Limited slip
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Elder User
Joined: May 2003
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From: NW Montana
Limited slip
Yesterday I went to leave my driveway and the right rear wheel ended up on a patch of ice, I put it in drive and gassed it and went no where. I goosed it again and still no movement. I pointed my mirror down at the left tire and wrapped it up to about 17k and it never moved and neither did the truck. So I had to go into 4wd because ONE tire was on ice. Didn't know I bought a one legger. Window sticker shows L/S installed.
Called the dealer and spoke with the svc writer and was told to bring it in. Got it back today, was told everything works fine. I was handed a sheet from ford that said to lightly apply the parking brake while accelerating to make the L/S work... WHAT?! So does this mean that I have to drive with my brakes on while in slippery conditions for the L/S to work?
This is the first I have ever heard of this.... Anyone have words of wisdom, or at least logic?
Called the dealer and spoke with the svc writer and was told to bring it in. Got it back today, was told everything works fine. I was handed a sheet from ford that said to lightly apply the parking brake while accelerating to make the L/S work... WHAT?! So does this mean that I have to drive with my brakes on while in slippery conditions for the L/S to work?
This is the first I have ever heard of this.... Anyone have words of wisdom, or at least logic?
More Turbo
Joined: Feb 2004
Posts: 722
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From: New Orleans to San Diego
It makes me feel retarded but i still can't explain how a limited slip rear end works.
I should though.
I had L-S in my 5.4 1999 F-150 but i didn't opt for it my 04 6.0 F-250.
Shouldn't T_J82 's truck put power to his slipping(spinning) wheel and propel him forward?
Why would it do that?
What would my 4x2 non L-S truck do in the same situation?
I should though.
I had L-S in my 5.4 1999 F-150 but i didn't opt for it my 04 6.0 F-250.
Shouldn't T_J82 's truck put power to his slipping(spinning) wheel and propel him forward?
Why would it do that?
What would my 4x2 non L-S truck do in the same situation?
Posting Guru
Joined: May 2004
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From: Northern Utah
If there is one thing that I don't think is up to par on my truck, it is the LS. Sometimes it works and other times it performs exactly as t_j outlined. One Wheel Wonder... Sorry folks, have to call a spade>A Spade!
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Joined: Jan 2005
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Several different kinds of L/S differentials are available. Most use clutch packs in various devices to limit slip but allow some to prevent excess tire wear during turns. These are usually simple and sturdy devices but they do allow different wheel speeds to continue until traction is again equal. T_J82's L/S is clearly busted though. The whole point of putting the clutches and springs etc in the diff. housing is to prevent the wheel speeds from getting that far apart.
The dealer here is full of it. I sure don't have to use the brakes to get my hot rod to lay down two black stripes!
Unfortunately this is an area where brand C provides a better product. They use a more advanced Eaton posi that once wheel spin causes it to engage actually locks the two axles together until traction is equalized again. This is good for spots like boat ramps where even if a regular L/S is working, one tire can be spinning a little faster than the other so you really only have one wheel putting power down.
The dealer here is full of it. I sure don't have to use the brakes to get my hot rod to lay down two black stripes!
Unfortunately this is an area where brand C provides a better product. They use a more advanced Eaton posi that once wheel spin causes it to engage actually locks the two axles together until traction is equalized again. This is good for spots like boat ramps where even if a regular L/S is working, one tire can be spinning a little faster than the other so you really only have one wheel putting power down.
Posting Guru
Joined: May 2004
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From: Northern Utah
Originally Posted by ford390gashog
a ls is different than a locker
Not to vent but this is a real issue
Remember: I said earlier it was the one issue- Other than the LS it really is a great truck
Last edited by utahtom; Feb 9, 2005 at 07:48 PM.
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Joined: Jan 2005
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Originally Posted by utahtom
I agree but it is the new millenium and the Ford PSD is a fantastic truck with somewhat of an achilles heel- .....
Not to vent but this is a real issue
Not to vent but this is a real issue
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Posting Guru
Joined: Jan 2004
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the only thing you can do is get rid of the ford L/S and buy a good after market limited slip,or put up with the ford,or do as they say with the parking brake. It is funny that in some things the ford is so much better then brand c & D AND OTHER SUCH AS THE L/S THEY ARE BEHIND.GOOD LUCK
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Senior User
Joined: Mar 2004
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From: fresno, oh
Where would you get an aftermarket limited slip for them at...my truck jumps and shakes when the backtires spin...i can never spin both back tires without that whole truck shaking...it is pretty annoying and i have only ever seen one tire spin...kinda makes me mad b/c it sucks that i have to engage 4x4 to get places that honda's can go
Senior User
Joined: Apr 2004
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From: Florida
What seems strange to me is that the LS will work one minute and not the next. For instance, I got stuck on wet grass and only the right rear spun and truck wouldn't move. Another time with a few inches of snow my wife had the right rear spinning trying to get out of the driveway and needed 4 high. Yet tonight after installing the HP tune from the SCMT 1704 I couldn't seem to keep the rear of the truck in a straight line! 
It'll spin both tires very easily. Anyhow My truck is going to the dealer Monday for a handful of things including this LS problem. The shop foreman/master diesel tech (who has worked on many of my trucks) said he would add a clutch pack/shim or two if I wanted it tighter. I'll report back the end of next week when I get the truck back.
It'll spin both tires very easily. Anyhow My truck is going to the dealer Monday for a handful of things including this LS problem. The shop foreman/master diesel tech (who has worked on many of my trucks) said he would add a clutch pack/shim or two if I wanted it tighter. I'll report back the end of next week when I get the truck back.
Postmaster
Joined: Aug 2003
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From: Central Texas
Originally Posted by 04 LARIAT STROKER
Where would you get an aftermarket limited slip for them at...my truck jumps and shakes when the backtires spin...i can never spin both back tires without that whole truck shaking...it is pretty annoying and i have only ever seen one tire spin...kinda makes me mad b/c it sucks that i have to engage 4x4 to get places that honda's can go
Junior User
Joined: Dec 2003
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My dealer checked my LS and said it was within FMC spec. of 20 lbs. of breakaway torq. Whatever that means.They said they could tighten it up but the rear end would possibly chatter when going around a corner. I would stop complaining about this if they would refund me the sticker amount for the LS option. Wife has a Durango and that LS works flawless. Ford needs to work on a satisfactory solution to correct this.
Senior User
Joined: May 2004
Posts: 291
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From: Rocky Mountains
I don't know if this applies, but pushing 20# of torque using a torque wrench is a 2 finger maneuver - which doesn't seem like much help in moving a 7K# truck. Is this flawed logic/guessing and doesn't apply here?
Lead Driver
Joined: Sep 2003
Posts: 5,241
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From: Other side of the sunrise
I believe that if you had enough weight in the rear end, the torque differential would tighten up and the LS would work. I'm not sure about this but when I asked my dealer's Shop Foreman, he gave me a reply something like that. Point is that the truck is made to tow/haul. I suppose the diffential is designed to work most efficiently under those conditions.
Try it with weight in the back, like sand bags or a couple of wet bales of straw. Then try and light the wheels up to see if they both spin. I think I'll try that too to see if the Shop Foreman was full of SSSSSSSt. At least you could expect better traction with the weight in the rear, even if both tires didn't spin.
Try it with weight in the back, like sand bags or a couple of wet bales of straw. Then try and light the wheels up to see if they both spin. I think I'll try that too to see if the Shop Foreman was full of SSSSSSSt. At least you could expect better traction with the weight in the rear, even if both tires didn't spin.
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From: NW Montana
Originally Posted by olfordsnstone
I believe that if you had enough weight in the rear end, the torque differential would tighten up and the LS would work. I'm not sure about this but when I asked my dealer's Shop Foreman, he gave me a reply something like that. Point is that the truck is made to tow/haul. I suppose the diffential is designed to work most efficiently under those conditions.
Try it with weight in the back, like sand bags or a couple of wet bales of straw. Then try and light the wheels up to see if they both spin. I think I'll try that too to see if the Shop Foreman was full of SSSSSSSt. At least you could expect better traction with the weight in the rear, even if both tires didn't spin.
Try it with weight in the back, like sand bags or a couple of wet bales of straw. Then try and light the wheels up to see if they both spin. I think I'll try that too to see if the Shop Foreman was full of SSSSSSSt. At least you could expect better traction with the weight in the rear, even if both tires didn't spin.