What axle is this and fluid

[nathan619]

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.

[Jomax]

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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[SuperCrutyPS]

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.

[nathan619]

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?

[nathan619]

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.

[mgassel]

Originally Posted by nathan619

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.

[Jomax]

I would replace the u joints aswell. No reason to take the driveline off twice.


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