[MrCamo]

The G80 requires roughly a 100RPM difference between sides in order to lock so testing by hand won't work, unfortunately.

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Listen to DieselDrax.
Is that to lock or unlock? I know I’ve don’t that with Lockrite and Detroit’s in the past.

 

[DieselDrax]

Listen to DieselDrax.
Is that to lock or unlock? I know I’ve don’t that with Lockrite and Detroit’s in the past.

That's to lock, the G80 (Eaton mLocker) uses RPM difference to engage up to ~20MPH, Detroit and others use torque input to lock which makes them fast to engage but not friendly on the street. Take a turn and accelerate too hard coming out of it and the Detroit is going to lock and make things interesting. The G80 will never do that, the flip side is that it's not as fast to engage because it does require wheelspin to lock.

 

[DieselDrax]

I'm curious to see if there is a definitive answer to this question.
Anecdotally, my experience is that there is no "locker" in reverse in 2WD.
I always back into my spot at work, it's a tight turn and uphill on pavement. A few times, I have arrived at work after a messy drive-in and still have the truck in 4HI, of course, the rear locker engages within 5 feet of reversing and the truck starts to bind and hop. I stop, switch to 2WD, and reverse in smoothly. If the auto-locker engaged in reverse in 2wd, wouldn't my experience be different?
As I said I am curious to know
Jay

Edit: My truck is Z71 too, also with the Factory tow package and integrated brake controller.
If it is not clear from my description above, I know that the locker engages in reverse in 4WD.

It's definitive, use of 4WD makes no difference. The locker has no idea if you're in 2WD or 4WD, so if you've had it work in reverse in 4WD then it will work in reverse in 2WD.

The binding and hopping is not because of the locker, it's because you're in 4H which causes driveline wind-up/binding when turning on surfaces that provide sufficient traction. If you had no locker you'd experience the same thing, it's the nature of part-time 4WD (4H and 4L), if you have/had 4Auto then it doesn't happen.

This section of video showing how the pawl engages due to inertia from wheelspin also shows why it works the same in reverse. There are 2 pawls, one for each direction (forward and reverse), so you can see how they designed it to work in both directions.

 

[MrCamo]

That's to lock, the G80 (Eaton mLocker) uses RPM difference to engage up to ~20MPH, Detroit and others use torque input to lock which makes them fast to engage but not friendly on the street. Take a turn and accelerate too hard coming out of it and the Detroit is going to lock and make things interesting. The G80 will never do that, the flip side is that it's not as fast to engage because it does require wheelspin to lock.

My Cj5 has the Detroit in the rear, yes it will change lanes on its own if it unlocks sometimes Thanks for clearing up this old school dude

 

[DieselDrax]

My Cj5 has the Detroit in the rear, yes it will change lanes on its own if it unlocks sometimes Thanks for clearing up this old school dude
View attachment 409693

My first old Jeep was a '47 CJ-2a. Had a Ford 302 and C5 auto from a Bronco swapped in, D44 rear with a limited slip and a Powertrax (IIRC) locker up front, 5.38 gears, etc. It was fun. Unrefined, but fun. In this pic I'm coming up the back side of Little Sluice on the Rubicon Trail. Poor quality pic, but it was back in around 2000.

And then some years later my trail toy was a '93 YJ, 4.0, 5-speed manual, D44s, Detroits front and rear, 4.56 gears, 4:1 low-range, rolling on 35s. That would get squirrely driving around town if not careful, but the most annoying part was wishing I had 2LO because those Detroits in soft dirt or sand made it impossible to make sharp turns at low speed. I'd have to shift into 2H to make the turns and then shift back into 4LO. That's where selectable lockers really shine. This was out at the Hammers (Johnson Valley, CA) back around 2008-ish.

Those are the noteworthy/picture-worthy Jeeps I've had, but in total we've have had 8 Jeeps so far. 2 XJs, 2 CJs, YJ, 2006 WK, 2015 JKUR, 2016 WK2.

 

[MrCamo]

Nice- mine has a Matkins Lvl 2 frame. Trussed and thickened Amc20 rear with 4:56 gears. Open Dana 30 up front. Believe it or not with 35” tires this combination had survived EXTREME abuse. Lol. I do however deliver the abuse with a balanced hand (for the most part). I only recently ruined a front axle due to a U-joint failing and blowing up the yolk badly. And I believe that was from a horrible but necessary recovery that also tore a shock off the frame. (Alone on side of mountain at 11pm with one possible winch point and a cliff behind me)

 

[whopist]

I guess I have a white elephant on the forum. I special ordered a Z71 with two wheel drive (not four). It has a G80 limited slip differential. Some do not believe me when I tell them my Z71 is not four wheel drive.

Sorry for not stating that in my original post. Non the less, the question is valid with all the comments. "Much appreciated"

Thanks to all!

 

[hyperv6]

I'm curious to see if there is a definitive answer to this question.
Anecdotally, my experience is that there is no "locker" in reverse in 2WD.
I always back into my spot at work, it's a tight turn and uphill on pavement. A few times, I have arrived at work after a messy drive-in and still have the truck in 4HI, of course, the rear locker engages within 5 feet of reversing and the truck starts to bind and hop. I stop, switch to 2WD, and reverse in smoothly. If the auto-locker engaged in reverse in 2wd, wouldn't my experience be different?
As I said I am curious to know
Jay

Edit: My truck is Z71 too, also with the Factory tow package and integrated brake controller.
If it is not clear from my description above, I know that the locker engages in reverse in 4WD.

Yes it can lock in reverse 2wd or 4wd.

It is not any more complicated than that.

 

[whopist]

We need a need word: locker's---lock and limited slip's---engage.

 

[DieselDrax]

We need a need word: locker's---lock and limited slip's---engage.

Nope. Lockers engage which lock them. Limited slips are always engaged to a certain degree.

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[JayH]

Yes it can lock in reverse 2wd or 4wd.

It is not any more complicated than that.

Well there you go, I learned something new today, and in retrospect, that makes perfect sense.
Whenever I post I will either sound really smart because I know stuff, or I will sound really dumb because I thought I knew stuff!
I just wish it wasn't the second situation so often!!
Jay