Locker rear end and posi track, difference???

[Bofire]

Jackelope and car heads, what is the difference??
Carl

[jnevs23]

Lockers have power to both wheels at all times and posi shifts it depending on slippage?

[Buckewe]

With a locker both wheels will spin at the same speed. With a posi it allows the wheels to turn at differenthe speeds. When turning the inside wheel needs to turn slower than the outside . I'm sure someone will give you a more technical answer.

[Duckslayer89]

Wouldn't that be limited slip if it could alternate tire speed? I thought POSI was same as having a locker but I'm no mechanic

[papisjeep]

most limited slips uses clutches and sense slippage then lock up
most lockers spin tires equally

[jackelope]

most limited slips uses clutches and sense slippage then lock up
most lockers spin tires equally

 

Lockers are pretty much both axles/wheels are locked up all the time.
Detroit Locker, etc. Popular in hot rod, race car, drag car scenarios. Both tires are grabbing, hooking up and launching, but you don't have to worry about turning. Turning with a locker sucks.
Air lockers are cool, where you can engage and disengage them when needed.

[WapitiTalk1]

most limited slips uses clutches and sense slippage then lock up
most lockers spin tires equally

This    My 68 Chevelle did not have a POSI rear end so I went with a Yukon Locker last spring... made a WORLD of difference with that 454 churning.  In the end, it was less expensive to go the locker route than to buy an old POSI rear and have it rebuilt, and, it is arguably stronger than a POSI? 

Here's a brief description of the Yukon setup:

Features
•Hook up with the ultimate mechanical positive-locking differential—Yukon Gear & Axle Grizzly Lockers
•Perfect for street, off-road, drag racing, circle track
•Provides 100% power to both tires while allowing disengagement for turns
•Inner clutch teeth feature a larger base radius, improves strength over back-cut designs
•Larger teeth avoid breakage against shock-loading and during axle breaks
•Crafted using state-of-the-art equipment and manufacturing techniques
•All internals are hand fitted, for faster engagement
•Forged 8620 case & 8620 triple-alloy internals for maximum strength
•Quality construction and patent-pending design greatly reduce the chance of common locker failures
•Proudly assembled in the USA

[jackelope]

Wouldn't that be limited slip if it could alternate tire speed? I thought POSI was same as having a locker but I'm no mechanic

With a locker both wheels will spin at the same speed. With a posi it allows the wheels to turn at differenthe speeds. When turning the inside wheel needs to turn slower than the outside . I'm sure someone will give you a more technical answer.

Limited slips allow 1 tire to spin at a different speed than the other IE when you go around a corner...the inside tire is not spinning at the same speed as the outside tire. In a low traction situation, the clutches in the rear diff will lock the 2 axles up turning both rear wheels together for added traction. They sort of give a little until the power is put to them.

[Shank]

1st posi-traction is a blanket term used for an "LSD" (limited slip differential) GMC/Chevy originally coined the term.
Chrysler term is sure grip
Jeep tru-trac
Blah blah blah
"LSD" are some form of traction adding device to the diff, be it clutches, or gear type, or what have you. It's the hop you feel on wet roads going around corners. They are factory installed because they are driver friendly and do give and allow the wheels to spin independently.
If your really stuck a LSD will help, but will end up just spinning the tire with the least amount of traction.
A locker is....well a locker
Meaning both axle shafts are locked
Both tires spin the same speed regardless of anything....and if they do spin at different speeds....you have problems!
When your really stuck... Both tires will spin..even if one is in the air
They are not factory installed (with a couple exceptions) due to there handling characteristics. Noisy, tire wear/scrubbing, excessive loads on drivetrain components. And unpredictable handling...
That's what I think I know about the two

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[HUNTINCOUPLE]

I Googled it one time and found a good video with explanation of the two.

[Bofire]

What is the rear end in my truck? 2015 2500HD chev?? It says on the window sticker "locker" rear end it comes with the trailer tow package. so is that just a name for an old "posi" track or "limited" slip type rear end?
thanks

[Skillet]

Posi is a GM term for a passive differential limited slip system using spring loaded clutches on the spider gears. 
A locker is a positive locking device, using either air pressure or a dog and ratchet design.  Detroit Lockers are famous for their ratcheting sound when turning around corners.
A spool is a third member that permanently locked the axles together by design.
A poor man's spool is simply welding the spider gears together. 

[Bofire]

thanks, I got out my window sticker and it says "automatically locking differential"   ?
Carl

[Pinetar]

I have front and rear lockers on my truck. They are great in certain conditions and really really bad in others. Like icy slanted roads, it will just walk right off the road. You are better off to not have it locked up so you have one tire front and rear that is not spinning so it keeps you on the road. Plowing thru deep snow with 4 chains it is amazing where it will go!

When I have them all locked up it steers just fine.

[Special T]

One thing not said about the difference between lockers and LSD. Lockers provide 2 tires turning the same ammount under load or while on the gas. They ratchet or allow different speeds while coasting around turns. This is why you hear tires chirp under load around corners.
LSD require wheel spin on one tire to engage the clutch in the rear end. Going around a corner under load wont engage but lighting them up will. You can tow a trailer with a LSD. Many are particular about the kind of rear end oil and additives used to get the proper ammount of slip and engagement. I know this because one of my dodge one ton trucks had an LSD that I blew the rear end in because I used the wrong oil additive.  Do NOT use a detroit, Lock Right spool or other mecha ical locker if towing a load. You will  eat up your rear end and tires. An air locker like an ARB or cable actuated OX locker or eletric acuated locker like found in some newer toyota and lexus suvs are the best of all worlds for on/off road.
If this is a mostly road truck get an air/cable locker for the best of both worlds.

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[jackelope]

What is the rear end in my truck? 2015 2500HD chev?? It says on the window sticker "locker" rear end it comes with the trailer tow package. so is that just a name for an old "posi" track or "limited" slip type rear end?
thanks

Look at the option codes in the bottom of the glove box. Limited slip is g80. Is it listed there?

[Magnum_Willys]

Detroit Locker - both tires lock together except corners where outside tire can ratchet free to turn faster than inside tire.  Best for anything hardcore where a tire may come off the ground which limited slips dont do so well.  No clutches to wear, generally bulletproof except when turning with heavy trailer loads at slow speed.

G80 - Limited  Slip - Gov Locker:  GM limited slip that has a spinning weight that engages a pawl that will lock the axle shafts if one side starts spinning faster than the other.  Also called Gov-Bomb since it can be subjected to heavy forces at times. 

LSD/Posi - Auburn, Power-Lock, Trak-lock:  Clutch type - Always locks axles but clutches allow slip around corners - but also allow slip if one tire in air or on ice.  Slip can be overcome with tapping breaks to a degree.  The discontinued Power-lock had the advantage of clutches locking harder as the load increased.

Airlocker - Like a spool but can be unlocked to be an open rearend.   Problematic at times due to air leaks and have to live with spool characteristics when locked.

An air-locked Detroit would be perfect but alas it doesn't exist.

Offroad I like a Detroit in the rear and a power-lock up front.   

On-road I run an Auburn LSD in the rear of my Ram 1500

Even with lockers you need a winch sometimes !

[Pinetar]

Pretty sure I have seen this pic on here before? Great pic! Nice rig

[Shank]

Detroit Locker - both tires lock together except corners where outside tire can ratchet free to turn faster than inside tire.  Best for anything hardcore where a tire may come off the ground which limited slips dont do so well.  No clutches to wear, generally bulletproof except when turning with heavy trailer loads at slow speed.

G80 - Limited  Slip - Gov Locker:  GM limited slip that has a spinning weight that engages a pawl that will lock the axle shafts if one side starts spinning faster than the other.  Also called Gov-Bomb since it can be subjected to heavy forces at times. 

LSD/Posi - Auburn, Power-Lock, Trak-lock:  Clutch type - Always locks axles but clutches allow slip around corners - but also allow slip if one tire in air or on ice.  Slip can be overcome with tapping breaks to a degree.  The discontinued Power-lock had the advantage of clutches locking harder as the load increased.

Airlocker - Like a spool but can be unlocked to be an open rearend.   Problematic at times due to air leaks and have to live with spool characteristics when locked.

An air-locked Detroit would be perfect but alas it doesn't exist.

Offroad I like a Detroit in the rear and a power-lock up front.   

On-road I run an Auburn LSD in the rear of my Ram 1500

Even with lockers you need a winch sometimes !

Beautiful looking truck!
Told the wife one of these days I'd like to build one, for here to cruise around in

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[bhawley76]

What is your plan, what are you building? I have a old bronco that's got Detroit's front and rear and if I was to do it again I would go with a limited slip in the rear just to keep from eating tires.

[Born2late]

I have a 98 -1/2 Dodge cummins long bed, 4x4,extended cab with a detriot rear end. I tow heavy every day with Either a flatbed or a 16 enclosed trailer full of granite.My experience with it has been great as far a durability and traction goes ( have over 200,000 on reared). Keeping tires on it is another story. I've yet to get a set of four to last me past 42,000 miles. It eats them up really fast. Michelins were the worst by far. Toyo at second worst. toyo mts better but sucked for traction. I'm trying master craft courser mst and they have been the best for traction so far but will see how they hold up.

[Bofire]

yep  g80 is there, Jack
Carl

[b23]

True Detroit lockers are a full spool under power.  Off throttle they are open.  If they're working properly, under power, they never differentiate or slip, meaning they won't allow one wheel to turn faster than the other.  If you go around a corner and are on the throttle it's locked up and the inside tire will skip, scrub, chatter, or whatever you choose to call it because the outside and inside are locked together and the outside tire is forcing the inside to spin at the same speed which it can't because it traveling a shorter distance.

Circle track cars like DL's because when you're pushing the car around the pits it's an open rear end and MUCH easier to push a car around with a DL than a spool but out on the track it's mostly a spool.  I say mostly because a DL reacts a little different on corner entry than does a spool but once you get used to it a DL gives you the best of both worlds, except the DL has quite a bit more rotating weight than does a spool.

A true Detroit Locker wouldn't really be the most user friendly unit for a daily driver.  If you must have a locker type rear carrier in your daily driver something like an air locker is going to be much more friendly to drive.

As for the electronic "Locker" units that come from the factory in the Toyota or Jeep, I'm not exactly sure how they work, electromagnetic maybe.  I've got one in my Toyota Tacoma and the Jeep Rubicon I had before the Tacoma had them front and rear.  They work fine but unfortunately, both, will only engage if you're in four low and when I had my Rubicon locked up all the way around, you could hardly steer the d*mn thing, it just wanted to go straight.

Limited slip differentials, depending on the unit, are definitely better than open diffs but they're certainly not a locker.  I had a friend that shimmed the springs in the limited slip unit he had in his old style Bronco and it worked very well but it also wore out the disks much faster too.

[huntandjeep]

Detroit's suck for a daily driver. Had quite a few rigs with them . With a fully locked front the front is harder to steer unless you can unlock a hub. My old Jeep was Detroit's f/B and I usually ran around with 1 front hub unlocked so I could turn on the tight trails. I went with ARB's front / rear in my current Jeep.

[b23]

A poor man's spool is simply welding the spider gears together.

Many years ago my folks had an aquaintance who was an older fella that was a member of the Yakima Ridge Runners.  I got to talking to him about jeeping and what we each thought were the best years, best motors, best differentials, etc. and he asks me if I've ever heard of a  "Lincoln Locker".  Having never heard of such a thing I said a what?!  He was kind of a jokester and he could tell I didn't have a clue what he was talking about so he played it up like I was an idiot for not knowing what the he11 a "Lincoln Locker" was so I finally asked him, ok what the heck is a Lincoln Locker.  He says well, a Lincoln locker is just like a Miller Locker or a Hobart Locker.  Ok, now I'm full on confused but I'm dying to know what these things are, when it hits me.  Ohhhh, I get it you weld up the spider gears with a Lincoln, Miller, or Hobart welder and that's your "Lincoln Locker".

[BigGoonTuna]

with most lockers, they will let one wheel spin faster than the one receiving power from the driveshaft.  an open diff will let the wheel with the least amount of traction spin slower.

with a limited slip(or posi as they're usually called) you get more traction than an open diff, but never really a full lock up like a detroit.

the trick to driving with a locker is to get off the throttle(or push in the clutch if you drive a real truck) when you go into a corner.  that lets the outside wheel unlock and ratchet.  makes getting into parking spaces interesting sometimes.

[gonehuntin68]

most limited slips uses clutches and sense slippage then lock up
most lockers spin tires equally

This    My 68 Chevelle did not have a POSI rear end so I went with a Yukon Locker last spring... made a WORLD of difference with that 454 churning.  In the end, it was less expensive to go the locker route than to buy an old POSI rear and have it rebuilt, and, it is arguably stronger than a POSI? 

Here's a brief description of the Yukon.

Features
•Hook up with the ultimate mechanical positive-locking differential—Yukon Gear & Axle Grizzly Lockers
•Perfect for street, off-road, drag racing, circle track
•Provides 100% power to both tires while allowing disengagement for turns
•Inner clutch teeth feature a larger base radius, improves strength over back-cut designs
•Larger teeth avoid breakage against shock-loading and during axle breaks
•Crafted using state-of-the-art equipment and manufacturing techniques
•All internals are hand fitted, for faster engagement
•Forged 8620 case & 8620 triple-alloy internals for maximum strength
•Quality construction and patent-pending design greatly reduce the chance of common locker failures
•Proudly assembled in the USA

I also have a 68 chevelle. Coolest muscle car ever. 

[b23]

I also have a 68 chevelle. Coolest muscle car ever. 

I'm not really even a GM guy but I'd have to 100% agree. 

Probably the biggest baddest "production" muscle car ever built was the 1970 Chevelle with the LS6 454.  Those things were a monster!