Anti–Spin Differential Rear Axle

[19llhpb]

But this is very confusing misprint. The description of both the anti spin and locker are almost the same. i have been trying to spec out a truck and things like this make it very difficult.

so you have the e locker. button activated from cab. true locked rear diff when activated. only good up to 20mph or 40mph in 4WD LOW. Automatically disengages above rated speed and locks back when below rated speed.

Anti-spin. This is a limited slip setup. no user input needed. purely mechanical system built into rear end via clutch discs. works like any limited slip and tries to transfer power to the wheel with traction. plenty of debate up here on effectiveness and what audience it serves.

Are the above correct?

my question. if the window sticker has neither of these then do you have a completely open diff? is there any kind of traction control that uses the brakes to simulate or create an limited slip rear end? i have seen mention of that up here.

hard to believe they still might be selling trucks with true open diffs with all the solutions out there these days. GM has been using the G80 locker forever and while there is debate on it reliability it does work, its automatic, and its a true lock.

All is correct except for e-lock. It does not have to be in 4x4 to work. It works in all modes including 2wd but does stay within speed parameters. Shut traction control off, turn on e- lock in 2wd and launch off the line Not that I have tried this!

 

[19llhpb]

Also if nothing stated on window sticker than it is only an open diff. All traction control does is slows the engine rpm’s until traction is gained at the wheel that is slipping and does provide slight braking to the slipping wheel but does not automatically transfer traction to another wheel. I hate this feature. Good for kids learning to drive or people who don’t know how to control a fish tailing vehicle. Give me a true posi track truck and let me do it MY way

 

[Zeronet]

Also if nothing stated on window sticker than it is only an open diff. All traction control does is slows the engine rpm’s until traction is gained at the wheel that is slipping and does not transfer traction to another wheel. I hate this feature. Good for kids learning to drive or people who don’t know how to control a fish tailing vehicle. Give me a true posi track truck and let me do it MY way

Hmmm, I thought traction control would also apply the brake for the wheel that is slipping?

 

[19llhpb]

Hmmm, I thought traction control would also apply the brake for the wheel that is slipping?

You are right, research states it does apply slight brake pressure to the slipping wheel but just does not seem ‘seat of the pants’ noticeable to me, slipping and slidin in pastures almost every day! I will update my post, thanks again.

 

[Electrical]

Mopar's TCS BLD seems very good to me. Good enough to consider forgoing the Anti-Spin option? Yes... in my humble opinion.

At the same time, locking rear diffs are a HUGE benefit offroad. So huge that any vehicle without it is considered handicapped.

If you get the eLocker, you're covered both on and off road.

If you get AntiSpin, it may or may not be better than the TCS BLD which is already in the truck and you'll be less capable offroad.

 

[MValdez]

You have 3 options:Anti-spin which is limited slip, eLocker which electronically locks the axle when you push the button {works up to 10mph},or an open axle if select nothing.

Wait, Really??? Elocker disengages above 10mph???

 

[James1414d]

Wait, Really??? Elocker disengages above 10mph???

I think its 23 or 25 mph

 

[devildodge]

Wait, Really??? Elocker disengages above 10mph???

Read a little further. It disengages at 27mph and engages when it drops below 20 mph.

I also understand in 4low it stays engaged to 47 mph.

 

[MValdez]

Read a little further. It disengages at 27mph and engages when it drops below 20 mph.

I also understand in 4low it stays engaged to 47 mph.

Thank you for the response... I purchased my Longhorn late october which does not have the Elock and i must say i am bummed. My 2014 f150 had it and it was awesome in the snow.

 

[SpeedyV]

Read a little further. It disengages at 27mph and engages when it drops below 20 mph.

I also understand in 4low it stays engaged to 47 mph.

Yes...and according to Eaton, it disengages once traction is fully restored. I see that as a good thing. You don’t want it staying locked when you pull onto pavement.

 

[19llhpb]

Yes...and according to Eaton, it disengages once traction is fully restored. I see that as a good thing. You don’t want it staying locked when you pull onto pavement.

Not sure about that, when engaged in 2 wd on pavement while turning the inside tire will hop, skip and leave skid marks, it does not shut off till the button is pushed. Just my experiences!

 

[Smashy71]

Not sure about that, when engaged in 2 wd on pavement while turning the inside tire will hop, skip and leave skid marks, it does not shut off till the button is pushed. Just my experiences!

You are correct. I use e-lock until I get onto pavement and there’s always a snow pack where I live. It definitely chirps when pulling onto pavement.

 

[SpeedyV]

Not sure about that, when engaged in 2 wd on pavement while turning the inside tire will hop, skip and leave skid marks, it does not shut off till the button is pushed. Just my experiences!

You are correct. I use e-lock until I get onto pavement and there’s always a snow pack where I live. It definitely chirps when pulling onto pavement.

Thanks, fellas! I hadn't tested this on pavement (for obvious reasons).

FYI - I did find a couple of interesting tidbits in the Eaton FAQ to share:

This question has been asked by other users on this forum:

What locking modes does an ELocker have?
The Eaton ELocker is an open differential with electronically controlled locking features. While the design of the locking components varies between models and generations of designs, they all operate by locking one of the side gears to the differential case. The ELockers operate in either “open” or “fully locked” condition.

The answer to this question may seem obvious, but it is a good reminder of how to safely engage the locking mechanism:

Can the ELocker be engaged “on the fly”?
Yes. You can engage it “on the fly”; however, you must be careful that the wheel speed difference (between the right and left wheel) remains under 50 rpm. We strongly suggest engagement only when the vehicle speed is below 5 mph. While ELockers are designed to accommodate harsh use, continuous abuse and extreme speed engagement will greatly decrease the life of the ELockers. The driver needs to keep in mind that when the electrical signal is received by the ELocker, it immediately tries to lock and match wheel speeds. The differential must immediately snap (accelerate) the slow speed wheel, axle shaft, and brake component mass (weight) to the same speed as the free-spinning wheel. This is not only harsh on the differential; it is extremely harsh on the axle shaft.

 

[19llhpb]

The ways of safely engaging the axle lock are basically the same as engaging the diff lock on a semi tractor. Obviously I do not intend to turn it on while on pavement but did accidentally a couple times and knew right away! It does work well

 

[PTRAM]

I have just had my Ram for about 4 weeks now and when I purchased it on lot, I checked everything out I thought. I have always purchased 3:92 limited slip previously. I just noticed the 3:92 and saw the Electric locker and didn't really check that it didn't have limited slip until after purchase. Transfer case is (DH8S)--electric shift on demand.
Transmission is (DFR)--8 speed auto 8HP75. And E-Locker Rear Axle (DSH)

We had a really heavy rain last week while I was driving about 15 miles in it. At stop lights and nobody in front of me I took off pretty fast and no slipping at all. I always drive it with the "auto 4 wheel drive" position always on. Then a few days later I took off from a stop light with the pedal down as usual and a little slippage on the rear tires. I had just had my dealer balance all 4 tires. So, when I got home I noticed they had moved it to 2 wheel drive so I corrected that and probably won't have any slippage on wet roads. I did read about the E-Locker and I probably won't have any need to use it.

 

[Gman]

4WD Auto will reduce your MPG, so just be aware.

 

[Electrical]

All great answers but still a mystery why the list it as electronic actuator vs just saying limited slip.

It's just a misprint. No mystery

Anti spin is just clutches and gears. ... Nothing electronic.
...

How are we dismissing this as a misprint and nothing electronic? Sources please.

The electronic actuator may in fact mean the Antispin is electronically controlled as described in these links.

If it is eLSD, I might believe that elevates this above BLD in the traction control.

https://www.caranddriver.com/news/a...ch-type-of-automotive-differential-explained/

https://auto.howstuffworks.com/elsd2.htm

 

[Electrical]

The Jeep Wranglers also have the option for Antispin axles. It seems this use to be called Trac-Loc on the Jeeps (?). How similar or different is it from the Ram? Dunno, but lots of good reading out there.

If you jump to 2:55 in this video, there's a few comments about how BLD interacts with the Antispin. They are described as being complimentary. Antispin has some sort of torque transfer limit, beyond which BLD steps in. Antispin appears to be rear axle only; therefore the front axle relies entirely on BLD to limit slip.

Although I still believe eLocker can't be beat when offroad, I'm really impressed with what I'm seeing for Antispin. A user in one of the threads I found said the Antispin electronic control can limit wheel spin to within a half tire rotation. Judging by how fast BLD works, I'm inclined to believe.

 

[Neurobit]

How are we dismissing this as a misprint and nothing electronic? Sources please.

The electronic actuator may in fact mean the Antispin is electronically controlled as described in these links.

If it is eLSD, I might believe that elevates this above BLD in the traction control.

https://www.caranddriver.com/news/a...ch-type-of-automotive-differential-explained/

https://auto.howstuffworks.com/elsd2.htm

Source (service manual):

 

[Electrical]

I don't see anything there that allows inference about electronic control.

I would argue (in a legal sense) that the wording in the description is similar because the function is similar.

The eLocker uses an electronic actuator to lock. The Antispin uses an electronic actuator to engage the clutches?