1500 Anti Spin Rear

[GRN69CHV]

Is this a locker or clutch pack type? Recently had my truck on stands with tires still on, each wheel spun easily like it was an open differential, too easily. I bought the truck used in '18, window sticker lists Anti Spin rear in optional equipment. If this is a clutch pack differential, then the clutch packs are toast. Truck did come with 100K powertrain warranty including engine, trans and front/rear differentials.

 

[crash68]

The Anti-spin is a clutch type differential, but it's my understanding that it has little to no no pre-load of typical clutch type LSD.

 

[GRN69CHV]

The Anti-spin is a clutch type differential, but it's my understanding that it has little to no no pre-load of typical clutch type LSD.

Interesting. That's how this acts.

 

[John Jensen]

Crash is correct.
The clutch pack is electronically operated depending on the demand.
A member * on this forum has a mod that locks the clutch pack via a switch. I have it and it works great.

* https://www.ramforum.com/threads/transfercase-diagram.55161/page-11

 

[crazykid1994]

Crash is correct.
The clutch pack is electronically operated depending on the demand.
A member * on this forum has a mod that locks the clutch pack via a switch. I have it and it works great.

* https://www.ramforum.com/threads/transfercase-diagram.55161/page-11

Sorry John. That’s the transfer case. OP is asking about the rear differential. Which is not electronically controlled.

 

[John Jensen]

Damn - another 86 year old FU. Thanks for correcting me. It's a bit embarrassing to be so stupid

 

[Ricks Ram]

As stated the factory LSD has pretty much no preload. When the tires are off the ground it acts like a regular open differential.

Sent from my SM-G960U using Tapatalk

 

[Travelin Ram]

Some designs- I’m no expert on this one in particular- use torque applied by the pinion to increase pressure on the clutch pack.
So when you coast around a corner the clutches are released and under acceleration they are clamped.

My quick and dirty method to test LSD has always been one tire on the pavement, and the other on grass /dirt. Stomp on it and a good LSD will spin the tire on pavement. A worn out LSD or an open diff will give you the one wheel peel on dirt.

 

[kurek]

The anti-spin has no preload because these vehicles all have traction control which is assumed (by the manufacturer) to always be enabled.

A clutched LSD relies on the existence of some torque to ramp up the pressure on the clutches. If you had no preload and lift a tire off the ground there will be no torque present, so the LSD would not become active. Clutch preload provides some drag, presumably enough to get the kingpin to ramp up and load the clutches enough to get you moving.

In our trucks traction control provides the torque so preload inside the LSD is no longer necessary. With no preload the clutches and lube last longer because they're not working against each other any time you go around any kind of curve in the road or if one of your tires is fractionally smaller or inflated differently from the other.

 

[GRN69CHV]

The anti-spin has no preload because these vehicles all have traction control which is assumed (by the manufacturer) to always be enabled.

A clutched LSD relies on the existence of some torque to ramp up the pressure on the clutches. If you had no preload and lift a tire off the ground there will be no torque present, so the LSD would not become active. Clutch preload provides some drag, presumably enough to get the kingpin to ramp up and load the clutches enough to get you moving.

In our trucks traction control provides the torque so preload inside the LSD is no longer necessary. With no preload the clutches and lube last longer because they're not working against each other any time you go around any kind of curve in the road or if one of your tires is fractionally smaller or inflated differently from the other.

Thanks for the clarification. I'm not familiar with these, my experience with clutch style has been old muscle car Eaton style and Ford clutch setups.

 

[bm02tj]

The new LSD are the most useless thing going
By the time the traction control loads the clutches you dug a hole and are stuck
The older style with preload is by far better

 

[kurek]

I keep not having problems with mine.