Or add a bottle of GM limited slip or positraction (yes, they are different) additive.
Power lok differential
- Thread starter Buster247
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mickeykelley
Well Oiled
But that’s GL5. I thought that was a nono
muleskinner
Sharpest Tool
I mentioned this before about power lok gear oil in your build thread Mickey. I used the Castrol brand posi traction gear oil purchased at O'Reilly's. This stopped the popping sound in a turn. I tried a few different additives that didn't work so finally changed the oil and put Castrol limited slip. You got a short memory.
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mickeykelley
Well Oiled
I thought I had gone down this path but searches even for me posting didn’t come up. But thank you for posting again.
cwdtmmrs
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- Jul 19, 2012
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- Tim
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- 1952
Yeah Mike. I have 2 bottles of additives in each diff and lots of figure "8's: to get the noises to stop.
Don't be hard on Mickey, his memory is the 2nd shortest thing he's got!
cwdtmmrs
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- Jul 19, 2012
- 6,406
- First Name
- Tim
- Willys Model
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- Willys Year:
- 1952
Supposedly, only if you have yellow metal, and there is no yellow metal in a diff.
The yellow metal thing is a myth carried over from decades ago anyway.
muleskinner
Sharpest Tool
Those additives are more expensive than a full quart of Castrol purchased at O'Reilly's. To pore in the additives you have to draw out equal amount otherwise there is no room for the additives. Unless the differential was low on oil. I used a hypodermic syringe to draw out the oil to make room for the additives.Yeah Mike. I have 2 bottles of additives in each diff and lots of figure "8's: to get the noises to stop.
Don't be hard on Mickey, his memory is the 2nd shortest thing he's got!
The additives on the left to me were snake oil - waste of money.
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Which is why I recommended the GM additive. Ford sells an additive as well.
Andy FitzGibbon
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As does Mopar. And it does work.
JABJEEP
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- Sep 20, 2017
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- Jeff
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- CJ
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- 1955
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- 1962
Is the additive really necessary if you buy the gear oil that’s stated as being safe for limited slip differentials?
cwdtmmrs
Well Oiled
- Jul 19, 2012
- 6,406
- First Name
- Tim
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- Willys Year:
- 1952
I am pretty sure I started with a LS oil. I was getting the clicking/popping noise on turns like @muleskinner was. I went to a differential shop near me and got a little bottle of green stuff additive, maybe 2oz. Smelled nasty. Wound up using 2 bottles and lots of figure "8" to make the Powr Lok quiet. Was told that regular gear oil was too slippery for the clutch pack.
That was a long time ago. maybe oils are better today?
JABJEEP
Well Oiled
- Sep 20, 2017
- 5,900
- First Name
- Jeff
- Willys Model
- Wagon
- Pickup
- CJ
- Willys Year:
- 1955
- 1958
- 1962
I had the same exact experience with my '78 Wagoneer with the Quadra-trac, including the figure 8's. The manual calls it slip-stick condition. I don't recall adding an additive, I just changed the fluid with the expensive dealer stuff. It worked good after that until I sold it a couple of years later.
cwdtmmrs
Well Oiled
- Jul 19, 2012
- 6,406
- First Name
- Tim
- Willys Model
- Wagon
- Willys Year:
- 1952
For sure I bought an off the shelf oil from Pep Boys.
diggerG
Well Oiled
Generally, if the oil can says clutches and gears you are good. If not, NO USE.
mickeykelley
Well Oiled
@muleskinner your picture does not show GL5 on the front but all the ones at O'Reilys now say GL5. Is there a difference or is yours just older?
Or this at Amazon https://www.amazon.com/CASTROL-INC-...cphy=9028023&hvtargid=pla-2281435176698&psc=1
Or this at Amazon https://www.amazon.com/CASTROL-INC-...cphy=9028023&hvtargid=pla-2281435176698&psc=1
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muleskinner
Sharpest Tool
The limited slip additives aren’t snake oil, they were made to be added to regular gear oil that didn’t have the additives included.
muleskinner
Sharpest Tool
Yes no reason to add the special gear oil additives when the limited slip oil is cheaper. Plus with the Power Lok in the Front D25 only takes 1 quart . So why not put the right limited slip oil in the differential - like drain it and squirt in the right oil in the first place. And do the figure 8's about 10 times to immerse the friction modifier oil into the clutch packs.
The need for additives used to be much more common. It was less common to find gear oil that included the limited slip formulation. Now it’s rare to see GL5 gear oil that doesn’t have it, but the additives live on.
I believe the principal difference between GL-4 and GL-5 is the inclusion of friction modifiers for limited slip differentials in GL-5. Early formulations of GL-5 with these additives were supposedly corrosive to brass and bronze. Most now are "yellow metal safe" and work just fine. I believe the whole corrosion issue to be massively over done. I've never seen any damage.