4X4 Vacuum Switch Motor - '98 Ram 1500 - "PLEASE HELP" - DodgeForum.com


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4X4 Vacuum Switch Motor - '98 Ram 1500 - "PLEASE HELP"

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Old 10-16-2007, 02:35 PM
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Default 4X4 Vacuum Switch Motor - '98 Ram 1500 - "PLEASE HELP"

My 4X4 vacuum switch motor is bad so I can't engage/disengage my front axle for my 4wd. I can't seem to find a good used one and new ones are ungodly in price. Does someone have an illustration on how to modify this over to a cable type system. I don't want to spend the $150 for an actual "posi-lock" either, and I know many have have used choke/throttle/bike brake cables/etc to make the same system cheaply. If you know how to do this and have the instructions/illustrations on how to do this, PLEASE share with me. I have the housing off right now so truck is parked, and I really need to get it back on the road ASAP.

Thanks in advance!!
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Old 10-16-2007, 03:57 PM
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Default RE: 4X4 Vacuum Switch Motor - '98 Ram 1500 - "PLEASE HELP"

Judging by this diagram, I would have to say that this "motor" is nothing more then a diaphram. I'm sure that if you don't want to spend $$$ to fix it properly, you could dissademble it and make some sort of cable attachment to actuate the shift fork. Actually, now that I've looked at this picture, I may just knock mine off and design my own POSI-LOCK as it doesn't seem to be anything special.

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Old 10-16-2007, 09:49 PM
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Default RE: 4X4 Vacuum Switch Motor - '98 Ram 1500 - "PLEASE HELP"

if you'll make sure there is vacuum, take it apart and clean the shaft up, it will probably fix it.
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Old 10-16-2007, 11:18 PM
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Default RE: 4X4 Vacuum Switch Motor - '98 Ram 1500 - "PLEASE HELP"

I did take it apart and sprayed the hell out of it with WD-40. It did clean out the rust from moisture it had in it, but is still a little sticky. I did hook the vacuum back up to it while I had the wife shifting the transfer back and forth and it would still catch about 1/2 the time and wouldn't push it far enough to push the 4X4 light switch on. So I figured the easiest fix would be to modify it to a posi-lock. I would love to keep it original, but I'm not going to pay $150 for a used one or $250 for a new one. My gosh, it's just a vacuum deal.
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Old 10-17-2007, 12:44 AM
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Default RE: 4X4 Vacuum Switch Motor - '98 Ram 1500 - "PLEASE HELP"

Did you check the local junk yard? The CAD unit is pretty common on Dodge and Jeep 4WD products. I p/u a used CAD off a '93 Jeep Wrangler in my local pick and pull for $15.00. I swapped out the shifter fork off the old one but other than that the unit fit just fine on my '95 Ram 2500. I riggged up a vacuum solenoid with a switch inside the cab so I can control the front axle if I want to use low range in 2WD.
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Old 10-17-2007, 07:22 AM
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Default RE: 4X4 Vacuum Switch Motor - '98 Ram 1500 - "PLEASE HELP"

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Old 10-19-2007, 03:29 PM
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Default RE: 4X4 Vacuum Switch Motor - '98 Ram 1500 - "PLEASE HELP"

I just ran across this site and remembered this post. I hope this helps. http://www.strippermotorsports.com/4x4pofraxacp.html
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