2nd Gen Non-Engine/Transmission 4 whl drive issue, vacuum switch

[moparguy]

I've been working on little Bro's clapped out ranch truck and am currently fighting the 4whl drive. When he bought it some of the vacuum lines were disconnected and I felt sure that was the reason the front would not engage.



Well after hooking everything up (his is a 95 like mine) using mine as a guide, and then clearing the stopped up lines, still no vacuum to the axel. I've got vacuum to the vacuum switch on the transfer case, but only to the one port that is direct form the vacuum pump. I've pulled the switch and made sure all 4 ports are clear, still nothing.



So, has anyone ever heard of one of these going bad?



I'd pull mine but the frame mounted air tank makes access to mine a fairly big job what with the R&R of the tank and all, I can do it, would just take a while.



Thanks, RJR

 

[vssman]

Yes they can go bad. Moisture can collect in it and freeze. I picked up one from the Dodge dealer for about $13. 00 say maybe a year ago. Oil in the vacuum lines can also cause all sorts of problems.

 

[moparguy]

Vssman, well it seems that the problem is the rubber plug that plugs onto the switch. I'll contact the local dealer and see if it's available. Over the years it's been oil covered and swelled to the point that it will not seal with the male outlets on the vacuum switch.



RJR

 

[wcjp]

My fix is here.