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Old 02-05-2013, 07:20 PM   #99
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Not at all true. GM trucks have had lockers as an option since at least 1988. Memory fades...but it was somewhere around there. If you're interested, there are some pretty good youtubes on the G80 Eaton locker that GM uses. Watch them and you will see that they are more than street worthy. They are standard in ALL Police versions of the Tahoe.
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Old 02-06-2013, 12:59 AM   #100
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That is either a switchable locker or a Limited slip
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Old 02-06-2013, 01:44 AM   #101
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Locker/Limited slip

A true "Locker" does not run normally open and then distribute torque bias to either wheel/axle when needed.It is 100% torque to both wheels/axles 100% of the time.What you are describing is a "Limited Slip" that does not lock both wheels/axles 100% of the time.
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Old 02-06-2013, 09:22 AM   #102
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Quote:
Originally Posted by Sylver Slypr View Post
That is either a switchable locker or a Limited slip
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Originally Posted by Sylver Slypr View Post
A true "Locker" does not run normally open and then distribute torque bias to either wheel/axle when needed.It is 100% torque to both wheels/axles 100% of the time.What you are describing is a "Limited Slip" that does not lock both wheels/axles 100% of the time.
Sorry, no, that is not right.

The GM axle is a locker.

A true locker does run normally open. The one GM uses is automatic, when one wheel slips the rear locks both sides together.

For the aftermarket serious off-road use lockers they ARE normally open with a switch (air or electric) to lock the rear.
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Old 02-06-2013, 09:46 AM   #103
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How and when a locker is applied is not the definition of a locker. A limited slip is just that - limited. It has a constant clutch pack slip threshold. When enough torque is applied to reach that threshold, the clutch slips.....always at the same apply torque and slip threshold.

The G80 (and others) have a variable clutch apply pressure and slip threshold. The variation is created by the cams in the apply plates which increase the clutch plate pressure in direct relation to the amount of torque applied. Bottom line is, there is NO clutch slippage (thus locked) until a calculated point where axle shaft breakage is possible.

I think I know what Sylver Slyper is trying to say....there are some brands and models of lockers that are for off road only. They are very robust and designed for extrordinary loads and performance and very heavy shock loads. These are not suitable for on road use and no manufacturer uses them for that reason. That does NOT mean that the on road variations of a locker are not "true lockers". That phrase is thrown around a lot and means many different things.

Bottom line...the lockers designed for on road use ARE LOCKING DIFFERENTIALS, are very different than limited slip and are much better than a limited slip for truck applications in general. Exception: performance street trucks, like the old Silverado SS
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Old 02-06-2013, 10:08 AM   #104
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Towing still kind of boils down to drive axle tire traction. For all purposes (anti-sway), not just to move back or forth.

Traction aids plus tire type and design should work well together. 4WD can be no more than a band-aid if not "done" correctly. And correctly means compromises of on-road dry and wet traction.

The details of limited slip and lockers is central to how well drive axle traction can be maintained for a given rig in defined circumstances, 2WD or 4WD.

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Old 02-06-2013, 11:31 AM   #105
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I'm pondering a new truck to replace my 4WD Expedition at some point, and I see the Ford 150 has an option for a 3.73 electronic locking rear axle. So with 2WD and this option, would it seem to be a sensible towing compromise without going to 4WD? I'm seeking to balance towing with need to use the truck as a daily driver. (Also would avoid towing in snow and on muddy dirt roads).
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Old 02-06-2013, 11:56 AM   #106
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I'm pondering a new truck to replace my 4WD Expedition at some point, and I see the Ford 150 has an option for a 3.73 electronic locking rear axle. So with 2WD and this option, would it seem to be a sensible towing compromise without going to 4WD? I'm seeking to balance towing with need to use the truck as a daily driver. (Also would avoid towing in snow and on muddy dirt roads).
I had heard Ford had moved away from limited slip and to a locker. I don't know who or what they are using. Is is a mechanical locker?

To answer your question...IMHO....I would take a mechanical locker 2wd over a 4wd OPEN diff, any day....for our normal trailer towing situations. The only thing that takes me to 4wd for towing is when you are maneuvering and jockying around a site, usually backing, up hill and tight. It's nice to take the strain off the drivetrain and drop the transfer case into the low set. You have much greater control of the throttle as well.

I have had, as personal vehicles 3 lockers. One was AWD, the other two were 2wd. I have pulled my old SOB out of sandy Michigan beach sites with 2wd locker easily, while I saw 4wd open diffs get stuck. In addition, I have driven literally dozens of company trucks with the locker in AWDs, 4WDs, and 2WDs in every kind of terrain and road conditions, solo and towing.

Edit: Snowy travel excluded in my statements above. AWD is best in snow, followed by 4wd, followed by 2wd locker, followed by 2wd open....assuming traction control on all.
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Old 02-06-2013, 11:59 AM   #107
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I'm pondering a new truck to replace my 4WD Expedition at some point, and I see the Ford 150 has an option for a 3.73 electronic locking rear axle. So with 2WD and this option, would it seem to be a sensible towing compromise without going to 4WD? I'm seeking to balance towing with need to use the truck as a daily driver. (Also would avoid towing in snow and on muddy dirt roads).
I think (from tinkering with the configurator) that the 3.73 LSD is preferable to the electronic locker, because that's the diff for the "HD Payload" option. When I configure an F150 Ecoboost Supercrew with that diff the configurator throws in HD Payload.
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Old 02-06-2013, 12:13 PM   #108
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I'm pondering a new truck to replace my 4WD Expedition at some point, and I see the Ford 150 has an option for a 3.73 electronic locking rear axle. So with 2WD and this option, would it seem to be a sensible towing compromise without going to 4WD? I'm seeking to balance towing with need to use the truck as a daily driver. (Also would avoid towing in snow and on muddy dirt roads).
In doing a search, I believe Ford is using the Eaton eLocker. A magnetically engaged, electronically applied MECHANICAL locker. That is a good alternative to 4wd in most trailering situations.
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Old 02-06-2013, 01:08 PM   #109
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Here is a great example of limited slip, positrac, etc.

Pap

Eaton Locking Differential Demonstration - YouTube
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Old 02-06-2013, 03:59 PM   #110
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Great video! Thanks for posting. It really clears up the difference between locking axle and limited slip.
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Old 02-06-2013, 04:21 PM   #111
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I used a 2011 Infinity QX56 with 2WD for about 6 months with my A/S. I traded it in on a 2012 Infinity QX56 with 4WD. I think that tells you about the utility of the 4WD.
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Old 02-06-2013, 09:36 PM   #112
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Open/Locker

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Great video! Thanks for posting. It really clears up the difference between locking axle and limited slip.
This "Locker" is a Limited slip torque bias differential Being compared with an open (non limited slip) stock rear
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