I Have An LSD! - Ford Powerstroke Diesel Forum
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post #1 of 35 Old 04-18-2012, 07:31 PM Thread Starter
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I Have An LSD!

So I was thumbing through the forums when I saw somebody mention the sticker on the door where it says your gear ratio and if you have LSD or not. I always figured that I had an open diff because I'm always spinning one wheel when I'm stuck in the sand in 4X2 So I went and looked at my door sticker just for the hell of it and it says "3L" that means I have a 3.73 Limited Slip

I did some more reading and found that Ford puts way too much friction modifier in the diff from the factory to limit warranty claims from chatter of the LSD. This weekend I'm going to drain and clean the rear diff and check out the clutches, refill with Motorcraft 75W-140 Synthetic Rear Axle Lubricant ($20 a quart ) and just a little XL-3 Friction Modifier Additive I hope it works!

Of course thats after I install my harley headlights and grille

Saturday can't come fast enough!

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post #2 of 35 Old 04-18-2012, 07:47 PM
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I like the Royal Purple 75w140. I used that when I put the '08 diff cover on my truck. It has the modifier built in and I have no problems with my rear end at all.
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post #3 of 35 Old 04-19-2012, 02:36 AM
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so where exactly is this sticker located?

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post #4 of 35 Old 04-19-2012, 04:38 AM Thread Starter
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Originally Posted by Banshee365 View Post
I like the Royal Purple 75w140. I used that when I put the '08 diff cover on my truck. It has the modifier built in and I have no problems with my rear end at all.
My friend used that in his F150s diff and loves it. I'm going to stick with the Motorcraft just because I don't want the friction modifier pre added. I want to add just a little and add it as I see fit, just to get the clutches working properly.

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so where exactly is this sticker located?
It says it on the sticker in the drivers door sam. It will say either 3R, 3L, 4R, or 4L. The 3 means you have 3.73 gears, the 4 means you have 4.10 gears, L means Limited Slip, and R means one-wheel drive!

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post #5 of 35 Old 04-19-2012, 07:57 AM
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adding "a little bit" is not the answer. like anything else there is a correct amount to put in, then add whatever synthetic fluid you like.
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post #6 of 35 Old 04-19-2012, 08:10 AM Thread Starter
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adding "a little bit" is not the answer. like anything else there is a correct amount to put in, then add whatever synthetic fluid you like.
mike
Ford says to add 8oz of the friction modifier but many guys on here will agree that that is too much. Ford adds more than what is truely needed to avoid customer complaints about "chattering" from the clutches engauging on the LSD. I read a few threads on here where guys recommend adding 2oz of the modifier and then add another ounce at a time until the chatter is just about gone and the LSD engauges properly.

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post #7 of 35 Old 04-19-2012, 08:32 AM
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Quote:
Originally Posted by mazsecond View Post
Ford says to add 8oz of the friction modifier but many guys on here will agree that that is too much. Ford adds more than what is truely needed to avoid customer complaints about "chattering" from the clutches engauging on the LSD. I read a few threads on here where guys recommend adding 2oz of the modifier and then add another ounce at a time until the chatter is just about gone and the LSD engauges properly.
I added 4oz to start with.
I need some more now, as the clutches aren't slipping properly now

My Samsung SGH-I997 made me send this.



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post #8 of 35 Old 04-19-2012, 08:44 AM
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My The 4L can also mean 4.3 gears that come with the tow boss package.

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post #9 of 35 Old 04-19-2012, 09:35 AM
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How are you going to check the clutches without tearing the diff out and disassembling it. And if you go that far you might as well put new clutches in. A lot of guys will rebuild it installing an extra clutch on each side to tighten things up. I always do. Use the best clutch from the old setup on each side.
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post #10 of 35 Old 04-19-2012, 10:03 AM
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Will an LSD out of a single wheel truck fit a DRW or do they have different axles??

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