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The factory anti spin diff is crap

Rockcrawlindude

Rockcrawlindude

a rock crawlin’ dude
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I’ve had many trucks with limited slips. Toyota with real (clutch pack) Lsd, Ford/sterling real (clutch pack) lsd, GM G80 / Eaton locking in 10 bolts and in a Dana M220

I’ve also ran aftermarket differentials; ARB, Detroit, spool, Spartan, Eaton, grizzly, lock rite to name a few.

I don’t think I’ve had a helical limited slip before.

This 2019 Ram trucks “anti spin” is the worst I’ve ever experienced. I’ve turfed my yard with a one wheel peel with one tire in the grass and one on the driveway. I just had one tire on asphalt and one in the mud and lots of wheel spin. I’ve not experienced another LSD that allows so much wheel spin on the low traction wheel. It acts more like an open diff when the two tires have very different grip levels.

I only have issues with this truck when one tire is on pavement and one tire has no traction.

If both are in loose/soft both will spin… if both are on pavement both will spin.

What kind of anti-spin do these trucks have? Is it helical? Is this the way it is designed to work or is it just a bad one?
 
Yup I've experienced similar things in my PW. Its a helical design in the PW and I believe the regular anti-spin is the exact same design minus the locker. If you have one wheel with traction and the other doesn't it acts very much like an open diff which is frustrating. However if they both are on slick surfaces it just grips and goes.
 
I had a clutch type limited slip in my 98 Chevy 1500 that I actually liked way better than the one in the Power Wagon. Was much more predictable.
 
Gear box said:
In class 8 trucks you can sometimes have luck with a slight brake application to put the torque where you need it.
That may be worth experimenting.
Click to expand...

This was in my 04.5 owner's manual and even though AFAIK the same LSD isn't used, I've always applied this method when at a standstill and had any tire spin. Sometimes just applying the e-brake a few notches works wonders since all these DBW vehicles tend to cut power if you 2-foot it..
 
Gear box said:
In class 8 trucks you can sometimes have luck with a slight brake application to put the torque where you need it.
That may be worth experimenting.
Click to expand...
Brutal_HO said:
This was in my 04.5 owner's manual and even though AFAIK the same LSD isn't used, I've always applied this method when at a standstill and had any tire spin. Sometimes just applying the e-brake a few notches works wonders since all these DBW vehicles tend to cut power if you 2-foot it..
Click to expand...
I wouldn’t be against doing that when in my yard. For example I wasn’t bent out of shape the first time it happened and I was backing up my yard/driveway and one tire broke loose and turfed the yard. Backing up a hill it’s pretty common to slip a tire. Once the tire dug up the grass, I just moved the shift lever to 4 wheel and that was fixed.

But, today, I didn’t have time to play with the parking brake, or 4wd. I needed my LSD to do its job. I needed to pull out onto the highway with one tire on the pavement and one in the mud. I spun and spun the right tire and missed my opportunity and had to get out of the fuel. I’m sure the ford behind me got a good chuckle because I know for a fact the sterling 9.75 LSD works better than that.
 
My understanding is that the RAM HD uses a geared limited slip, not a true Torsen but similar in design. An actual Torsen requires paying the company for the limited slip but allows marketing of the name (such as the front diff of a Ford Raptor). The clutch-type limited slips work OK but eventually the clutch material wears out. The torque-transfer ability is also very low to allow for normal cornering and handling feel. The GM Eaton G80 works well, but they are not durable. 3500 RAM trucks come standard with the limited slip feature; on 2500's it is an option. I'm under the impression the Power Wagon does not have a limited slip at all since it has lockers and it would seemingly be difficult to have both features.
 
Nope, Power Wagon has both. It's actually fairly easy to do. All the E locker does is slide in a pin or splined cone to lock the 2 axle shafts together.
The gear limited slip works for daily driving.
 
troverman said:
My understanding is that the RAM HD uses a geared limited slip, not a true Torsen but similar in design. An actual Torsen requires paying the company for the limited slip but allows marketing of the name (such as the front diff of a Ford Raptor). The clutch-type limited slips work OK but eventually the clutch material wears out. The torque-transfer ability is also very low to allow for normal cornering and handling feel. The GM Eaton G80 works well, but they are not durable. 3500 RAM trucks come standard with the limited slip feature; on 2500's it is an option. I'm under the impression the Power Wagon does not have a limited slip at all since it has lockers and it would seemingly be difficult to have both features.
Click to expand...

I am not sure but kind of sure that my 19 PW has a lsd of some kind, there has been plenty of times when I felt it do it's thing. I wish it were an open diff...ideal is an open/selectable locker imo.
 
Crusty old shellback said:
Nope, Power Wagon has both. It's actually fairly easy to do. All the E locker does is slide in a pin or splined cone to lock the 2 axle shafts together.
The gear limited slip works for daily driving.
Click to expand...

I'd love to see some info on that. My service manual discusses the lockers regarding the PW, but nothing about the limited slip. It's not so easy as to slide a pin across with a solenoid or electromagnet when you have a torsen-style limited slip gearset in the way.
 
Someone posted a picture of it in another thread.
And I can tell you from personal experience, it has it. I've exercised it more than a few times. :cool:
 
Just looked back at the Op's post and forgot that he has a Tradesman with the PW option. So he doesn't have the gear LSD, but the clutch LSD I do believe. If memory serves me, only the actual PW came with the gear LSD and lockers. The Tradesman with the PW option got the clutch LSD.

Someone correct me if I'm wrong here.
 
Wow, lots of good info on this thread. Like @H3LZSN1P3R mentioned, my diesel 2500s limited slip works really well.

@Rockcrawlerdude I had a similar situation to you where I had 1 tire on pavement an one in mud. I wasn't getting on a freeway but gently rolled on the throttle. The off pavement tire spun less than 1 revolution before I had a firm engagement of the LSD, which let me get onto the road. My wife also parked my truck in the "swampy" part of the yard. He left 2 solid skid tracks and she pulled back onto the street.

My question now is "what kind of LSD is on a 2020 diesel 2500"? Is it different than a 2019 or a 6.4 powered truck?
 
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