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Unread 12-16-2011, 11:49 PM   #1
cevans87
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T Case Question

So I know have a xj 231 in my yj that is attatched to an aw4 ...

when i try to shift on the fly from 2hi to 4hi i get a bad gringing noise and haven't been able to engage...

if i stop completely... shifts fine

if im in 4hi and shift on the fly to 2hi shifts fine...

i still have the cad system on the dana 30...

any info would be appreciated

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Unread 12-17-2011, 06:07 AM   #2
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I suspect the XJ tcase doesn't have the synchro in it that a YJ tcase would.

In non-vacuum disconnect jeeps the fron drive shaft is always spinning so the tcase doesn't need the synchro.
In YJ's with the vacuum disconnect axle the tcase needs to have the synchro in it to spin up the front driveshaft when you shift from 2HI to 4HI. Without the synchro in a YJ it's going to grind....
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Unread 12-17-2011, 06:24 AM   #3
Mark05059
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not sure what your talking about kloppk. My cherokee I could go in and out of 4x without any problems on the fly when I had my XJ.
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Unread 12-17-2011, 08:29 AM   #4
kloppk
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YJ's use the CAD axle disconnect. The tcase's in YJ's have a synchro in them to spin up the front driveshaft to avoid gear clash.

Earlier XJ's that had the same CAD axle disconnect used the same synchro system in the tcase.

Later XJ's did away with the CAD axle disconnect. The synchro was no longer needed since the front driveshaft is always spinning with a non-CAD axle. The same is true for all TJ's.

I suspect the OP has the later XJ tcase without the synchro in it. The tcase is trying to engage but without the synchro the teeth are not synchronized when the mode fork tries to engage the non-spinning front drivshaft.

I agree, all stock XJ's, YJ's and TJ's will shift on the fly with the factory (correct) tcase installed.

CAD axle YJ's & XJ's requires the tcase with a synchro
Non-CAD axle XJ's do not require a tcase with the synchro.

Please refer to the parts diagrams for tcases in CAD & non-CAD Jeeps.
You'll see the synchro in tcase in jeeps with the CAD axle.
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Unread 12-17-2011, 12:23 PM   #5
Apollo12227
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Quote:
Originally Posted by Mark05059 View Post
not sure what your talking about kloppk. My cherokee I could go in and out of 4x without any problems on the fly when I had my XJ.
Some XJ tcases came with a synchro some didn't. His doesn't seem to have one.

http://www.jeepforum.com/forum/f12/w...ft-fly-949926/
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Unread 12-17-2011, 02:51 PM   #6
Anticanman
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Sounds like you need a one piece conversion or just to lock the collar on the two piece system over and make sure your driveline is balanced. That'll solve your problem.
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Unread 12-17-2011, 04:40 PM   #7
cevans87
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sounds like a winner, thats what i was leaning towards was that the cad system played a big role and that i didn't have the synchro... but i needed it confirmed... kinda like tasking someone to look at the same picture to see if they see something you don't... thanks guys... will be swapping to dana 60's soon so untill then i just won't shift on the fly
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