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Old 04-28-2009, 09:39 PM   #1
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Differntial/Transfer Case Maintenance question...

My Tj has 114,000ish miles on it. I bought it with 99,000 4 years ago (it's not my daily driver obviously.) I have never had the differential or transfer case fluid changed. How often should this be done? I'm guessing since I haven't done it, and I don't know when the previous owner did it, that I should probably have it done. How often should this be done? I don't wheel my rig too hard, mainly trails and mud, no rock climbing...

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Old 04-28-2009, 09:42 PM   #2
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I think its every 20k-30k miles under normal use. If off-road and in very deep water/mud I changed mine after the trail ride. Have you done the tranny fluid?

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Old 04-28-2009, 10:07 PM   #3
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I haven't changed the tranny fluid either... Jiffy Lube will do the tranny, both differentials, and the transfer case for $250. Sounds pricey to me. I am capable of doing it all myself, but after I buy everything (RTV, oil drain pan, fluid, fluid pump, etc...) I have a feeling I'd be better off paying them to do it. My driveway is also dirt, so I don't want to be opening up the diff's and have any dirt/dust fill get in there. thoughts?
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Old 04-29-2009, 05:33 AM   #4
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I would shop around on the price just to make sure. Is the tranny an auto or manual? I know when they do the auto, they suck everything out on a pump. Which in some cases can clog things up, vs taking the pan off doing a new filter with the fluid. I know the times I have done it in the garage it was not fun, fluid every place.. LOL
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Old 04-29-2009, 06:05 AM   #5
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It's a 5-speed...
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Old 04-29-2009, 09:23 AM   #6
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FYI: I changed all my fluids when I bought mine at 74k. All very simple, less than 2 hours for all... I replaced all lubes with synthetic and friction modifier for the locker.. The only thing I have not changed is the manual transmission because it take a 17 or 18 mm alien key. I need to order one. But all fluid and gaskets including for trans cost right at $80 from local part store.
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Old 04-29-2009, 12:26 PM   #7
Knows a couple things...

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First, be wary of the gear lube that you fill the transmission with. There was a typo in some manuals that recommended 75W-90 GL-5 and it really should have said GL-3. Most GL-5 gear lubes are too harsh to use inside your AX-15 transmission and will in the long term cause synchro damage. GL-5 is not just a later version of GL-3, it's a completely different purpose gear lube which is really meant for axles.

In your AX-15 transmission, the #1 recommendation is Redline MT-90 which is a 75W-90 GL-4. In this case, the GL-4 is an upgrade to the GL-3 spec which is better... unlike the GL-5 gear lube. You can find it at places like Summit Racing - High Performance Car and Truck Parts | 800-230-3030 or Red Line Oil

For the axles, you do want a GL-5 gear lube which can be a 70W-80, 75W-90, etc. The exact viscosity is not that important in the axles. If you tow, a higher viscosity like 80W-120, 80W-140 or close to that is recommended. If your rear axle has a Traclock limited slip differential, make sure the back of the gear lube bottle has words to the effect of "Compatible with limited slip differentials" or similar which means it contains the friction modifier additive that the Tracloc LSD requires. The good news is that 99% of the GL-5 gear lubes already contain the require friction modifier additive since the additive is compatible with all types of axles. Don't be tempted to add more friction modifier additive if the gear lube already contains it.

So far as your transfer case goes, nearly any ATF is fine. It's not fussy about the type of ATF it gets so long as it's a good quality. ATF+3 is fine, ATF+4 is fine.
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Old 04-29-2009, 05:40 PM   #8
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Quote:
Originally Posted by Jerry Bransford View Post
First, be wary of the gear lube that you fill the transmission with. There was a typo in some manuals that recommended 75W-90 GL-5 and it really should have said GL-3. Most GL-5 gear lubes are too harsh to use inside your AX-15 transmission and will in the long term cause synchro damage. GL-5 is not just a later version of GL-3, it's a completely different purpose gear lube which is really meant for axles.

In your AX-15 transmission, the #1 recommendation is Redline MT-90 which is a 75W-90 GL-4. In this case, the GL-4 is an upgrade to the GL-3 spec which is better... unlike the GL-5 gear lube. You can find it at places like Summit Racing - High Performance Car and Truck Parts | 800-230-3030 or Red Line Oil

For the axles, you do want a GL-5 gear lube which can be a 70W-80, 75W-90, etc. The exact viscosity is not that important in the axles. If you tow, a higher viscosity like 80W-120, 80W-140 or close to that is recommended. If your rear axle has a Traclock limited slip differential, make sure the back of the gear lube bottle has words to the effect of "Compatible with limited slip differentials" or similar which means it contains the friction modifier additive that the Tracloc LSD requires. The good news is that 99% of the GL-5 gear lubes already contain the require friction modifier additive since the additive is compatible with all types of axles. Don't be tempted to add more friction modifier additive if the gear lube already contains it.

So far as your transfer case goes, nearly any ATF is fine. It's not fussy about the type of ATF it gets so long as it's a good quality. ATF+3 is fine, ATF+4 is fine.

That about sums it up. Thanks Jerry.

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