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Old 07-30-2011, 06:25 PM   #1
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Location: Monterey, CA
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4WD/Transfer Case/Shift Motor

The shift motor vacuum lines are all broken in the area of the battery tray.
I've done the research and understand the color coding and where they should be. I've located the broken ends at the transfer case.

My questions:

When I throw the shift lever into 4H, the Jeep will hop around on tight turns, suggesting to me that 4WD is engaged.

My guess is that the shift lever manually engages the driver side of the axle and the shift motor locks the 2 sides of the axle together?

In this theory then, I am actually engaging one front wheel?

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Old 07-30-2011, 11:37 PM   #2
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Yes that is what happens when you go into 4wd, only one wheel pulls at a time unless you have a locker then both wheels will pull

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Old 07-31-2011, 12:21 AM   #3
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Quote:
Originally Posted by kindlingmaker
The shift motor vacuum lines are all broken in the area of the battery tray.
I've done the research and understand the color coding and where they should be. I've located the broken ends at the transfer case.

My questions:

When I throw the shift lever into 4H, the Jeep will hop around on tight turns, suggesting to me that 4WD is engaged.

My guess is that the shift lever manually engages the driver side of the axle and the shift motor locks the 2 sides of the axle together?

In this theory then, I am actually engaging one front wheel?
Yeah you are correct in you're think the lever is putting the axle into 4wd but the front right (passenger front) will always free spin as long as the vac lines are broken. One quick fix is get a good used one piece passenger tj shaft and replace it then that would eliminate the need for the vaccum lines
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OHHHH BOOOO!!!!!!!!
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Old 07-31-2011, 10:24 PM   #4
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Location: Monterey, CA
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Thank you both! That's a big help.

One thing I have not located yet (haven't looked) is the source vacuum line, red, which as I understand should be around the carburetor.

I see that harness kits are available; it's hard to tell from the picture if they're color coded. I'd like to keep them the same if I go that route, as it's made troubleshooting this a lot easier.

I've also read up a little on the Posi-Lok, just a cable that runs from cab to axle.

Billy, you are describing something different. I'd have to see what one looks like.
Will that work on my YJ?
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Old 08-24-2011, 01:19 PM   #5
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I found my red line coming from the transfer case and out under the battery box. On the 2.5L it connects to the bottom line of the vacuum 4 port connector at the rear passenger side of the engine. I bought a new harness from Jeep just to stop the PO vacuum cut and plug chasing.
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