Limited Slip
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Senior User
Joined: Mar 2006
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From: Rolla, MO
Limited Slip
This is obvious for some but how do you know if you have a limited slip diff? Is it labeled some where or is there an easy way to tell?
I need to service my rear diff and I need to know whether or not I need the friction additive.
I need to service my rear diff and I need to know whether or not I need the friction additive.
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
Look in your door jamb under the word "Axle". "31" is a non-LS 3.73, "C1" is a LS 3.73. If you have 4.10s, I don't know the code off the top of my head, but here's a link where you can look it up:
What is my Ford rear end ratio, do I have positraction - Drivetrain.com
EDIT: 32 & C2 is the 4.10 version of the non-LS & LS, respectively.
What is my Ford rear end ratio, do I have positraction - Drivetrain.com
EDIT: 32 & C2 is the 4.10 version of the non-LS & LS, respectively.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
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From: Grand Lake, La.
If you can't read the tag, jack both rear tires off the ground and turn one tire by hand. If the other tire turns the same way, you have LS, if the other tire turns the opposite way, you have the open rear. 
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From: Rolla, MO
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From: Rolla, MO
Okay I couldn't find crap on the door sticker. So I looked on the tag on the diff. It said L 73 and then a bunch of numbers after that. So is it safe to say I have a LS diff? Does anyone know what the rest of the numbers mean? Is there a website that breaks all that down for you, just curious?
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Joined: Mar 2006
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From: Rolla, MO
Okay, since I found out I have a LS I need to service both diffs.
Everyone has their opinion on what oils they like to use but I'm looking to see the general concensus on a good full synthetic gear oil that doesn't rob the bank along with the friction additive if it's not already in the oil.
Everyone has their opinion on what oils they like to use but I'm looking to see the general concensus on a good full synthetic gear oil that doesn't rob the bank along with the friction additive if it's not already in the oil.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Okay, since I found out I have a LS I need to service both diffs.
Everyone has their opinion on what oils they like to use but I'm looking to see the general concensus on a good full synthetic gear oil that doesn't rob the bank along with the friction additive if it's not already in the oil.
Everyone has their opinion on what oils they like to use but I'm looking to see the general concensus on a good full synthetic gear oil that doesn't rob the bank along with the friction additive if it's not already in the oil.
Cargo Master
Joined: Apr 2006
Posts: 3,215
Likes: 8
From: WV
I just changed mine and used Red Line synthetic oil. Bought it from Summit Racing. It already has the friction modifier in it.
I've used Red Line oils for years in my Mustang, Ranger, and Explorer and so far so good.
I've used Red Line oils for years in my Mustang, Ranger, and Explorer and so far so good.