What axle is this and fluid - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 12-24-2011, 08:19 AM Thread Starter
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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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99 F-350 CC Dually 4x4. Completely stock.
10 F-350 CC SRW 4x4. Completely stock. (Sold)
16 F-250 CC 4x4. Stock
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post #2 of 7 Old 12-24-2011, 08:30 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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post #3 of 7 Old 12-24-2011, 08:52 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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post #4 of 7 Old 12-25-2011, 02:09 AM Thread Starter
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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?

99 F-350 CC Dually 4x4. Completely stock.
10 F-350 CC SRW 4x4. Completely stock. (Sold)
16 F-250 CC 4x4. Stock
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post #5 of 7 Old 12-25-2011, 05:49 AM Thread Starter
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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.

99 F-350 CC Dually 4x4. Completely stock.
10 F-350 CC SRW 4x4. Completely stock. (Sold)
16 F-250 CC 4x4. Stock
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post #6 of 7 Old 12-25-2011, 07:33 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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post #7 of 7 Old 12-25-2011, 09:04 AM
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I would replace the u joints aswell. No reason to take the driveline off twice.


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2015 CCSB F-250 4x4 6.7 diesel lariat, 24k miles
Carli 2.5in lift Coilover triple bypass system (Dan's old kit), full rear deavers, carli radius arms, raceline clutch 17in,rims, toyo RT 37in tires, vision X 40in light bar, Rigid Q2 driving pattern, rigid DOT fogs
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