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Old January 24th, 2011, 07:24 PM   #1
xploder25
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Default 1996 Dodge 1500 has no vacuum (no 4wd)

I try to put it into 4wd and nothing happens, no 4wd light. The transfer case is working fine because it will go into low range and the front driveshaft wont spin freely by hand in 4wd. I replaced the vaccum shift motor (4wd actuator) on the axle and its moving 1/2" like it should be but not getting any vacuum pressure to the actuator. I followed the lines to the vacuum switch on the transfer case and theres no visible leaks. Then i took the vacuum switch off and it seems to be moving up and down freely like it should. I dont think I'm getting vacuum pressure to my vacuum switch. Any ideas what it could be?
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Old January 24th, 2011, 07:34 PM   #2
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do you have good vacuum going down to the t case.
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Old January 24th, 2011, 07:52 PM   #3
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i dont think so, i can't test it because it was hard enough to get the vacuum switch off. I did lose vacuum to the vacuum resivour under the wiper cowl though. but i don't have a check engine light on for low or no vacuum?
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Old January 24th, 2011, 08:22 PM   #4
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Check all the lines to make sure there are no leaks or restrictions. With the age of the truck I wouldn't be surprised if one of the steal lines has a pin hole in it. If you want a more permanent fix get a posi-lock set up or lock the axle in permanently so you don't have to mess with it.
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Old January 24th, 2011, 09:32 PM   #5
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Yeah i would go that route but i just spend $100 on a 4wd actuator so i just want to get it to work for now.
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Old January 25th, 2011, 05:51 PM   #6
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any ideas? I can't find any leaks in the vacuum lines
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Old February 27th, 2011, 05:11 PM   #7
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i have the same shit with my 2000 dodge ram no 4x4
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Old March 3rd, 2011, 09:41 PM   #8
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Mine had no vacuum, steel lines had rust holes. So I replaced those, still didn't work. I removed the actuator and it was stuck from not being used for so long.

I put some air tool oil inside the port ans swirled it around to try to lube it up inside. Then I put a vacuum pump on it, pulled a hard vacuum, and pushed the fork over, and it went. Then put the vacuum on the other port, and moved it that way. Back and forth many times until it was moving freely. Worked fine ever since.


Its not that much to it. Follow the line all the way back to the engine. Somewhere along the line, its got to have vacuum somewhere.
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