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Old 10-21-2009, 05:16 PM   #1
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89 wrangler question

ok so on the firewall to the right of the battery is a mounted module i am guessing with a wire grounded to the firewall and then wires going to the main wire harness and a vaccum line comming out the bottom. where does the vaccum line go and what is this little module i cant find it in my manual.

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Old 10-21-2009, 05:39 PM   #2
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I would need a picture of this module to make a determination but it could be either a relay or a map sensor.

The vacuum line goes to the front axle and transfer case. That little vacuum line is your only means of getting 4WD so look after it carefully or modify your front end. There are a couple ways to do that. The first is a product called Posi-Lock. It changes out the vacuum motor and lines for a cable that you pull in the cab. The second is what I did. Remove the vacuum motor off the front axle and remove the shift fork off the shaft and put a stiff spring in there to keep it engaged all the time. The 3rd option is to get a one piece axle shaft from a TJ and put it in place of your existing axle shaft.

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Old 10-21-2009, 05:44 PM   #3
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i have three vaccum lines going to the front axle 2 yellow and 1 green. i am putting the pics up next
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Old 10-21-2009, 08:20 PM   #4
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Not sure what year you have, but it sounds like this diagram may prove helpful to you.
Number one, is the big black plastic baseball under the battery. I'd bet number five is your module. Any one of the colored plastic vacuum lines can be rerouted with rubber vacuum lines from the nearest parts store.
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Old 10-21-2009, 08:40 PM   #5
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that might be how its suppose to be, but not how mine is. i will have to check that tomorrow thanks alot
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Old 10-21-2009, 08:55 PM   #6
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No problem, we prolly have even more answers to questions you haven't thought of yet!
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Old 10-21-2009, 08:56 PM   #7
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i used the spring mod on mine and it works great.
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Old 10-21-2009, 10:15 PM   #8
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Thats what the blue one is! My axle won't shift and I found the blue one with a screw capping it off. Hmmm coulsd this cause the issue? I havn't checked for a vacuum leak yet.
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Old 10-23-2009, 12:32 PM   #9
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so if i was to do the stiffer spring and keep it locked all the time will this hurt the front diff as i use this as a daily driver
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Old 10-23-2009, 12:53 PM   #10
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not really, the stuff that's there is all going around anyway. tj's have a solid front axle and they work ok. in essence all you are doing is "creating" a solid axle. it drives slightly different but not annoyingly so.
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TREAT EVERY STRESSFUL SITUATION AS A DOG WOULD.
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Old 10-23-2009, 01:41 PM   #11
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ok cool thanks chief, and i finally found what that switch is, its the command trac swtich vaccum operated. what kind of spring did you use on yours to make it a soild like axle

matt
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Old 10-23-2009, 02:15 PM   #12
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i went to ace and got one. about $1.25. just big enough to fit the shaft and about 1" long. i had to cut the one i put in till i got the correct length. they make one called a permiloc that does the same thing without and flex.i used a pretty stiff spring.

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TREAT EVERY STRESSFUL SITUATION AS A DOG WOULD.
IF YOU CAN'T EAT IT OR PLAY WITH IT,
JUST PEE ON IT AND WALK AWAY.
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