Differential Fluid
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Laughing Gas
Joined: Aug 2003
Posts: 836
Likes: 9
Differential Fluid
I have a 1999 F250 2WD automatic transmission Super Duty with Limited Slip Differential. The truck has 66K on it. I recently had the rear differential completely rebuilt except for the ring and pinion...They said they were in good shape. One carrier bearing was toast and the other pitted. I also replaced the axle bearings. I get a little noise howl at a certain speed from the rear differential. Around 55 mph. They said I may get a little noise because the ring and pinion will not be running exactly in the same place. I have a camper shell on so the noise could be amplified.. They used a synthetic without a additive said I did not need it with Syn?
What should be running in my limited slip differential for fluid? Something that will be good for the limited slip and make thinks run a little quieter.
While I am at it one is recommend for my automatic trans?
Why did the rear carrier bearings go bad with such low miles you ask? Can't say except that the truck sat alot before I got it...
thanks for any input..
What should be running in my limited slip differential for fluid? Something that will be good for the limited slip and make thinks run a little quieter.
While I am at it one is recommend for my automatic trans?
Why did the rear carrier bearings go bad with such low miles you ask? Can't say except that the truck sat alot before I got it...
thanks for any input..
Postmaster
Joined: Mar 2001
Posts: 4,968
Likes: 3
From: So Cal
The way to tell if you need additive is to make tight very slow turns. I find that backing out of a parking spot is very good for detecting differential chatter.
Diff chatter feels like your tires are rubbing or catching on the wheel well. If it chatters you need LS additive.
It usually comes in big toothpaste tubes. On my F250 with Sterling diff it take about 2 tubes for a complete fluid change. Don't add too much since then you go too far on the slippage.
Good Luck,
Jim Henderson
Diff chatter feels like your tires are rubbing or catching on the wheel well. If it chatters you need LS additive.
It usually comes in big toothpaste tubes. On my F250 with Sterling diff it take about 2 tubes for a complete fluid change. Don't add too much since then you go too far on the slippage.
Good Luck,
Jim Henderson
Senior User
Joined: Feb 2007
Posts: 208
Likes: 1
you can also buy the friction modifier from a ford dealer I think I paid like six bucks for the bottle and that stuff fixed up my 10.25 when it was chattering... i'd start with one bottle first and see if that does it... but the noise could also be from when they rebuilt it they might of had to re-shim the diff and it may be a little on the tight side... if thats the case the noise will go away when it gets a few miles on it
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