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Trac-loc gear oil


kimcrwbr1

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I put a limited slip differential in my truck and was looking for the best oil to add to the axle. Will 90-w with a friction modifier be good enough. I bought a used l/s carrier and 3.73 ring and pinion and have it dialed in pretty good preload, run out and gear pattern but didnt put new clutches in until I see how well it performs. Any input appreciated.
 


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kimcrwbr1

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I have a gallon of volvo penta 75w90 synthetic I was thinking of putting in the axle. Is the additive necessary if you use a high performance sync?
 

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It should say on it if you need to add friction modifier or not.

75/80w90 will be fine.
 

kimcrwbr1

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Either run 80w-90 with 4oz of Motorcraft friction mod (like 5 bucks at the dealer) or run 75w-140 synthetic with no friction mod.

Putting a used Trac-Lok in is about as useful as tits on a boar.

Either put new clutches in or a locker. There is a article in the tech library about using extra clutches to stiffen up the Trac Lok.
-PlumCrazy
 

shane96ranger

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I noticed the Valvoline 80W-90 says "for limited slip" right on the bottle. I assume that means no friction modifier is necessary for it either.



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I run it to be safe. I even run it with my locker.

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shane96ranger

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I'm not claiming to know anything.... but it seems to me that somewhere I've heard or read that too much is a bad thing. Is that true?

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It grips harder if you run too much. It will grip then slip then grab again.

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It will grip less if you run too much....
 

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Got this from Valvoline's website:

Valvoline High Performance Gear Oils meet or exceed API Services GL-5 and GL-4*. The inclusion of Limited Slip Friction Modifier in this product makes it unnecessary to add additional friction modifier (Ford M2C118A, Chrysler MS-5630, or GM1052358) in most vehicles.
http://www.valvoline.com/pdf/high_performance_gear.pdf

On a side note, down at the bottom it mentions a Valvoline Syncromesh for manual transmissions was released in September..... might need to give that a whirl.
 

kimcrwbr1

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Well I should have gone with my first instinct. The clutches are shot time to break it back down. I can spin one wheel by hand with the other on the ground in neutral with little resistance. I kind of expected it just got in a hurry before the rain sets in. Will it hurt to run it like it is until I get new spiders and clutches together its basically just a open carrier as it is. Oh well live and learn the school of hard knocks
 

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It will grip less if you run too much....
You are correct.....I am an idiot.lol I described exactly what a Trac lok does with straight gear oil.

-PlumCrazy
 

kimcrwbr1

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I just got the clutch set for my 7.5 trac-loc. I got 6 steels and 8 frictions is there any particular order that works the best. I will pull the carrier out tomorrow and remove the ring gear to get the spring out any advice on setting up the clutch packs would be appreciated.
 


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