Testing varilocks in a Junkyard - JeepForum.com
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post #1 of 12 Old 11-21-2019, 02:03 AM Thread Starter
sdg3205
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Testing varilocks in a Junkyard

There's a local part out of a 2003 with varilocks. 150,000 miles.

I have no experience with the varilocks. Is there a way I can test the axles in the yard, assuming I can spin the tires freely?

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post #2 of 12 Old 11-21-2019, 02:31 AM Thread Starter
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If the drive shaft is disconnected I should be able to check the axles by chocking a wheel, turning the pinion and see the other wheel spin a bit before stopping to force the chocked wheel to turn, right?
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post #3 of 12 Old 11-21-2019, 05:36 AM
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That will test the pump, but you can't generate anywhere near enough input torque to test if the clutches are still good. Even worn out ones will clamp with enough friction to spin both tires when they're in the air. It's a damn shame that Dana/Jeep decided not to make the Vari-Loc non-rebuildable. Other clutch-type limited slips can be rebuilt with new clutches fairly easily. The parts used are very similar to the clutches found in automatic transmissions.

Vari-Loc diffs seem to be quite durable. Their main Achilles heel, like most clutch-type limited slips, is that driving long distances with slightly different height tires on the same axle will burn the clutches as they do their very best to keep both tires constantly rotating at the same speed. The only clutch-type limited slip that I know of that can avoid this is the Eaton Gov-Loc found mainly in GM truck rear diffs. It uses a complex flyweight and governor mechanism to A) only engage the clutches when there is a large enough difference in wheel speeds and then B) disengage the clutches at speeds over 20-25 MPH.
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post #4 of 12 Old 11-21-2019, 10:53 AM Thread Starter
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So it's just kind of a gamble eh? I was thinking of just grabbing the front axle as I'm leaning towards an eaton for the back.
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post #5 of 12 Old 11-21-2019, 12:42 PM
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If that jeep has the 4.7 H.O I'd buy the factory airbox if you're intrested
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post #6 of 12 Old 11-21-2019, 12:47 PM Thread Starter
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Testing varilocks in a Junkyard

Quote:
Originally Posted by xcaliber81 View Post
If that jeep has the 4.7 H.O I'd buy the factory airbox if you're intrested


Itís on my list! Iíll keep an eye out for you though.

I just want the filter box. Do you want the resonator?
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post #7 of 12 Old 11-21-2019, 01:08 PM
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Quote:
Originally Posted by sdg3205 View Post
Itís on my list! Iíll keep an eye out for you though.

I just want the filter box. Do you want the resonator?
My H.O airbox was removed for a k&n fipk that I've put an afe pro dry s filter onto I would need the whole thing if you could find one hard to find wj's in the junk yards locally here.
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post #8 of 12 Old 11-21-2019, 08:58 PM Thread Starter
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Do you want my non HO air box?
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post #9 of 12 Old 11-21-2019, 11:22 PM
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Quote:
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Do you want my non HO air box?
I don't need one that badly but thanks
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post #10 of 12 Old 11-23-2019, 01:26 AM Thread Starter
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Got the new HO filter box installed. Itís remarkably smaller. Bonus was it came out of a Jeep with brand new brakes and tune up. Air filter was brand new!
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post #11 of 12 Old 11-24-2019, 02:06 AM Thread Starter
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I know I'm off topic on my own thread, but I'm astonished at the difference the HO filter box made. I went in to this expecting no change, so imagine my surprise and pleasure when the engine note changed ever so slightly and I noticed a bump around 2.5k to 3.5k rpm.

The difference I take it to be a result of almost a foot less of ducting to the front of grill and a significantly larger diameter air inlet into the air filter box. I think the engine noise is more resonant under the hood with the opening to the filter box more central to the engine bay as opposed to out the front grill. The larger diameter opening to the filter box now more properly complements/matches that of the Airaid intake tube and 08 manifold. It's really nice. Damn I love this truck.
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post #12 of 12 Old 11-24-2019, 12:10 PM
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Quote:
Originally Posted by sdg3205 View Post
I know I'm off topic on my own thread, but I'm astonished at the difference the HO filter box made. I went in to this expecting no change, so imagine my surprise and pleasure when the engine note changed ever so slightly and I noticed a bump around 2.5k to 3.5k rpm.

The difference I take it to be a result of almost a foot less of ducting to the front of grill and a significantly larger diameter air inlet into the air filter box. I think the engine noise is more resonant under the hood with the opening to the filter box more central to the engine bay as opposed to out the front grill. The larger diameter opening to the filter box now more properly complements/matches that of the Airaid intake tube and 08 manifold. It's really nice. Damn I love this truck.
That's partly why I didnt want your non H.O airbox lol.
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