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Rear end fluid change?

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Old Mar 2, 2004 | 09:07 AM
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Rear end fluid change?
How often do you have to change/add more oil to the rear and front end of a 4x4 truck? I just changed the pinion seal in the rear and added a quart of 80W-90 to it and was curious if i should have drained the entire thing and replaced with new or if what i did was ok, and if I should do the same on the front end?
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Old Mar 2, 2004 | 02:24 PM
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deananthony

It probably would have been a good idea to have changed it.

Do you know how long the oil has been in there?
 
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Old Mar 2, 2004 | 03:12 PM
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125000 miles, it was milky looking and about a quart drained out of it
 
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Old Mar 2, 2004 | 03:50 PM
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You must have had some moisture in there. I recommend taking off the cover and replacing all the fluid.
 
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Old Mar 2, 2004 | 04:09 PM
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i agree with nascarmark, on my 4-wheeler, anytime i take it through a creak or river, i always change the oils..anytime your fluids have a milky appereance, means moisture is present
 
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Old Mar 2, 2004 | 07:19 PM
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ford says every 100k miles. if the fluid has never been changed it would deffinately be a good idea to do so. i'm gonna do mine soon now that the weather is getting nicer.
 
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Old Mar 3, 2004 | 01:19 AM
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deananthony

Agree with the others.

That oil needs to come out as soon as possible, if its milky looking.
 
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Old Mar 3, 2004 | 05:46 AM
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Milk is Good for the bones though

I put water in all my oils to help the cooling.....
 
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Old Mar 3, 2004 | 06:39 AM
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keelarpluto.....you really put water in your oils?? or were ya joking?
 
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Old Mar 3, 2004 | 07:38 AM
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Thanks for the input, its always good to get advice from people that really know about trucks
 
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Old Mar 3, 2004 | 07:46 AM
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Now i am curious about the Transmission and routine maintence for it. I have the T-18 4 speed tranny, what needs to be done to ensure the life of this cast iron beast
 
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Old Mar 3, 2004 | 10:28 PM
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deananthony

If in doubt, oil does not cost that much, drain the transmission and the transfer case too.
 
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Old Mar 4, 2004 | 05:28 AM
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Cool
I'd like to jump in here if I could, with a related question: my '94 F150 2wd with 3.55.1 Traction Lok (posi) rear end has 90k on it, I'm thinking its time for a gear lube change, I've heard that I must get something called friction modifier from Ford and add along with the fresh gear lube for the posi unit, is this true? and if so can I use something else from anouther manufacturer instead? and would it be advisable to go to a synthetic lube at the same time? thanks for any imput.
 
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Old Mar 4, 2004 | 08:38 AM
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From: DE
MOst of the gear oils sold in the stores have friction modifier added, for example Mobile 1 or RedLine, etc. Check the label. HTH
 
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Old Mar 4, 2004 | 08:42 AM
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From: DE
Originally posted by KeelarPluto
Milk is Good for the bones though

I put water in all my oils to help the cooling.....
Actually I installed an old window air conditioner unit in each my front and rear diffs. It cools much better than water. .

Later,
 
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