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Old 03-31-2013, 03:18 PM
If it aint a CAT itsa DOG

 

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limited slip vibration

I have a vibration on my 06 that happens when either you are braking and turning (at slow speeds), taking off and turning, or backing up. It sounds like you are going over a rumble strip or like a tire is rubbing on the mudflap. It seems to be worse after the truck has been driven a while. Rig has 125k on it. Rear diff was rebuilt (the gears) at 94k. I think it might be the limited slip clutches not grabbing properly. The truck is 100% bone stock with 20" oem rims and fx4 pkg. Anyone else ever have this problem? I also just had all the rear u-joints and hanger bearing replaced. It was doing it before that work was done. Could it also be rear drive shaft pitch?
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Old 04-18-2013, 03:14 AM
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I have a 2004 and it does the same thing. I am very interested to hear what people say.


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Old 04-18-2013, 04:59 AM
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Mine does the same thing. I was wondering if the diff lube needs more friction modifier added to it.

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Old 04-18-2013, 02:40 PM
If it aint a CAT itsa DOG

 

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I have been looking into mine a lot. I had a bottle of FM added to it with no change(it wasn't ford brand FM0. I was told that the oil looked very dirty/sludge like. Ford wants $100 for just the oil and FM, so i am debating on what to do. I have heard that aftermarket brand FM's don't always work like the oem friction modifiers do. I purchased a detroit true trac, but am finding that it will cost almost another $600 just to install that! I will let you know what i end up doing.
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Old 04-20-2013, 08:41 AM
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I had the same problem on my 01 f150 before I bought my 350 and I ended up changing the gear oil and put a synthetic gear oil in it and friction modifier. Fixed the problem until about 5,000 miles later it started again so I added another friction modifier to it and never had a problem again. It was the cutches but if you let it go for too long your clutches will be smoked especially if you tow


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Old 04-22-2013, 10:49 AM
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The limited slip clutches are burnt up and need to be replaced. Thats where the chatter is coming from. Just did mine 2 weeks ago. If you want to verify they are burnt jack the rear end up and leave the truck in park and try to spin one wheel, if the other side spins opposite they are junk. You shouldnt be able to spin them if the clutches are good.
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Old 04-22-2013, 05:13 PM
If it aint a CAT itsa DOG

 

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Had them replaced today. I had a ford dealer do it. Came to about $670. I do a lot of commercial work with them so i got a discount on the whole job. Overall i didn't think it was too bad, when other dealers want over $900. Best of all the vibration is gone.
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