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vacuum lines for 4x4

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  #1  
Old 11-03-2010, 05:17 PM
bobracing32
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Default vacuum lines for 4x4

My 4x4 wont engage. the red and black lines which lead to the tcase are fine and the two green and white wires which run up behind the distributor are just hanging there. Where do the green and white wire go to?
 
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Old 11-03-2010, 07:28 PM
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One is vacuum supply, the other is just a vent hose. (I don't recall which is which.) Having no vacuum supply would certainly explain why your front axle doesn't engage.
 
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Old 11-03-2010, 10:55 PM
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i have the same prob. mine wont engage, it used to perfectly, then it would take 5 mins... then 10 mins.. and now nothing so i think the motor might of went out on mine i dunno.
 
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Old 11-03-2010, 11:03 PM
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here... http://dodgeram.org/tech/repair/4X4/4x4_engagment.htm

common problems include vac leaks, sticky/rusty diaphragm shaft, worn bushings causing misalignment, and burrs on the splines making the collar too tight.

the fixes are mostly simple. you can fix it annually or replace the whole pile of **** with a posilok.
 
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Old 11-03-2010, 11:46 PM
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green is fine but the white line is the vac supply line, if its "hanging" your getting no vac to the cad.

supply the cad with vac and well go from there; that likely will solve the problem though
 
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Old 11-03-2010, 11:51 PM
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Originally Posted by ryan0714 View Post
i have the same prob. mine wont engage, it used to perfectly, then it would take 5 mins... then 10 mins.. and now nothing so i think the motor might of went out on mine i dunno.
could be a steadily deteorating vac line. verify that you have around 17" vac at the cad.

i believe the red line should have vac in 2wd and the black should have vac in 4wd. (or vice versa).

thats the most likely cause but could be a bad shift collar or jacked up axle shaft splines as well as the shift motor. my ram has 170k on it and all those components are in great condition
 
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Old 04-27-2015, 08:31 PM
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I have a 2000 dodge ram 1500 4*4, I have replaced the actuator, and the 4*4 still doesn't work, and I have also noticed that the a/c vents acts funny as well like they open and closes... where in the vac lines should I look to find the problem, and does the two problems have a common vac point that I need to look at???
 
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Old 04-28-2015, 12:21 AM
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Originally Posted by dodgemike13 View Post
I have a 2000 dodge ram 1500 4*4, I have replaced the actuator, and the 4*4 still doesn't work, and I have also noticed that the a/c vents acts funny as well like they open and closes...
Do a search of this forum for "wild vents" and you'll find everything you need to know, and then some.
 
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Old 04-28-2015, 07:00 PM
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I put a perm-lok on mine to make it foolproof. Now it's always ready to go into 4WD as the collar is permanently slid over.

http://4x4posi-lok.com/app_dodge.html
 

Last edited by armynurse; 04-28-2015 at 09:05 PM.
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