Rear LS Differential Gear Oil (used appearance) - Diesel Forum - TheDieselStop.com
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post #1 of 16 (permalink) Old 05-19-2018, 03:28 PM Thread Starter
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Rear LS Differential Gear Oil (used appearance)

I just changed the rear Differential fluid in my F250 w/95k. The truck has a 3.73 LS rear end based on the door sticker (axle 3L). I used a fluid evacuator to draw the fluid out of the fill port.

The fluid I removed had some gray material (graphite?) suspended in it. Was this normal for a limited slip differential? Perhaps material from the friction discs or clutch pack in the Differential. The fluid didn’t appear to be abnormal in any other way (no water, good viscosity, etc).

Thanks
OJ

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post #2 of 16 (permalink) Old 05-19-2018, 06:51 PM
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Its not graphite. Ground up clutch material is the most likely culprit.


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post #3 of 16 (permalink) Old 05-20-2018, 11:19 AM
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Yup. I would pull the cover and try to get the rest out.
From what I understand, if you fill with a synthetic fluid, you don't need as much/any friction modifier/lsd additive.
You start with just the gear oil, then add the additive to quieten the chatter. But from the sounds of it, your clutches may be toasted anyways. http://www.fourwheeler.com/how-to/tr...-traction-lok/
You could jack one tire off the ground with truck in neutral and see if you can spin the tire. (You shouldn't be able to)

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post #4 of 16 (permalink) Old 05-20-2018, 11:38 AM Thread Starter
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The gray material was only in a small portion of the gear lube I removed (< 0.2 qt). I may pull the cover the next time I do a significant service, but I will prob get an aftermarket Differential cover with a drain port to reinstall.

The OEM cover has cooling fins already, but a drain would of been nice.

I’ll try the LS dif check the next time I have the rear end or wheel off the ground.

Thanks
OJ

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post #5 of 16 (permalink) Old 05-20-2018, 12:12 PM
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You will most likely hear your LS chatter when turning until you add the fluid.

I used a synthetic gear oil and had to add 1/2 the recommended amount (one 4-oz bottle of Ford "friction modifier" XL-3) and then the rear diff quieted down.
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post #6 of 16 (permalink) Old 05-20-2018, 12:38 PM
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If the rear end fluid that you used is synthetic and is rated GL4 then you shouldn't need to add any additional additive.

On the bits you found I agree that they are pieces of the clutches and I can foresee a rear end rebuild in your future.
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post #7 of 16 (permalink) Old 05-23-2018, 09:21 PM
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One form of rust is black, so that's probably at least half of the powder you saw in the oil. It appears in axles with open diffs at the same concentration (for the same age/miles), so it's not necessarily clutch material, and it doesn't indicate impending failure. Just remember to clean the magnet.


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post #8 of 16 (permalink) Old 05-23-2018, 10:05 PM
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I just did this job a month ago and now thinking about the magnet.

I think it was just the FILL plug that was magnetized?

Does that sound right?

EDIT:

Worth a lookover:

http://www.guzzle7pt3.com/rdiff.php

.


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Last edited by ArcticDriver; 05-24-2018 at 11:36 AM.
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post #9 of 16 (permalink) Old 05-24-2018, 04:01 AM Thread Starter
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Quote:
Originally Posted by Steve83 View Post
One form of rust is black, so that's probably at least half of the powder you saw in the oil. It appears in axles with open diffs at the same concentration (for the same age/miles), so it's not necessarily clutch material, and it doesn't indicate impending failure. Just remember to clean the magnet.
The drain plug was magnetized, and there was a little of the same gray material on the end, so that makes sense now. There were no metal shavings or anything alarming.

Is there another magnet in the diff or cover? I would probably have to remove the diff cover to access.

Thanks
OJ

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post #10 of 16 (permalink) Old 05-24-2018, 08:33 AM
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There is not another magnet on the cover - unless you add one. I bought a couple of Neodymium magnets from https://www.kjmagnetics.com/products.asp?cat=1

I got some in the 35 pound range - axially magnetized. I have one on my oil filter and one on my differential cover. They've both been there for the past 100,000 miles. Obviously, I pull the oil filter magnet and move it to the new oil filter each oil change.

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post #11 of 16 (permalink) Old 05-24-2018, 09:23 AM
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I always use synthetic fluid in the diff. I tried without it once and could feel/hear the LS clattering. 4 oz of modifier did the job. I had close to 300,000 on my last 99 and LS still worked fine. I always pull rear cover and take a look, reseal with RTV and let set for a day before refill.
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post #12 of 16 (permalink) Old 05-24-2018, 11:27 AM
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Quote:
Originally Posted by Boating_fool View Post
...a drain would of been nice.
Quote:
Originally Posted by Boating_fool View Post
The drain plug was magnetized...
Was there a drain plug, or not? The FILL plug should have an embedded magnet:


(phone app link)


I put a factory IRS cover on my 8.8" axle, which gave me a cast Aluminum (puncture-resistant) cover, fins, another fill, a drain, & another vent:


(phone app link)


I haven't found a use for the bolt ears yet, but they don't interfere with anything, so I haven't cut them off, either. The closest thing for your Sterling axle would be aftermarket.


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post #13 of 16 (permalink) Old 05-24-2018, 11:35 AM
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Steve83,

Guzzle's link above discusses only a 3/8" Magnetized Fill Plug.

Welcome to guzzle's Rear Differential Maintenance Web Page

I have been working on several pieces of equipment the past month and can't keep them all straight.

Thanks for the correction.

I also agree with DENNY's experience that one 4-oz bottle of Friction Modifier is typically required even when using Synthetic Gear Oil.


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Last edited by ArcticDriver; 05-24-2018 at 11:37 AM.
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post #14 of 16 (permalink) Old 05-24-2018, 12:13 PM Thread Starter
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Quote:
Originally Posted by Steve83 View Post
Quote:
Originally Posted by Boating_fool View Post
...a drain would of been nice.
Quote:
Originally Posted by Boating_fool View Post
The drain plug was magnetized...
Was there a drain plug, or not? The FILL plug should have an embedded magnet:


(phone app link)


I put a factory IRS cover on my 8.8" axle, which gave me a cast Aluminum (puncture-resistant) cover, fins, another fill, a drain, & another vent:


(phone app link)


I haven't found a use for the bolt ears yet, but they don't interfere with anything, so I haven't cut them off, either. The closest thing for your Sterling axle would be aftermarket.
Sorry, I should of said the “Fill plug” was magnetized. There was no drain plug on the OEM diff cover as originally stated. Sorry about that.

OJ
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post #15 of 16 (permalink) Old 05-24-2018, 07:11 PM
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Figure I'll mention it, since it was brought up....
Clutch material won't stick to the magnet...

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2010 VW JETTA TDI DSG Kerma tune. Hankook ventus v2 concept 2.


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