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  #25  
Old 04-15-2013, 08:25 PM
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Re: Still moaning a bit !!!!!

Aha, so it actually enables slipping.
There should be a kind of a preload inside vari-lok. And this is where additive is needed -> to enable slipping without excess wearing, I suppose?
But, "no additive" should not mean it's completely locked? Not before there's some pressure, caused by the speed difference? I assume it's "locked" only that much as the preload pushes the plates?
(Which could cause this feeling, I'm having right now - like it's close to engage but it isn't... but there is additive -> it should slip... I feel I'm now in a squirrel wheel...)
When there's a speed difference, "pumps" will create some pressure to close the plates? -> wheels will turn at same speed.

Either
-additive has no effect??
or
-too much pressure? Why?

Got more stronger feeling all the time, I have to start from the beginning -> change the fluids...

PS. I believe this, CRO4318060 is the one I had. There seem to be a Mopar number on that www page as well, MOP5103522EA.
I wonder if I can order Mopar additive from anywhere? But is it actually the same fluid in a different can?
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  #26  
Old 04-16-2013, 09:28 AM
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Re: Still moaning a bit !!!!!

No, there is no preload on the clutch plates inside the vari- lok. This would only increase the wear on the plates. Only with pressure from the pump inside the vari-lok the clutch should engage. The limited slip additive is only there to be able to make turns and have a certain amount of slip to enable the speed difference between the two wheels on the same axle. Are you sure there is no tire wear difference between the both rear tires?
But if the vari-lok is(partially) locked when starting to turn the wheel by hand, then there is some kind of problem with the vari-lok. It could be fluid related, but the fluid you had put in is the right one. Mopar limited slip additive is available on Amazon or e-bay.
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  #27  
Old 04-16-2013, 10:17 AM
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Re: Still moaning a bit !!!!!

Yes, no preload.. had to read the manual again... They're just talking about Trac-lok in a middle of a Vari-lok chapter.

Tires... have been changed between front/rear. As You know, we have to use winter tires during winter, so tires has to be changed at least twice a year.
And... there should be quite a big difference between diameters, before there's really effect. When using similar tires on all corners. And, when I tested, I stopped right after the sound was too bad -> no pressure at all.
And, if we think about this, when turning as much as You can with the Jeep, how many rounds can be driven with the one which is really in order? Every Vari-lok's should engage after a few rounds? Right?
And, compared to turning, tire wear is nothing.

Vari-lok is not locked?? At least, I'm able to turn both tires to opposite directions. But only for a few spins.
As manual states, "within 5 spin should start...", within 5 spin it's locked. Just a bit sticky to spin.
Engages fine, but too fast/early...

What about this: "a torque-limiting pressure relief valve "??
Some dirt in?
Yes, I was careful, new clean rags were used, when diff was open and I cleaned it a bit from inside.


I'll know a bit more after fluids have been changed.
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  #28  
Old 04-20-2013, 07:48 AM
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Re: Still moaning a bit !!!!!

Right, now I got some time to browse the internet.

So about the oils, actually additives.
What I found from our local guys web page, there's two choices.
- CRO4318060
-
MOP5103522EA

So, a short glance to a manual - there's no part numbers for that.

More browsing, from the ebay I can find for example Quirk parts, but they're selling Mopar additive
-
04318060AB
as, a couple of others do.

So, does anybody know what's the difference between those three?
All sellers on Ebay are telling it's the only, approved. Could be, can't argue.

But what for are actually those two other numbers, I listed?


Edit: ... just found that this...60AB replaces the old numbers... so I ordered a few of them
Now, the only question is whether this CRO... additive is suitable?
Well, I'll be at home after a week, might have those additives waiting, so we'll see...
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  #29  
Old 04-20-2013, 09:30 AM
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Re: Still moaning a bit !!!!!

CRO4318060 is a product from Crown automotive, but is limited slip additive for trac lok. Not sure if this will work out well for vari lok.
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  #30  
Old 06-02-2013, 03:29 PM
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Re: Still moaning a bit !!!!!

Sorry guys, I've been travelling, summer came -> had to fix motorcycle & ride a bit, end of a school for kids, ....
But, A short update...

I ordered original Mopar additive... got a couple of bottles Castrol oil for such a rears. There's some Castrol additive for limited slips... I believe it's this (don't have the can right now), Castrol Syntrax limited slip 75W 140.
I checked the amount of additive from those sheet metal plates, bolted to a rear, yes, 4oz.

So, cover out from the rear... oils out... then I started to rotate wheels... about 1 round (a bit less to be exact) and both wheels were rotating to a same direction -> it was locked. I repeated that a few times... 6?? Then the last "gargle"?? Pump was empty, no locking any more and wheels felt like in a regular rear - didn't have to use too much force to rotate.
By the way, 1 round... if really turning as much as You can, 1 round difference is not too much.
Anyway, cleaning.. cleaning... carefully silicone to cover and close it.
Oils in... then, as instructions at Castrol's site tells, in case of Jeep... add 2 oz mopar additive.
And now one interesting thing.. when I bought this, I asked why the additive is there... sales person said, it's there because it INCREASEs grip!! So as what we discussed here about... mopar additive decreases it??? What's really right?
Back to the jeep... test run... 'bout a mile, left turn, all I could - same sound -> back to home and a can of a beer...
Then because of many things... I didn't have time to play with that... but finally, a couple of weeks & 'bout 60miles of driving... Castrol & additive is, for sure, mixed... same crossroad, all to the left - NO sound!!! It's like it was. ?????
An other good reason to get a can of beer...

So, basically, nothing has changed, first oil change, original Mopar oil + additive - now Castrol + less additive???

Who's a clairvoyant... could he/she tell what happened?


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  #31  
Old 06-23-2013, 12:02 PM
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Re: Still moaning a bit !!!!!

I had the moaning turning left on my 2003 grand crd. Turned out to be the drive shaft from the transfer case to the front diff. The cv type joint was worn the big one that bolts to the diff.
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  #32  
Old 06-23-2013, 02:04 PM
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Re: Still moaning a bit !!!!!

I think that they have to change their sales person, because the limited slip additive (or friction modifier) is there to allow the clutches in the diff to slip a bit, just enough to prevent tire rub in tight turns. Without the additive ,the clutches will lock completely, causing one of the wheels on the same axle to rub on the pavement.
Didn't understand when you said: "no sound" after 60 miles of driving. I thought that the problem was the sound when making tight turns, so when no sound = ok
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  #33  
Old 06-23-2013, 02:56 PM
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Re: Still moaning a bit !!!!!

Exactly... no sound anymore!!!
Seems to be OK now.
The "60 miles" is that far only because I didn't check it earlier. I belive.
But right after oil change, "rubbing" existed.

So now I'm a bit confused, what was the reason?
Or is Castrol + Mopar add. better mixture that mopar oil + crown?

One thing I've been thinking of is silicone. As the cover was sealed with the silicone... could it be possible that a tiny part were somewhere inside the pump?
In this time, when I changed oils, I rotated wheels so far the pump was empty and I heard kind of a sound, pump was pumping air.

Anyhow, I'm kind of a happy guy as I didn't have to get any new parts. As what I checked, a new diff. lock would have been a lot more than 1k$.
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Old 06-23-2013, 04:56 PM
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Re: Still moaning a bit !!!!!

If you previously used the crown CRO4318060 additive, then that could be the reason, because that one is for Trac-loc diffs and not for Vari-loc diffs. No idea what the difference is, because its still limited slip additive, but it probably has different friction modifier properties.
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  #35  
Old 06-25-2013, 07:22 AM
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Re: Still moaning a bit !!!!!

transfer case noise sounds alot like rear end noise!!!!!!!!!!!!!
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Old 11-26-2013, 05:31 AM
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Re: Still moaning a bit !!!!!

Quote:
Originally Posted by civilwizard View Post
transfer case noise sounds alot like rear end noise!!!!!!!!!!!!!
I recently changed my transfer case fluid and it stopped the chatter but it has now returned - I did read elsewhere that a tip is to use some friction modifier in the T-Case also?
Would anyone recommend this or has even tried it as I had ATF4 in my T-Case previously and I used T-Case oil from Mansfield 4x4 in my 247.
Cheers
Paul.
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