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Old 04-23-2007
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Differential lube replacement

I haven't seen anything on front or rear differential maintenance. (Lots of stuff on replacement etc...) Has anyone actually done this or does everyone assume it will last the life of the truck???

I know my rear LS is starting to get a little loose, I hope its a fluid swap issue, it bites nicely and easily on "loose" surfaces but struggles a little more on harder ones. I know I need to add the FoMoCo friction modifier to mix etc.
However let me get to my questions.

1) What fluid weights and brand are people using in what axle and what result.

(I remember John running Synthetic fluid in his ECTED and having to go back to dino-oil with FricMod for best performance)

2) Any tips for draining and filling the front axle?

3) How many other people have experienced the breather "burp" on the front axle?
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Old 04-23-2007
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I just changed the rear fluid this weekend. I used 75w140 for my Torsen rear end. Was the first fluid change and should have been done at or before 100k. I dont know the lifespan though.

Havent attempted the front yet.
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Old 04-24-2007
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Wow apparently this forum is becoming more and more populated by the "pay someone else to fix it" crowd.

I can't believe that there aren't more people who have done this...it must truly be that people have NO CLUE that it NEEDS to be done!


Pffft
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Old 04-24-2007
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i would say Lucas in the *** end
it comes with the additive, i havn't had a problem yet
i dont have much to say about the front, i took the whole diff out to get to the oil pan.. its only 3 bolts, well plus the ones holding the u-joint

and to your comment, yes i did it
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Old 04-24-2007
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i used Quaker State full synthetic in both my ends......75w90 is what the manual says for the diffs.........if you have a limited slip and you put in a full synthetic gear oil, you don't need the friction modifier adder....
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Old 04-24-2007
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Quote:
Originally Posted by lifted97ranger
you have a limited slip and you put in a full synthetic gear oil, you don't need the friction modifier adder....

Actually, if we can get Daddy Griggs in on this conversation it would help somewhat. I know when he installed his Eaton ECTED it called for dino-oil with friction mod. He decided to use HIS better judgement and used Amsoil full syn...to less than spectacular results...apparently its TOO slippery and the L/S can't engage. (from what I remember of the conversation with John at Centralia)

Anyhoo I was mainly interested in hearing how anyone did the front diff, mainly draining it...???
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Old 04-24-2007
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mine works fine with the synthetic.........i got a Ford Racing L/S unit.....it has had full synthetic on it since it was new....
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Old 04-25-2007
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I used Mobil 1
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Old 04-25-2007
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I use walmart Brand gear oil....
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Old 04-25-2007
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Quote:
Originally Posted by SonicRanger001
Anyhoo I was mainly interested in hearing how anyone did the front diff, mainly draining it...???
For 98+, use a hand fluid pump through the fill hole. That's the factory manual method and the only method if the diff is installed in the truck.

I have Valvoline full synthetic in mine, 80W90 front and 75W140 rear.
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