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  #1  
Old 01-01-2011, 09:49 AM
jack7481 jack7481 is offline
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Default qustions about oil in the DIFF.

I will be changing the front and back diff.oil soon and I have a few qustions about the oil to use.I need some adivice on what would be my best bet regular oil or synthetic? the brands I'm thinking about using are valaline,amsoil or royal purple.
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Old 01-01-2011, 10:39 AM
pooleo pooleo is offline
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Default Re: qustions about oil in the DIFF.

i would use mobil 1 gear oil. 75-90 or the heavier one
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Old 01-01-2011, 11:14 AM
sgtsandman sgtsandman is offline
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Default Re: qustions about oil in the DIFF.

See what you have in the differentials already. Some had synthetic put in from the factory and the synthetic is supposed to be a "life of the vehicle" item. Also, if you have limited slip or a locking rear differential, you will need an additive for that or you will burn up the limited slip or locker.

Check your owner's manual to be sure on the weight. For example, on mine, they specify 80W90 for both axles in one chart and 75W90 (Front) and 80W90 (rear) in another. I'm suspecting a typo but since I don't have a front differential, I'm not worried about it.
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Old 01-01-2011, 12:35 PM
jack7481 jack7481 is offline
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Default Re: qustions about oil in the DIFF.

The haynes repair manual says 4x4 use front 80w90-back gl5 sae 90 Hypoind lubricant.Also why does the back DIFF. cover plate does not have a drain plug? it has 1 in the back but when I check the oil level the gears were in the way why? I never ran into this with my other trucks.
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Old 01-02-2011, 08:14 PM
sgtsandman sgtsandman is offline
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Default Re: qustions about oil in the DIFF.

Not having a drain plug is not that uncommon I'm sorry to say. Another member replaced his back one with a cover that did but I forget where he looked and what the cost was. I don't know if there is anything available for the front.

As far as the fill plug it is right there where the main gear is, so you will touch the gear. If memory serves, the fluid level should be just below the drain plug but since it's hard to gauge the proper level, I go with the "if it's dripping out the hole, it's good" theory. I know it hasn't been under serviced then and that little bit of extra fluid won't hurt anything.
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Old 01-02-2011, 08:16 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: qustions about oil in the DIFF.

Ford isnt the only company to not have a drain in the diff cover. Check your owners manual.
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  #7  
Old 01-02-2011, 08:54 PM
jack7481 jack7481 is offline
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Default Re: qustions about oil in the DIFF.

I guess I'L go with what you said, just dripping out and call it good.
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  #8  
Old 01-02-2011, 09:32 PM
mdblitz mdblitz is offline
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Default Re: qustions about oil in the DIFF.

HI JACK:

Axle code on the door tag will tell you if limited slip or not. Additive is necessary if it is. You can just put a pan under the pumpkin and remove the cover to drain. A new gasket and RTV, refill with proper lube and just stick a finger in the plug hole after refil. Should get it wet.
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Old 01-02-2011, 10:08 PM
MooDib MooDib is offline
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Default Re: qustions about oil in the DIFF.

Make sure you have the correct type of oil needed as well. When changing mine I found out the fx4 takes a special type (75W-140 I believe) that none of the other models did. Also, sgtsandman is right in that you fill it up until it comes out of the fill hole.
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  #10  
Old 01-04-2011, 01:12 PM
jack7481 jack7481 is offline
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Default Re: qustions about oil in the DIFF.

Thanks alot for the info - the other day I changed the back DIFF.pulled the cover off and let drain,glad I did! the oil was as black as shoe polish!.Had a hard time filling with oil in the hole on the housing next time I will change the cover to one the has a filler hole found one at autozone for 18.99 also have to buy a pump for the front.

the oil I used valvoline 80w90 dura blend syn.
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  #11  
Old 01-04-2011, 03:05 PM
mdblitz mdblitz is offline
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Default Re: qustions about oil in the DIFF.

Cool
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