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Old 03-22-2013, 01:35 PM   #1
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So open differential...

Looking to get 3.55s. Shop wanted to be sure if the car was an open or posi rear end. Thought it it was a posi. Looked it up. Maybe something like a t lock which acts as the same. You can do a burn out which means its NOT an open. But I give the vin number to the shop and they look it up and tell me it's an open differential... What do you guys think
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Old 03-22-2013, 01:43 PM   #2
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What year?
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Old 03-22-2013, 01:44 PM   #3
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2011 up mustangs all have LSD
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Old 03-22-2013, 01:55 PM   #4
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2011

---------- Post added at 10:55 AM ---------- Previous post was at 10:53 AM ----------

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2011 up mustangs all have LSD
So it's not an open and it would be fine for a gear change
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Old 03-22-2013, 03:56 PM   #5
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2011

---------- Post added at 10:55 AM ---------- Previous post was at 10:53 AM ----------



So it's not an open and it would be fine for a gear change
Why would they wanna know this anyway? Gears are gears. Been doing swaps for year now
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Old 03-22-2013, 04:09 PM   #6
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Why would they wanna know this anyway? Gears are gears. Been doing swaps for year now
In an open diff your car would just lose traction
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Old 03-22-2013, 08:32 PM   #7
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Limited slip. Not posi, not open
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Old 03-22-2013, 08:50 PM   #8
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Yep, as stated, it's a clutch-type limited slip differential. It's not open, they're smoking crap. Wouldn't surprise me if they're telling you this in order to sell you something else.
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Old 03-22-2013, 10:58 PM   #9
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Yep, as stated, it's a clutch-type limited slip differential. It's not open, they're smoking crap. Wouldn't surprise me if they're telling you this in order to sell you something else.
That's what I was afraid of. I thought I finally found a good place.
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Old 03-22-2013, 11:06 PM   #10
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Posi is the nickname GM gave traction lock... Each company calls it something different. Ford uses Traction lock, GM uses posi.... But yes you have Traction lock.
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Old 03-23-2013, 12:20 AM   #11
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So, when my dad says that it has to roll back or forward some to fully catch the two wheels, is he correct? Also said posi is for Chevy termed and will chirp the outside tire in a turn
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Old 03-23-2013, 01:10 AM   #12
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It is my understanding (and I'm no expert). But I believe posi is when both wheels spin at the same speed all the time. LSD is when more power is distributed to the inside wheel on a turn for better cornering. I've also heard many people say that's it's GM's phrase and such but I thought there was an actual difference between them. Right? Wrong?
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Old 03-23-2013, 01:51 PM   #13
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It is my understanding (and I'm no expert). But I believe posi is when both wheels spin at the same speed all the time. LSD is when more power is distributed to the inside wheel on a turn for better cornering. I've also heard many people say that's it's GM's phrase and such but I thought there was an actual difference between them. Right? Wrong?
The double wheel power feature is called many things but I thought it was posi/whatever else or the lsd. Then what's a live and open axle?
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Old 03-23-2013, 02:54 PM   #14
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Live axle refers to the whole axle assembly, if you look at your axle it is one straight bar the goes from wheel to wheel, this is not the best for cornering as the wheels are essentially connected together and when one tire hits a bump the entire rear end gets a jolt. then there is independant rear axles which each tire moves independent of one another, open axle refers to not haveing a LSD or posi or whatever, only one tire gets power
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Old 03-23-2013, 03:11 PM   #15
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The "posi track" name is what GM calls it. Ford calls it "trac lock". American Motors called it "true lock". And if you want one from Europe, Alfa Romero calls it "Q2". All different names for what is actually by definition a Limited Slip Differential. Each company has their own unique ways of making it work. Ford uses a clutch system which has proven to be reliable over the years, especially in a 8.8 format.
Differentials that always apply power equally to both wheels are termed as "lockers", with the most common being a Detroit Locker. These are used in racing and offroad vehicles.
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Old 03-23-2013, 03:26 PM   #16
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Regardless of all the terms for the differentials. The shop still claimed that ford said I had an open diff from my bin number. Which is BS because I just jacked my car and turned the tires and they both went the same way.
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Old 03-23-2013, 03:30 PM   #17
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So 2011+ are posi or whatever it's called
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Old 03-23-2013, 03:31 PM   #18
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So 2011+ are posi or whatever it's called
Limited slip, but LSD is more like a posi then an open diff
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Old 03-23-2013, 06:59 PM   #19
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Limited slip, but LSD is more like a posi then an open diff
Either way. It's better than my new edge 02 rear end lol sorry I had to
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