Trac-Lok friction additive

[DAVECS1]

These limited slips are not preloaded with a spring. It takes a fair bit of torque bias to lock them up. I would even step out on a limb and say the additive is not that crucial in these being not pre loaded. Noise will not be a huge concern and less additve will lead to better lockup

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[ShadowsPapa]

These limited slips are not preloaded with a spring. It takes a fair bit of torque bias to lock them up. I would even step out on a limb and say the additive is not that crucial in these being not pre loaded. Noise will not be a huge concern and less additve will lead to better lockup

That's exactly what I figured after checking mine out. Other designs I've worked with had cones and springs, and the early design used by AMC (and they later sold their differentials/designs/etc. to Dana) had wave plates in among the friction disks and plates, giving them a fair preload. Forget the friction modifier on those and you had noise and short life.

I'd personally use - in my own - a fluid like Amsoil or others that said they were for LSD operation. I did that with my cars and skipped the additive.
That's what I've done in my 73 with limited slip and that thing gets abused and pounded on hard. I did the same for my disk type model 20 under my 70. Never had any issues and when I restored it for later show and sale, it looked like new inside. It would leave 2 perfectly identical black tracks all the way across the 4 lane when I nailed it and was quiet around corners.

 

[Deleted member 30519]

Thanks for the help guys. I called Lucas this morning and they said what most say. It already contains an additive and if I hear any noise afterwords just get 4-6oz of additive in.

 

[WXman]

The Valvoline gear oil at Walmart comes in the awesome pouches instead of bottles (way easier!) AND it has friction modifier already in the fluid.

 

[Deleted member 30519]

The Valvoline gear oil at Walmart comes in the awesome pouches instead of bottles (way easier!) AND it has friction modifier already in the fluid.

That's what I just meant for the Lucas HD. The "friction modifier." I don't know why I said additive.

 

[Mac]

Manual recommends sae 75w85 gl-5 with a friction modifier if you have the Trac-Lok limited slip.

 

[ShadowsPapa]

Someone posted a response from Jeep that said 75w140. I tried to compare the sales codes and decided that it applied to my Overland with trac-lok
It was in a thread about which lube to use - Jeep responded basically with 75w140 The sales codes mentioned matched my truck.

 

[Mac]

From the manual

 

[Deleted member 30519]

Idk... the shop I used for my re-gear is a reputable place and they use 85w-140 unless they screwed up when they were telling me. They never mentioned anything about friction modifier either. It's going it today. I already dropped it off. I guess if I here anything I'll take it back and get some put in. It's been a rough day. My tazer live function stopped working after I stopped at store on my way to work and my shifting felt horrible so I'm assuming the unit was not syncing properly with the JT. I pulled over and had some codes with a check engine but accidentally cleared them. I did a full reboot and got back to normal just in time to drop it off at the shop right next door to my job. I havnt even stepped into work andy blood pressure is probably sky high.

 

[Mac]

My understanding is the M220 is the only axle you can get on the JT with the Trac Lok.

 

[dcmdon]

A great tool for sucking out fluid as well as bleeding brakes is something called a MityVac. They are short money at about $30.

If you are a skinflint, you can get a knock off even cheaper at Harbor Freight.


https://www.amazon.com/MV8000-Autom...d=1&keywords=mighty+vac&qid=1628522342&sr=8-9

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