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Old Jun 19, 2009 | 06:59 PM
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desert sled
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Limited slip question.

How do I know if I have a Limited Slip Differential. Also, how much friction modifier do i use? I have a 2002 f-250 cclb. Thanks.
 
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Old Jun 19, 2009 | 07:09 PM
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Look in the driver's door jamb. Under "AXLE" it should say "C1" or "31". C1 = 3.73 LS, 31 = 3.73 Non-LS. If the sticker is gone, look at the diff for a tag. Somewhere on there it says 3 73 or 3L73. If the L is there you have a LS diff...

I used Royal Purple with it already in there. But I believe it's 4 oz. But start with 2 oz. and see if there's chatter. If it chatters, add 2 more oz.

EDIT: Oh, and you might look at the '08 diff cover. It's pretty nice, and not too pricey:
 
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Old Jun 19, 2009 | 07:10 PM
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Originally Posted by desert sled
How do I know if I have a Limited Slip Differential. Also, how much friction modifier do i use? I have a 2002 f-250 cclb. Thanks.
The easiest way is to check your Oasis report and see if its listed in the build data.
 
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Old Jun 19, 2009 | 07:28 PM
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thanks for the info!
 
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Old Jun 19, 2009 | 07:56 PM
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how much was that diff cover and where did you get it?
 
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Old Jun 19, 2009 | 08:01 PM
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Let's see if this link works... I got mine from Ed "FTE Parts Guy", but since then he got laid off. I understand he's at Y2K Parts. I paid ~$55 shipped to my door, but you need longer bolts (1 1/4") since the cover is thicker than the standard steel one. Here's the link (you want the 6.4L one, obviously):
Y2KFORDPARTS
 
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Old Jun 20, 2009 | 06:50 AM
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thanks i love the way it looks
 
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