Trac-Lok friction additive

[Deleted member 30519]

I have a sport with the Trac-Lok in the rear and I just got 5.13 Yukon gears installed last week. I'm approaching the 500 miles and I'm supposed to drop off the JT monday for a fluid change but I have no idea what kind of additive I need. I was going to go with the Lucas 85w-140 because I heard it already has the additive in it but I'm not 100% sure. Any help would be appreciated.

https://www.autozone.com/greases-an...roducts-85w140-hd-gear-oil-1-quart/693859_0_0

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[DAVECS1]

I used BG Synchromesh and no additive and it has been quite and flawless.​

 

[Deleted member 30519]

I used BG Synchromesh and no additive and it has been quite and flawless.​

I'm talking about the JTs with Trac-Lok. Don't you have a Rubicon?

 

[DAVECS1]

No. I have a Sport S that I built up, and installed my own trac Lok as the original Max Tows did not have them

 

[jay21mojave]

Are you still running the Factory Trac Loc.. if so get the additive from MOPAR at the dealer. Just got the Mojave so it will be a while before I need to change the lube.. BTW...I go with Amsoil Synthetic Gear Lube with Yukon gears and Yukon limited slip unit in my JKU.

 

[Deleted member 30519]

Are you still running the Factory Trac Loc.. if so get the additive from MOPAR at the dealer. Just got the Mojave so it will be a while before I need to change the lube.. BTW...I go with Amsoil Synthetic Gear Lube with Yukon gears and Yukon limited slip unit in my JKU.

The dealers closed on Sunday and I'm supposed to drop it off in the morning before work. Anything else I can use besides Mopar?

 

[just_another_guy]

There is a factory additive that you can get from the dealer, but many gear oils will already have something in them and not need it. I am using Amsoil severe gear 75w90 and was told by Amsoil not to use the Mopar additive.

 

[Deleted member 30519]

There is a factory additive that you can get from the dealer, but many gear oils will already have something in them and not need it. I am using Amsoil severe gear 75w90 and was told by Amsoil not to use the Mopar additive.

That's what I figured I could do with the Lucas HD 85w-140 because many say it already has the additive but my only concern is I have the the clutch type LSD and some say that type of LSD should always have a additive regardless of the gear oil claiming to have it. I already bought the Lucas so my only dilemma now is finding a additive equivalent to the mopar one so I can drop this thing off in the morning. I've been driving it for a week since my re-gear and don't really wanna chance it.

 

[just_another_guy]

That's what I figured I could do with the Lucas HD 85w-140 because many say it already has the additive but my only concern is I have the the clutch type LSD and some say that type of LSD should always have a additive regardless of the gear oil claiming to have it.

That would be a question for Lucas, but I contacted Amsoil about that and they told me I did not need any LSD additive. They are a pretty legit company who I trust, and I haven't had any issues with the trak-lok since switching oils.

 

[jay21mojave]

Given the situation, have the Lucas installed, contact Lucas this week and ask the question. If they recommend then you can easily suck a few oz out thru the fill hole and add. Going a few days w/o the additive should not damage or hurt.. Just My Opin.

 

[ShadowsPapa]

Given the situation, have the Lucas installed, contact Lucas this week and ask the question. If they recommend then you can easily suck a few oz out thru the fill hole and add. Going a few days w/o the additive should not damage or hurt.. Just My Opin.

A cheap baster from Walmart and some hose on the end will allow a person to withdraw fluid pretty easily. I also have a case of suction guns I need to sell if someone wants one. It's like a grease gun but instead of the normal works on the end, it simply has a clear hose. Insert the hose into the transmission, differential, whatever and pull the handle and it sucks large quantities of lube out.

I use fluids that are marked for limited slip differentials - I use that same fluid in all of my cars regardless of LSD or not so I only have to stock one fluid.

 

[ShadowsPapa]

That would be a question for Lucas, but I contacted Amsoil about that and they told me I did not need any LSD additive. They are a pretty legit company who I trust, and I haven't had any issues with the trak-lok since switching oils.

Some, and they may be one of them, are already rated for clutch and cone type LSD. All I buy are lubes that say right on the container "suitable for ........... additive not required".
I suspect Amsoil has the additive.

 

[just_another_guy]

Some, and they may be one of them, are already rated for clutch and cone type LSD. All I buy are lubes that say right on the container "suitable for ........... additive not required".
I suspect Amsoil has the additive.

The packaging says "Use in standard and limited-slip differentials" and then lists all the specifications for Ford, GM, Chrysler, etc.

Below that it states "For applications that require additional limited-slip friction modifier, add AMSOIL Slip Lock"

But again, I emailed Amsoil about this specific application (max tow) and was told not to use the additive, which seems to be working well so far.

 

[ShadowsPapa]

The packaging says "Use in standard and limited-slip differentials" and then lists all the specifications for Ford, GM, Chrysler, etc.

Below that it states "For applications that require additional limited-slip friction modifier, add AMSOIL Slip Lock"

But again, I emailed Amsoil about this specific application (max tow) and was told not to use the additive, which seems to be working well so far.

I've noticed these are a lot different than the legacy LSD systems I'm used to.
You CAN turn one wheel on these - and the other will rotate the opposite way.
The test for "how do I know if I have limited slip" used to be - raise the rear of the vehicle and turn one wheel. IF the other turns the same way it's limited slip, if it turns the other way, it's open differential".
That USED to be the test and it held for decades - and it's still touted as the test to this day.
HOWEVER, I have LSD, I ordered it that way, the build sheet shows it, the window sticker shows it and it acts like LSD on ice.
But I can turn the left wheel in the normal direction for forward and the right wheel turns backwards. It's got a different feel, though - not easy to turn like an open differential. Open diffs you can turn one wheel very easily and the other wheel turns the other way- easily. This takes some effort to turn one wheel but the other wheel turns the opposite direction.
I've not found any tech specs or overhaul information like I can on other LSD systems.
Old school was - raise one wheel, remove tire/wheel, put a torque wrench on the axle and it should take xx pound/feet of torque to break it loose due to the preload on the clutches.

These are quite different. I can "break" it loose by hand, but the other wheel turns the opposite way, not the same way. And the feel is different - there's drag but not an even drag.

 

[just_another_guy]

I've noticed these are a lot different than the legacy LSD systems I'm used to.
You CAN turn one wheel on these - and the other will rotate the opposite way.
The test for "how do I know if I have limited slip" used to be - raise the rear of the vehicle and turn one wheel. IF the other turns the same way it's limited slip, if it turns the other way, it's open differential".
That USED to be the test and it held for decades - and it's still touted as the test to this day.
HOWEVER, I have LSD, I ordered it that way, the build sheet shows it, the window sticker shows it and it acts like LSD on ice.
But I can turn the left wheel in the normal direction for forward and the right wheel turns backwards. It's got a different feel, though - not easy to turn like an open differential. Open diffs you can turn one wheel very easily and the other wheel turns the other way- easily. This takes some effort to turn one wheel but the other wheel turns the opposite direction.
I've not found any tech specs or overhaul information like I can on other LSD systems.
Old school was - raise one wheel, remove tire/wheel, put a torque wrench on the axle and it should take xx pound/feet of torque to break it loose due to the preload on the clutches.

These are quite different. I can "break" it loose by hand, but the other wheel turns the opposite way, not the same way. And the feel is different - there's drag but not an even drag.

I care more about how it operates when I'm driving the truck. It doesn't engage at all when on pavement but starts to skid the tire a little when making sharp turns on loose surfaces, which I feel is appropriate. When winter hits and we get some ice/snow I'll see how it performs on that as well.

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