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Unread 09-16-2013, 10:23 PM   #1
Dake
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8.8 limited slip what oil?

What are you all running in yours and do you need to add the friction modifier?

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Unread 09-16-2013, 10:25 PM   #2
rykemc
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Yes. Ford recommends using their additive.
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Unread 09-16-2013, 10:25 PM   #3
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Unread 09-16-2013, 10:26 PM   #4
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I ran plain 70-90 gear oil. No synthetic, no friction modifier.

Same as i did in my mustang back in the day. We would add the FRPP clutch packs and skip the modifier. All the friction modifier does is make the fluid "slippery" and allow the clutches to slip easier. Some people report issues of the clutches chattering but I never had an issue with it.
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Unread 09-16-2013, 11:05 PM   #5
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I read some people on here filling it all the way to the front plug. Is this right? I had picked up some Lucas SAE 75W-90 Synthetic not sure if this is what I need after reading on here.
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Unread 09-16-2013, 11:10 PM   #6
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Depending on your pinion angle and diff cover, you'll need to adjust the amount to cover your gears and lubricate the pinion. Some fill it to the brim. I fill it through the abs hole at the top til it comes out the front hole and then plug it off and give it a little more.

I wouldn't use the expensive stuff in the diff if you're gonna break in the gears and clutch packs. Or if you're like me and have water crossings that cover the front differential.
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Unread 09-16-2013, 11:27 PM   #7
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Before putting the ARB in mine, I ran straight gear oil no additives. Well even after I still run it that way. I just meant when it had limited slip.
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Unread 09-17-2013, 12:23 AM   #8
ashland82391
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Just got an 8.8 today and there was a metal tag right on it saying to use only 75w140
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Unread 09-17-2013, 08:16 AM   #9
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Typically an LSD uses a friction modifier. The instructions that came with the Ford Racing LSD specifically stated to use non synthetic with a modifier. You can buy oil with or without it. You add the minimum at first and adjust based on how much chatter you get around corners.

I had a couple of bottles of Red Line's modifier left over from the race car so I bought 4 qts of NAPA 80W-? and added it per the instructions. There's a little chatter around sharp corners so it should be just right.

IMHO don't use a synthetic for break in oil.
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Unread 09-17-2013, 10:31 AM   #10
roadyrob
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my 8.8 LS has a tag saying 75-90 synthetic, its out of a 99 mountaineer. fords recomended fluid must have changed with different years.
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Unread 09-17-2013, 11:51 AM   #11
tom_sprecher
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Maybe the carbon discs in the Ford Racing part don't like synthetic.
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Unread 09-17-2013, 06:29 PM   #12
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Quote:
Originally Posted by ashland82391 View Post
Just got an 8.8 today and there was a metal tag right on it saying to use only 75w140
Mine had the tag! I had just took it off with out looking at it. That's what I filled it up with. Added the additive I got from advance auto. We see how it goes. l
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