LSD Not working - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 02-09-2012, 08:58 AM Thread Starter
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LSD Not working

My truck has roughly 141k. I bought it a few years ago at 127k and am not sure if the LSD ever worked. A few weeks ago i was out offroading a bit in the sand and I noticed that the limited slip was not working. One wheel was spinning just digging into the sand.

Maybe 6 months ago I swapped out the fluid in my differential and replaced it with Royal Purple. I don't remember the exact weight but it was the recommended weight listed on this forum. I also read that with Royal Purple you did not need the limited slip additive that you normally add to the oil. Could this be my issue? Should I try adding the additive?

Last edited by z28gsxr; 02-09-2012 at 09:15 AM.
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post #2 of 7 Old 02-09-2012, 09:06 AM Thread Starter
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Do they all come with a factory limited slip? i have an 02 f250 lariat 7.3L auto 4x4.

Last edited by z28gsxr; 02-09-2012 at 09:35 AM.
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post #3 of 7 Old 02-09-2012, 09:30 AM
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You're right - I looked up the RP Max Gear and it says it's formulated for LSD use. So...it could be your limited slip isn't working.

I don't know what year your truck is, but from the '01 F350 Owner's Manual, it states:
"2 Add 236 ml (8 oz.) of Additive Friction Modifier C8AZ-19B546-A or
equivalent meeting Ford Specification EST-M2C118-A for complete refill
of Traction-Lok axles."

So...does RP Differential oil meet this Ford Spec? Would it hurt to add it? I wouldn't think so. Plus, it might be a cheaper way to check before having it torn down.

You can check your truck's owner's manual here:
https://www.fleet.ford.com/maintenan...ls/default.asp Look under Fluids and Specifications.


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post #4 of 7 Old 02-09-2012, 09:31 AM Thread Starter
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Its a 2002 f250

Last edited by z28gsxr; 02-09-2012 at 09:35 AM.
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post #5 of 7 Old 02-09-2012, 09:40 AM
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No they don't all have limited slip.
The clutch's have most likly worn out, with that kind of milage.
Not that hard to do, hardest part I had was getting the right parts.
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post #6 of 7 Old 02-10-2012, 06:15 AM
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Are you sure your truck came with that option? Check out the tag on the diff cover. I don't off the top of my head remember what you should look for, possibly an "L" before or after the gear ratio listed on the tag.

The additive would actually cause a Ford limited slip to "slip" MORE... it's designed to keep down the "chatter" while turning by letting the clutches slip past each other.

Will

2001 F250 CCSB Lariat 4X4
7.3 PSD, 4R100
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post #7 of 7 Old 02-13-2012, 08:54 AM
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This is something I need to address on mine as well. I have an 01 f250 4x4 w/off road package and mine does the one tire frier as well. Most likely needs a rebuild. Mine has 152k on it.
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