vaccum switch

[87xjpioneer757]

So do I really need this vaccum switch on the transfer case? I'm planning on making a cable disconnect for the front axle. Can't I just cap the vaccum hoses at the end of the metal lines? If I do, the idle will go up, is there a way I can set the idle? I have an 87 xj with a 231tcase and a 4.0 auto.

[Eagle]

If you remove the axle disconnect or make it manual, you can cap the lines from the t-case. The 4x4 light in the instrument cluster will no longer work.

This should not affect idle speed.

[87xjpioneer757]

Thanks. The plunger in my vaccum switch was stuck, causing the tcase not to shift, so I ground the round end off, making it flat. It shifts now. I'm trying to eliminate all things that can go wrong when I need them to work, so of course I'm taking everything vaccum out of the picture that I can. Will it hurt anything if I leave the ground down vaccum switch in? I don't see where it can hurt. Does the bicycle brake cable disconnect really work as good as it sounds?

[XJEEPER]

T-case switch should be fine the way it is. For a more solid disco cable setup, I recommend using a HD push/pull cable instead of the bike brake cable, following the same process. My low-buck Posilock setup works great ($45.00 total), is strong and durable......and cheap 2Low is an added bonus!

[87xjpioneer757]

think a universal manual choke cable from advance would work? I have some cable clamps from the heat exchangers on old VWs that would work to hold the end of the cable.

[Overdriven]

I've been using a quality bicycle brake cable for about 6 months now and it still works great. No problems. yet. Definatelly a great mod. I'm like you. I'm trying to cut as much vacuum stuff out as I can.

[XJEEPER]

I found that the push/pull cable from 6 States is nearly indentical to the Posilock cable and only cost about $30.....and it won't stretch like a bike cable will, but I tend to over-engineer for durability cause I hate doing the same job twice.

[Overdriven]

Had I know that was available I probably would have gone with it instead. I agree with you. Do it once, right!

I didn't have 4wd at all when I did this mod and I was in a hurry. MacGyvered it just to go wheelin that weekend. Still holding up though.

[87xjpioneer757]

Thanks. I found a vaccum diagram to use and will be eliminating all unnecessary sources of vaccum and capping them, then using a cable locking system.