What axle is this and fluid - Ford Powerstroke Diesel Forum
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Old 12-24-2011, 09:19 AM
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What axle is this and fluid

I have a 99 4X4 dually diesel. I changed fluid in my rear axle a while back and was told not to put an additive in it by someone, so I just put mobile 1 synthetic gear lube in it. (75W-140). My truck also has a shake or shimmy when I'm turning and is really noticeable in a parking lot, going both forward and backwards. Almost like the rear tires are bumping or sliding across the payment, if that makes sense.

I took pictures of my rear axle so hopefully someone can tell me what I have or if I needed an additive as well. It looks like I have a 4.10 limited slip. Or what could be causing the shake.
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Old 12-24-2011, 09:30 AM
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I have the same truck, you need additive. IIRC you need 3 posi trac bottles from ford. And you Need at least 3 I only put two once and had what you have in parking lots.


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Old 12-24-2011, 09:52 AM
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This is a link to the '99 Owner's Manual.
http://www.motorcraftservice.com/pub.../99f23og4e.pdf

Page 212 - talks about the axles and fluid capacity. It shows reference to notes 1,2,3. Those notes are on page 214. Note 2 describes the addition of a friction modifier. The part number is shown there.

On page 212, it describes the axles. It may help you figure out what axle you have.

Hope it helps. Good luck.
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Old 12-25-2011, 03:09 AM
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I put the additive in and I still have the popping. I say popping because I had someone drive my truck backwards while turning and you can hear a popping about every second and feel and hear the truck pop in the rear end but I can't see anything. I wonder if it's my drive shaft or U joints. They all feel tight except about a couple of feet from the front where there's a rubber support around the drive shaft that when I push up on it, it moves about an inch. Is that normal? Any ideals?
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Old 12-25-2011, 06:49 AM
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The popping happens while backing and turning. The truck used to pop going forward while turning but that has stopping since I put the additive in yesterday.

Should I give it a while to see if the popping while backing stops after adding the additive yesterday. I added 7 ounces.
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Old 12-25-2011, 08:33 AM
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Quote:
Originally Posted by nathan619 View Post
I put the additive in and I still have the popping. I say popping because I had someone drive my truck backwards while turning and you can hear a popping about every second and feel and hear the truck pop in the rear end but I can't see anything. I wonder if it's my drive shaft or U joints. They all feel tight except about a couple of feet from the front where there's a rubber support around the drive shaft that when I push up on it, it moves about an inch. Is that normal? Any ideals?
That rubber support is called a carrier bearing and yes it needs to be replaced. It should have little to no movement.
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Old 12-25-2011, 10:04 AM
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I would replace the u joints aswell. No reason to take the driveline off twice.


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