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Author Topic: Locker rear end and posi track, difference???  (Read 10345 times)

Offline Bofire

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Locker rear end and posi track, difference???
« on: December 28, 2015, 05:34:33 PM »
Jackelope and car heads, what is the difference?? :dunno: :dunno: :dunno:
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Offline jnevs23

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Re: Locker rear end and posi track, difference???
« Reply #1 on: December 28, 2015, 05:42:02 PM »
Lockers have power to both wheels at all times and posi shifts it depending on slippage?

Offline Buckewe

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Re: Locker rear end and posi track, difference???
« Reply #2 on: December 28, 2015, 05:43:21 PM »
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.
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Offline Duckslayer89

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Re: Locker rear end and posi track, difference???
« Reply #3 on: December 28, 2015, 05:45:00 PM »
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

Offline papisjeep

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Re: Locker rear end and posi track, difference???
« Reply #4 on: December 28, 2015, 05:49:33 PM »
most limited slips uses clutches and sense slippage then lock up
most lockers spin tires equally

Offline jackelope

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Re: Locker rear end and posi track, difference???
« Reply #5 on: December 28, 2015, 05:53:24 PM »
most limited slips uses clutches and sense slippage then lock up
most lockers spin tires equally

 :yeah:

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.
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Online WapitiTalk1

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Re: Locker rear end and posi track, difference???
« Reply #6 on: December 28, 2015, 05:54:55 PM »
most limited slips uses clutches and sense slippage then lock up
most lockers spin tires equally

This  :tup:  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
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Offline jackelope

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Re: Locker rear end and posi track, difference???
« Reply #7 on: December 28, 2015, 05:56:11 PM »
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.
:fire.:

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Offline Shank

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Re: Locker rear end and posi track, difference???
« Reply #8 on: December 28, 2015, 06:24:09 PM »
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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Re: Locker rear end and posi track, difference???
« Reply #9 on: December 28, 2015, 06:31:16 PM »
I Googled it one time and found a good video with explanation of the two.
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Offline Bofire

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Re: Locker rear end and posi track, difference???
« Reply #10 on: December 28, 2015, 07:13:27 PM »
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
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Offline Skillet

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Re: Locker rear end and posi track, difference???
« Reply #11 on: December 28, 2015, 07:52:40 PM »
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. 

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Offline Bofire

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Re: Locker rear end and posi track, difference???
« Reply #12 on: December 28, 2015, 08:07:52 PM »
thanks, I got out my window sticker and it says "automatically locking differential"   ????
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Re: Locker rear end and posi track, difference???
« Reply #13 on: December 28, 2015, 08:22:49 PM »
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.

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Re: Locker rear end and posi track, difference???
« Reply #14 on: December 28, 2015, 08:37:11 PM »
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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