Engine/Transmission (1998.5 - 2002) LSD not working?

[RGardner]

I have a lsd in my 2001 1ton that seems to have quit working. The past several days have been icy and snow packed here and I have noticed that when one rear wheel slips the other does not take hold. I don't understand what is going on? Any infor would be greatly appreciated.

 

[CumminsFarmer]

My father-in-law has an 01 dually and like all duallys its a real nightmare on snow and ice. He has a LSD, as does my '02 2500 SRW. Im not sure if this is your problem, but around here dually's have problems with traction and braking on ice, LSD or not. More tires to try and stop and get going on extremely slick surfaces.

 

[RGardner]

I can sit and spin with one rear wheel while the other does nothing, it sure seems like it didn't used to be that way.

 

[ACoyle]

I forget do you have a Dana or AA? If you have a Dana, the LSD is provided with clutches, which can either be worn or need to be adjusted.



I seem to remember that you have to block the wheels, elevate one wheel and use a torque wrench to spin the wheel and measure the torque needed to break the clutch free.

 

[ed9824v]

ON MY 98. 5 when i put it in neutral and jack up one rear wheel I can barely turn the other tire and wheel. On my boys 70 chevy it has a gov lock and you can spin it free it only engages at a certain Rpm bad set up went to an Eaton clutch set up. but the dodge is tight at rest might want to try that simple test, if it slips may the limited slip additives might help usually for chattering sound in rear. good luck. Ed

 

[Ramtuf1]

2001 dually in snow..

I can relate to traction issues with a dually in the snow. Upstate New York can present real nightmares with a poorly handling truck. The first few years I owned the truck I avoided taking it out because I could never figure out what it was going to do next in snow and with the poorer quality steering, It always felt that I was going to put it in the ditch.



My LSD rear end also would spin when in poor traction conditions especially when trying to help someone out of a ditch. One thing is that the LSD is not the same as posi-traction of yesteryear. It didn't take much to break loose one of the rear duals.



I have since found that removing the inside rear wheel on each side and bringing the tire pressure up to match the front has helped greatly. I also put about 15 (60 Lb) tubes of sand directly over the rear axle. With that and 4 wheel drive, I have no problems using the truck in the winter now. Steering has not been upgraded yet but truck is more predictable than before.



Rear LSD seems more effective now with more pressure per square inch on tire contact area of rear tires (2). Enjoy winter much more as far as winters go.

 

[Troubleshooter]

Mine is also an '01 SRW that the previous owner had ordered with the LSD. I figured that would be OK based on the good results I had with the viscous-drive LSD in my car.



Boy was I wrong! #@$%! This thing has never worked well, and I plan to replace it at the next opportunity with an air-locker.



Love the Cummins, but in my humble opinion, the LSD is a POS.

 

[DCreed]

factory LSD set up was loose to tighten it needs to be set up with more clutches and plates in contact. They can be made too tight and cause non slip, like a spool. additives ADD slip to lessen chatter.

 

[John - K5AWO]

I used to have a '95 Plymouth Satellite that I bought with a positrac diff. Lived in Oklahoma then and when the black ice hit the pavement, getting it to turn was an exercise in tight butt muscles. The locked rear diff wanted to push straight ahead.

My dually has the LSD which works great when I haul the trash trailer to the dump. Lots of freshly dozed dirt out there. Haven't had it on ice or snow yet. We don't see too much of that stuff here in Phoenix

When I do get it in slippery stuff, I lock up the front axle even in the dirt at the trash dump. I've seen too many people changing tires at the dump because they let a tire spin and sliced it on junk metal and broken glass.

 

[bnbrown]

Might be time to replace the clutches in the LSD...

In my '99 I have pulled our 24' stock trailer up hill with only one wheel getting traction, works even better than I expected. On our 2000 if you get one wheel on ice or even snow you are pretty much done, still has a little grab left but barely, one wheel will turn probably 10 to 1 on snow (with Dual chains) seems that the passenger side spins much more than drivers side. Spend a great deal of time on icy/snow covered roads. I would have to agree the duals dont help in the snow/ice, although I am sure the bald tires dont help either.

 

[rkressg]

OK,
So what does it take to replace the clutches on an LSD
Mine is doing the exact same thing. I have about 150k on the truck.
-Rich

 

[Alphacowboy]

For all you LSD questions and needs... .



Click the below link!



https://www.turbodieselregister.com/forums/truck-911-archive-members-only/139634-d80-issue.html

 

[DCreed]

Thanks Alpha

 

[rkressg]

This might be a dumb question, but where would is the best place to buy a clutch setup for the rear and what should I expect to pay?

 

[CFast]

It's not the LSD's fault, it's the people that build it. The clutches and plates should be staggerd, they're not. My '01 had all the clutches together and all the plates together. It didn't work. I pulled it apart one day in the drive way. It's REALLY easy. If you have basic hand tools and a torque wrench. Pull the diff cover, drain the oil. Go to the tires, unbolt the axle flanges, pull the axles out about 1 foot, just until you feel them come out of the diff. Go back to the diff, mark the caps, left and right. Remove the caps, mark the bearing cups left and right. Pull the diff, hopefully it comes right out, mine did. If not you might have to pry it. Get the diff on a bench. Take it apart. You should just have to restack it, it shouldn't be worn, it hasn't ever worked! Put it back in the diff, caps on and torqued, axles in. Put the cover back on. Fill with oil. Get some LS oil add small amounts and drive it around. The more you add the more it slips. I put one bottle in mine and it's tighter than a bulls butt. I did this almost 4 years ago in about 3 hours. It works great in sand, mud, snow, rain( the truck will get sideways on the freeway in the rain when I floor it. ) Hell it even works great rock crawling. It's not a bad design, just needs to be stacked right.