Changing rear diff fluid...
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New User
Joined: Aug 2009
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Changing rear diff fluid...
I live 45 minutes out of town and it's a pain to have to drive in for something I may need to change for rear diff fluid on my 99 F-150 4x5 5.4.
Is there anything I should be aware of or is it pretty much standard.
1) take rear plate off
2) drain old fluid good (Do you put the front end up to drain properly?)
3) clean contact surface good on plate and read diff.
4) silicone plate good.
5) put plate back on.
6) fill with new gear oil
(Recommend FORD gear fluid or other)
(I do not see a hole to fill on plate. Where is it?)
Is there anything I should be aware of or is it pretty much standard.
1) take rear plate off
2) drain old fluid good (Do you put the front end up to drain properly?)
3) clean contact surface good on plate and read diff.
4) silicone plate good.
5) put plate back on.
6) fill with new gear oil
(Recommend FORD gear fluid or other)
(I do not see a hole to fill on plate. Where is it?)
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
you need a couple quarts of 75-w140 synthetic gear lube... and it dont hurt to put the 7 oz tube of friction modifier in the oil... if you have limit slip rear end it is a must. You cna get the tube at Auto Zone.. they have the oil, but generic is cheaper at Wal Mart.
Tuned
Joined: Jan 2008
Posts: 289
Likes: 0
From: Beaumont, CA
im not 100% sure about this, but if there is a metal tag bolted or welded to the passenger side of the axle doesnt that mean its limited slip? and if your rear end is limited slip, you MUST use synthetic 90W gear lube, and the friction modifier definatly helps. I trust Valvoline lube products religiously, so thats all i use... but everyone is entitled to their wrong opinion.... LOL
Tuned
Joined: Jan 2008
Posts: 289
Likes: 0
From: Beaumont, CA
see! i knew i wasnt that far off, glad my input (though wrong) helped out in telling you what NOT to do! LOL
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Senior User
Joined: Apr 2006
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Not sure if this is just me, but I have had REALLY good luck with leaving the diff for 24 hours before filling it with gear oil. I changed it once and filled it right away and it leaked. The next time I let it sit for 24 hours and then filled it with good synthetic 75w-140 oil and friction modifier and it has not leaked at all since.
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