Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Locker Vs. Limited Slip Vs. Open

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Old Oct 27, 2005 | 04:21 AM
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Default Locker Vs. Limited Slip Vs. Open

ok...a locker is Posi....an Open is rear right wheel...and a limited slip is what??? does it slip then kick into posi or the other way around or what?

is it possible for dual wheel burn outs or just one? info on them...i gotta find out what they do exactly once and for all.
Old Oct 27, 2005 | 04:56 AM
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Default RE: Locker Vs. Limited Slip Vs. Open

did it ever bother anyone that the "Bullitt" mustang in the movie had an open rear end? that ticks me off for whatever reason....just not as cool i guess....


is there a difference between a "Detroit Locker" and a regular locking rear end?
Old Oct 27, 2005 | 07:30 AM
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Default RE: Locker Vs. Limited Slip Vs. Open

A limited slip is a positraction rear. I would take about 6 pages to tell about the differences, so will just refer you to this instead. http://auto.howstuffworks.com/differential.htm
Old Oct 27, 2005 | 10:22 AM
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Default RE: Locker Vs. Limited Slip Vs. Open

Basically a limited slip, allows the wheel to slip a certain number of revolutions and then engages for traction. The limited slip is quieter verses the locker.
Old Oct 27, 2005 | 11:07 AM
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Default RE: Locker Vs. Limited Slip Vs. Open

The traction lock (limited slip) has clutches that allow one axle to slip slightly in turns. The Locker is a spring loaded gear that loads the spring while turniong and make a clicking noise. The locker is pretty aggresive for the street.
Old Oct 27, 2005 | 12:40 PM
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Default RE: Locker Vs. Limited Slip Vs. Open


ORIGINAL: Shifty101Easy

ok...a locker is Posi....an Open is rear right wheel...and a limited slip is what??? does it slip then kick into posi or the other way around or what?

is it possible for dual wheel burn outs or just one? info on them...i gotta find out what they do exactly once and for all.

For your question on the one wheel burnouts like the one guy said it will spin for a certain number of rotations and then lock in so what will happens is it will start with two and then one...depending on what type of limited slip it is it might not spin at all....the main thing about limited slip verses the rest is that going around a corner the one wheel spins faster than the other....thus a full locked rear end will result in tire spin around corners....limited slip corrects that by slowing the inside wheel down so the outside wheel can spin the speed that is has to, to get you around the corner....so if you were to cut the wheel and punch the throttle to try to spin out you are going to look dumb because it not going to do anything..
Old Oct 27, 2005 | 08:20 PM
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Default RE: Locker Vs. Limited Slip Vs. Open

so a locker isnt very good choice for a mustang...a limited slip is probably the best i assume?


do you mean it will allow both wheels to burn out for a few revolutions first and THEN one wheel will stop and get traction basically?


whats the best kind of rear end for a mustang that accomplishes this then??

were most mustangs outfitted with open or posi rear ends?


what do the 2005-2006 mustangs have?
Old Oct 27, 2005 | 09:06 PM
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Default RE: Locker Vs. Limited Slip Vs. Open

no,with a posi the clutches lock up in an instint...bepends on the wear of the clutches..
Old Oct 27, 2005 | 09:25 PM
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Default RE: Locker Vs. Limited Slip Vs. Open

my friend has posi in his camaro...its probably one of the top 5 fastest cars in the city limits and last winter when he was goin around a corner at a 4 way intersection he hit the gas a little too much and the rear end just spun out and slammed into a some ladys brand new Mercedes S500....

long story short....his new frame just came and now hes transfering everything over to the new frame at the moment.


so the moral here is a locker (posi) will look cool for burnouts and straight aways but for cornering and handling and what not its not going to be as good as a limited slip for cornering and handling?

i think i understand the difference between the 3 but they all seem to have pro's and con's that are somewhat major....i know i wouldnt want an open rear end...and a locker dosent sound that practical or safe....so a limited slip is the best of both world more or less?
Old Oct 28, 2005 | 01:53 AM
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Default RE: Locker Vs. Limited Slip Vs. Open

Ford has a Locker that was available in a 9". It had lugs that were spring loaded and when you turn a corner it would make an audible clicking noise as the lugs disengaged and reengaged. It may be available for other rears, I havent put any in 8.8's.

Limited slip/posi/Suregrip/SafetyTrack are all locking type differentials. They use either cones or clutches to distribute power evenly to both wheels unless you are turning with no power applied. If you add power it will clock the clutch or cone and both tires will get powered, in a low traction situation, ie snow ice or rain, the rear end will swing out. Its something to be aware of when driving ANY rear drive vehicle with a locking type diff. These dont make any noise unless there is something wrong with them.

Torsen diffs use gears to even the power, but they dont have the torque capacity of the above diffs. They work well in road racing where you need to apply power late in a turn and not oversteer.

An open rear has no clutches and if you have enough power to spin the tire, the passenger side rear will spin first. Also in wet ice and snow, only one wheel will turn. Doesnt matter if its turning a corner or not, because it sends power to the tire with the least traction. If you have a daily driver and dont really care about getting it moving under WOT, then this is a cheap diff for that purpose. They suck for drag racing.

The Locker has the most torque capacity, and the only drawback is the clickin noise that some people find objectionable. I could never hear mine over the exhaust anyway.

A full spool is just that, no differential action. Both tires ALWAYS turn the same speed as the axles are locked together. These are known to break axles and cause the inside tire to chirp as you turn. Only full on drag cars and guys who can put up with alot of ill handling use them. They are hardcore race parts and not really intended for the street, but with care they can be driven some.

Thats about as simple as I can make it, hope it helps.



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