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Unread 07-07-2009, 06:12 PM   #1
sdowney717
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4x4 front axle oil vs rear axle oil

does the front axle oil wear out considering the jeep is always in 2wd mode?
I just changed out the rear oil to mobil 1 synthetic 90w and was wondering if it was worth bothering with the front.

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Unread 07-07-2009, 06:20 PM   #2
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Everything is still spinning, the gears just aren't meshed together under drive tension is all. Plus, gear oil breaks down over time, not just usage. I'd change both.
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Unread 07-07-2009, 06:29 PM   #3
sdowney717
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true it spins around, but not under any heavy pressure like the rear.
I might consider doing it if you will tell me my MPG will go up when I put in synthetic gear oil.
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Unread 07-07-2009, 06:30 PM   #4
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Your mileage won't go up but you'd only be doing yourself a favor if the front hasn't been changed in a while. The front might not be under any load but there is still friction present which generates the heat that breaks down the oil.
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Unread 07-07-2009, 06:34 PM   #5
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The only thing I'm gonna tell you is that it's your Jeep and your money, pick your battles. Changing the lube is about preventative maintenance. If you don't think it's worth your time/money that's all you.
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Unread 07-07-2009, 06:38 PM   #6
blackjack12982
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Quote:
Originally Posted by sdowney717 View Post
true it spins around, but not under any heavy pressure like the rear.
I might consider doing it if you will tell me my MPG will go up when I put in synthetic gear oil.
Wow, really? As someone who had to swap in a new D30 because the PO didn't do a lick of PM, I'd go ahead and recommend you doing this if you don't know when it was done last or know the condition of the fluid that's in there currently. Just my $.02, though.
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Unread 07-08-2009, 02:46 PM   #7
sdowney717
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I dont know when it was done and the jeep has 186000 miles on it.

On the rear, I got rid of the leaky plastic plug.
I brazed on a 1 inch pipe threaded fitting and screwed in a recessed plug. First though I cut it down on the saw, all you need is about 3/8 inch of the cast iron pipe fitting. I was too cheap to go buy another leaky plastic plug. I took off the cover to drain it and have a look at the gears. Cleaned all the rust off and epoxied it and the shot it wit black paint. It looks great and is highly functional.
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Unread 07-08-2009, 03:32 PM   #8
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Originally Posted by sdowney717 View Post
I dont know when it was done and the jeep has 186000 miles on it.

On the rear, I got rid of the leaky plastic plug.
I brazed on a 1 inch pipe threaded fitting and screwed in a recessed plug. First though I cut it down on the saw, all you need is about 3/8 inch of the cast iron pipe fitting. I was too cheap to go buy another leaky plastic plug. I took off the cover to drain it and have a look at the gears. Cleaned all the rust off and epoxied it and the shot it wit black paint. It looks great and is highly functional.
If you want to grenade your front axle by leaving the same gear oil in for another 186k miles because you're "too cheap" to do the most basic maintenance, go for it. Just don't expect to have a working Jeep for very long.
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Unread 07-09-2009, 07:43 AM   #9
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well I pulled the plug out and the fluid is clear and oily not black not dirty.
does anyone know if gear oils shear down with age, do they get thicker or thinner? the oil in there seems perfect. It is so clean looking I am thinking it must have been changed. But of course it never is under any real loading is it.
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Unread 07-09-2009, 07:47 AM   #10
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Originally Posted by the88thpianoman View Post
If you want to grenade your front axle by leaving the same gear oil in for another 186k miles because you're "too cheap" to do the most basic maintenance, go for it. Just don't expect to have a working Jeep for very long.
Yea, thats all there is to it right there.

Chrysler recommends changing diff fluid every 12k-30k miles
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Unread 07-09-2009, 09:00 AM   #11
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Yea, thats all there is to it right there.

Chrysler recommends changing diff fluid every 12k-30k miles
I'm trying to wait until I can afford some True-tracs and 4.10 gearing. I'm not in a position to do the diffs myself so I really don't want to pay $100 to have the fluid changed. I suppose preventative maintenance would be worth it though. It might not be that expensive after all...I don't know.
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Unread 07-09-2009, 10:29 AM   #12
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I'm trying to wait until I can afford some True-tracs and 4.10 gearing. I'm not in a position to do the diffs myself so I really don't want to pay $100 to have the fluid changed. I suppose preventative maintenance would be worth it though. It might not be that expensive after all...I don't know.
The difference in technical knowledge/time spent between those two chores isn't even comparable. All you need to do a fluid change is a tube of RTV, basic sockets or wrenches, somewhere to drain the fluid and something to fill it back up (something as simple as a turkey baster works just fine).
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Unread 07-09-2009, 10:43 AM   #13
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Quote:
Originally Posted by sdowney717 View Post
well I pulled the plug out and the fluid is clear and oily not black not dirty.
does anyone know if gear oils shear down with age, do they get thicker or thinner? the oil in there seems perfect. It is so clean looking I am thinking it must have been changed. But of course it never is under any real loading is it.
Well if you say it won't wear down because it isn't "under any real loading" then you know best and there is no need to change it. What is the question then?
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Unread 07-09-2009, 10:45 PM   #14
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Well if you say it won't wear down because it isn't "under any real loading" then you know best and there is no need to change it. What is the question then?
Yea, when in doubt ALWAYS do that maintenance dude (OP)
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