Changing diff fluid, do I need LSD additive?
JK Enthusiast
Joined: Jun 2009
Posts: 378
Likes: 0
From: Colorado Springs, CO
I'm soory... I have the ture-lok... I wrote track-lok by mistake. From the build list;
4:1 Rock-Trac HD Part Time 4WD Sys
Next Gen. Dana 44 HD Front Axle
4.10 Axle Ratio
Next Gen. Dana 44 HD Rear Axle
Tru-Lok Front & Rear Axles
4:1 Rock-Trac HD Part Time 4WD Sys
Next Gen. Dana 44 HD Front Axle
4.10 Axle Ratio
Next Gen. Dana 44 HD Rear Axle
Tru-Lok Front & Rear Axles
JK Super Freak
Joined: Nov 2007
Posts: 1,108
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From: SLC, Utah
JK Jedi Master
Joined: Feb 2008
Posts: 12,904
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From: Maine
JK Super Freak
Joined: Nov 2007
Posts: 1,108
Likes: 1
From: SLC, Utah
JK Jedi Master
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
Sorry for being unclear, in post 2 I reported that you needed friction modifier even if the Gear Oil already had it, as that's what the Dealer told me when I asked. After, posts 4, 7, and 8 I reported that I learned something in post 12 where I quoted my own post 2, revoking my original statement in post 2. I am not sure I am the one who did not read all the posts.
I have noticed, though, a lot of people don't read all the posts.
JK Enthusiast
Joined: Aug 2007
Posts: 117
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From: SE Pa.
Don't quote me on this because im definitley not a mechanic but I don't think Rubicons require an additive. The Trac-Lok is a clutch type LSD and requires a friction modifier for the clutches, Tru-Lok which is used in your Rubi is gear driven so I dont think it would require an additive.
JK Jedi Master
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
If some was added, it wouldn't hurt anything.
JK Enthusiast
Joined: Jun 2009
Posts: 378
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From: Colorado Springs, CO
JK Enthusiast
Joined: Aug 2007
Posts: 117
Likes: 0
From: SE Pa.
Service manager? He doesn't turn wrenches, and usually knows extremely little about working on the vehicles. Shop foreman or a Technician is who you need to talk to. 
Btw it does not need additives, it's treated like a open differential. However, I am running Synthetic fluids, which never need a LSD additive anyway.
Btw it does not need additives, it's treated like a open differential. However, I am running Synthetic fluids, which never need a LSD additive anyway.
Last edited by 08blkrubi; Aug 5, 2009 at 06:41 AM.
JK Junkie
Joined: Sep 2007
Posts: 3,306
Likes: 1
From: Long Island, NY
all the writer was trying to do was charge you for the additive.. the tech, knowing a lot more than the wrtier, would not have added the additive (prob put it in his toolbox since you paid for it) and you would have left their thinking you now always need the additive.