangers need higher gearing to compensate the lesser power of the i6.

so no your not screwed.

As for your origional question..

just fill the rear diff with diff fluid until it spills out of the fill hole and plug it back up.. it should not be more than 2- 2 1/2 quarts. just buy 3 quarts just incase.
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Old 11-25-2008, 09:26 PM   #12
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^ that's what I read. As soon as I got them both sealed back up I read to fill it 1/2 in below the fill hole. There is so much inconsistent info out there. How would you know when it was 1/2 below the fill hole anyway?
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Old 11-26-2008, 12:36 PM   #13
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well, I would not do it for my jeep.. I would fill it to the fill hole and leave it. I did this to many trucks /cars and it works.. I jeep is no different.

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