limited slip, No, its a limited grip! - Ford Powerstroke Diesel Forum
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Old 03-14-2012, 08:02 AM
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limited slip, No, its a limited grip!

I can't express the importance enough to anyone who changes their own oil that YOU HAVE TO USE THE RIGHT S#!T... The correct gear oil AND friction modifier in your rear end. Several years ago on a rainy day I changed the oil in the rear end of my company truck and about 30,000 miles later I was at the Ford dealer signing a $1,600 ticket for a new rear end.
Lately on my personal truck, I've noticed some chatter going around turns and I started to think. The privious owner did all of his own work, and clearly wrote down in the book that he did both front and rear difs at 100,000. So the other day I pulled the cover, cleaned everything and filled it back up with some good correct gear lube and the friction modifer and spent a few hours last night driving around and randomly doing slow motion donuts in a few parking lots enjoying my chatter free rear end. Do your homework boys and girls, these super dutys are like big sensitive bullies!
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Old 03-14-2012, 08:15 AM
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I disagree, If you hear just occasional chatter (tight turns, dry pavement, especially up a steep hill) then, and ONLY then, is your Limited Slip right.

If you are currently "chatter free" your LS isn't working (wait till next Winter and you'll be missin' it ) because the amount of modifier Ford recommends actually disables the clutches from working as they should. I believe Ford does this to limit customer complaints about the chatter noise and ensure the clutches make it past the warranty period.

The way I have Always set the ratio of FM to fluid is to put just a couple of oz.s in then, in a dry parking lot do tight turns and add a couple more until the chatter is almost gone (again, full-lock turns on dry pavement, never hearing chatter otherwise) to know it's right.

I have never put the, ridiculous, 8oz.s Ford recommends but, my LS actually works! I read Many people complain in this forum how they are "One Wheelers" with their LS. My guess is, you're about to join them....
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Old 03-14-2012, 08:22 AM
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my limited slip sucks maybe I should change the fluid and add less FM, how much do you use 6 oz?
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Old 03-14-2012, 08:43 AM
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I'd do just what I said. I think it has to do with how strong the springs still are and the condition of the frictions (clutches), they're not all the same....

Change it with a fluid without the FM and put 2oz.s in and try it! Then add maybe 2 at a time until it's still working some (as evidenced by a tiny bit of chatter) and see it come back to life - maybe...
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Old 03-14-2012, 08:48 AM
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I must be misinformed I guess, I was under the impression that they are supposed to act like a regular rear end and only fully lock under extreme load. Like not allowing a wheel to spin free and out of control while pulling a trailer. Unlike the GM bomb that locks when one wheel spins free. My bad..
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