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1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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Old 07-17-2006, 03:37 PM   #1 (permalink)
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Limited Slip Differential

I'm suppose to have the 3.73 Limited Slip Differential in my truck. My understanding of a limited slip is that I shouldn't be able to sit and spin just one of the rear wheels on a slippery surface. It should act just like a true posi rear end. I've also heard that if you jack up one tire, you shouldn't be able to spin it freely by hand either. I tried this with the tranny in neutral and only one tire and the drive shaft spin at a time. The rear wheels are not locking together like I think they're suppose to. If I brake stand the truck, only one tired spins. I first noticed the problem on went grass in 4 low trying to pull another truck. Only one rear tire would spin and one front. I know only one in the front spinning is normal but both my rears tires should be spinning.

I think my limited slip is not working. Am I correct?
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Old 07-17-2006, 04:04 PM   #2 (permalink)
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Re: Limited Slip Differential

Others will chime in on this, but it sounds like a stock Ford limited slip. They are relatively useless.
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Old 07-17-2006, 05:18 PM   #3 (permalink)
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Re: Limited Slip Differential

You are correct, sir. My '02's LS rear was much better. This one just plain sucks. I like this truck in all other regards.
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Old 07-17-2006, 08:00 PM   #4 (permalink)
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Re: Limited Slip Differential

Just apply the break a little to load up the clutches and it will work. Sound weird and definatly not a good design but it will work. On a side note my LS rear works well in loose sand. I think maybe they need some use now and then.
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Old 07-17-2006, 08:01 PM   #5 (permalink)
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Re: Limited Slip Differential

Check your Diff code on the doorpost. If you have the limited slip it should read " C3". If not, you have the open differential. For what it is worth, i had to order mine limited slip.
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Old 07-17-2006, 11:21 PM   #6 (permalink)
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Re: Limited Slip Differential

[ QUOTE ]
I tried this with the tranny in neutral and only one tire and the drive shaft spin at a time.

[/ QUOTE ] You don't have a L/S
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Old 07-18-2006, 12:38 AM   #7 (permalink)
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Re: Limited Slip Differential

For the record, a "posi" rear end is the same thing as a "limited slip".

Contrary to some peoples experiances, my factory LS has been working fine and has gotten me over some pretty rough terrain. I am aware though, that it isn't a full locker like I have in my Bronco and don't expect it to function the same.
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Old 07-18-2006, 07:14 AM   #8 (permalink)
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Re: Limited Slip Differential

[ QUOTE ]
Check your Diff code on the doorpost. If you have the limited slip it should read " C3".

[/ QUOTE ]

Nah, he has a 2005. Per the workshop manual, for 2005 the axle codes for PSD pickups were:

37 3.73 non-limited slip - F-250
41 3.73 non-limited slip - F-350 SRW
3L 3.73 limited slip - SRW
4N 4.10 limited slip - DRW
4L 4.30 limited slip - DRW

For 2004 and older PSDs, a code C3 rear end was:
C3 4.30 limited slip, F-250/Excursion w/V-10 gasoline engine [img]/ubbthreads/images/graemlins/shocked.gif[/img]



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Old 07-18-2006, 07:46 AM   #9 (permalink)
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Re: Limited Slip Differential

I think it should read

41 4.10 non-limited slip

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Old 07-18-2006, 08:06 AM   #10 (permalink)
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Re: Limited Slip Differential

[ QUOTE ]
I think it should read

41 4.10 non-limited slip


[/ QUOTE ]

4.10 non-limited slip is not available on a PSD pickup. You can get it on a gasser, but it's code 32.

Perhaps you're confusing the code on the axle tag? On the axle tag, if the first two digits of the second line begin with 4_1, then that's a 4.10 non-limited slip. But the axle code on the vehicle certification sticker will then be 32.
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Old 07-18-2006, 08:54 AM   #11 (permalink)
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Re: Limited Slip Differential

Got it [img]/ubbthreads/images/graemlins/smile.gif[/img]

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Old 07-18-2006, 10:19 AM   #12 (permalink)
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Re: Limited Slip Differential

Well the code on the door is 3L so maybe they forgot to install the right hardware [img]/ubbthreads/images/graemlins/smile.gif[/img] Anyways, it's at the dealer today so we'll see what they say. I talked to a tech there last week about it and he seemed to think I shouldn't be able to turn only one wheel if I jacked up one side of the rear. I'll keep you all posted. You would think a truck with the FX4 off road package would be able to drive on wet grass in 2WD without getting stuck.
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Old 07-18-2006, 11:43 AM   #13 (permalink)
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Re: Limited Slip Differential

[ QUOTE ]
[ QUOTE ]
I tried this with the tranny in neutral and only one tire and the drive shaft spin at a time.

[/ QUOTE ] You don't have a L/S

[/ QUOTE ] Let me rephrase that; You don't have a functional L/S. How many times have you been stuck and or spinning with one rear wheel?
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Old 07-18-2006, 12:14 PM   #14 (permalink)
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Re: Limited Slip Differential

fwiw, I have (very) limited slip on my 2000. I've never been happy with it. I can spin the tire on a soft shoulder if one tire is on pavement and one is on the dirt shoulder. I only have 2wd. What I have found beneficial is to start out in 2nd gear instead of 1. Seems that first gear in the auto is pretty low, so starting out in 2 doesn't spin the tire at all. This has gotten me out of several jams.
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Old 07-18-2006, 02:30 PM   #15 (permalink)
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Re: Limited Slip Differential

Finesse is a virtue [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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