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Old 12-11-2009, 03:24 PM
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Differential Fluid

OK so I got to change my rear differential fluid this week before the snow. The ONLY thing is I was only able to do the rear, with 75w-140 Mobil 1 for conv. or limited slip diffs. Does anyone see a problem with not changing the front to new and same weight fluid? How long is it possible to go if any damage will occur? I do notice when I put it in full time it will slip a bit at low speeds. Is this because the front has OLD lower weight fluid? Please help any way possible!

1999 Jeep Grand Cherokee Laredo I6 4.0L Selec-Trac
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Old 12-11-2009, 03:29 PM
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Re: Differential Fluid

BTW this is the oil I used. Says for limited slip diffs on it so that should be OK right?
https://mobiloil.com/USA-English/Mot...75W-140LS.aspx
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Old 12-12-2009, 01:31 PM
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Re: Differential Fluid

No one has any say?
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Old 12-12-2009, 02:59 PM
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Re: Differential Fluid

you only need the LS additive if you have a limited slip diff.....but it wont hurt anything if you use it and dont need it.

for the front, how many miles on the current fluid? you should be good for a minimum of 30K probably good for 60K milkes......
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Old 12-12-2009, 04:09 PM
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Re: Differential Fluid

I have 118,000 on the Jeep. The question i'm asking is, is it bad that I only got to do the rear diff fluid change, and I used a heavier weight....75w140. So the rear has new 75w140 and the front has the old stock fluid for now...
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Old 12-12-2009, 04:12 PM
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Re: Differential Fluid

have new in one and old in another itself will have no affect on anything but the front.

the front having very old fluid itself is not a good idea. esp if 118 and never been changed. they should be done every 50-60 for normal duty.
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Old 12-12-2009, 04:46 PM
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Re: Differential Fluid

Ok so the different oil weight for now, maybe a week before I can do the front with the same new 75w-140 isn't going to blow anything?
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Old 12-17-2009, 12:18 PM
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Re: Differential Fluid

Quote:
Originally Posted by Unholyskorn86 View Post
Ok so the different oil weight for now, maybe a week before I can do the front with the same new 75w-140 isn't going to blow anything?
Your Jeep isn't going to explode. If it does, it will be for reasons other than non-matching fluids in your diffs.
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Old 12-17-2009, 04:14 PM
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Re: Differential Fluid

Thank you BTC, exactly the answer I was in need of lol
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Old 12-17-2009, 09:39 PM
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Re: Differential Fluid

ok I know you got your anwser, but I think that if your jeep has any service history, you need to look through it to see if and when the diff oil has been changed. so that you know this service is nessicary at all.

It's not healthy for it to run on old oil for a long period of time.
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Old 12-17-2009, 10:39 PM
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Re: Differential Fluid

i honestly use a "lighter" fluid in the front some reason it was reckomended like that for my different gearing.
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Old 12-18-2009, 12:39 PM
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Re: Differential Fluid

Quote:
Originally Posted by Dylans3960ccs View Post
ok I know you got your anwser, but I think that if your jeep has any service history, you need to look through it to see if and when the diff oil has been changed. so that you know this service is nessicary at all.

It's not healthy for it to run on old oil for a long period of time.

Either way I have changed the back and will be changing the front soon so that eliminates running old oil for a long period of time....

D you got any documentation where it says use lighter in the front?
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