Author Topic: Transfer Case Vacuum Switch  (Read 1105 times)

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Offline dgabajay

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Transfer Case Vacuum Switch
« on: November 4, 2010, 04:44:22 PM »
So, I took my truck into the shop to get the vacuum lines to the CAD unit replaced. The truck now will only shift into either 4 or 2. Will not switch between them without switching the vacuum lines back and forth. Which lead us to believe the Transfer Case Vacuum Switch is bad (part #730-1637 I believe). Problem being, they said that part isn't made anymore. Any idea as to where I could get one, anyone have an extra laying around?
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Online KThaxton

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Re: Transfer Case Vacuum Switch
« Reply #1 on: November 4, 2010, 04:55:06 PM »
I bought one from a dealer just about 3-4 years ago.

I think I've heard people say that one you can get in the Help aisle at any parts store that is labeled for Jeeps will work.
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Re: Transfer Case Vacuum Switch
« Reply #2 on: November 4, 2010, 05:02:52 PM »
yup the jeep one works

and boy did they screw your truck up / they have it hooked up wrong / the engine vacuum is hooked to the bleed off vacuum port / thats why you gotta switch them
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Offline moparmike72

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Re: Transfer Case Vacuum Switch
« Reply #3 on: November 4, 2010, 05:25:32 PM »
I've got one here, you can have it for postage, pm Me about it if you want it.
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Offline dgabajay

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Re: Transfer Case Vacuum Switch
« Reply #4 on: November 5, 2010, 12:22:35 PM »
Well I definitely learned my lesson for a life time,

Never, ever take your vehicle into the shop if you can fix it yourself. They only seem to break more shit than they fix. I took my truck in there, twice now. The four wheel drive obviously isn't fixed (as previously mentioned), they broke my CB whip and didn't even have the audacity to tell me (oh, and there fix, electrical tape), my heat no longer works and the truck is running hotter. How does that even happen. I'm definitely going to write them a bill about the whip.
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Offline Chump

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Re: Transfer Case Vacuum Switch
« Reply #5 on: November 6, 2010, 04:22:21 AM »
Part# 730-1637 is a NAPA part number and should still be available. Dorman Products makes this switch also and is used on some Jeeps. Get back to me if you still need help. :)
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Offline dgabajay

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Re: Transfer Case Vacuum Switch
« Reply #6 on: November 16, 2010, 09:50:45 AM »
The part just came in yesterday. Thanks moparmike.

What would be the best way of getting at this. If I'm not mistaken, it's at the top of the transfer case, and the body is kinda in the way. I haven't looked at it yet, just from what I've heard.
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Re: Transfer Case Vacuum Switch
« Reply #7 on: November 16, 2010, 10:05:43 AM »
You do it when your t-case is out for a rebuild, like I did.  ;D

Sorry, I haven't attempted it while the case is mounted. It looks like it would save a lot of cussing if you just lowered the case a bit, but I seem to recall others doing it in place.  {noclue}
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Offline dgabajay

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Re: Transfer Case Vacuum Switch
« Reply #8 on: November 16, 2010, 11:16:38 AM »
I'm going to be taking it into the shop to have it done. A different one then the previous one mentioned, mainly due to us already having a few inches of snow on the ground that I quite frankly don't want to be tinkerin around in. Just wondering if it would be a pricey job.
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Re: Transfer Case Vacuum Switch
« Reply #9 on: November 16, 2010, 11:54:07 AM »
Mamby pamby, I worked on a snow covered driveway for 13 years before I finally built a garage.
Soon, you'll learn not to trust shops for every little thing.  ;)
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Offline dgabajay

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Re: Transfer Case Vacuum Switch
« Reply #10 on: November 16, 2010, 10:14:49 PM »
Well, I'm also away at school and the tools I would need to drop the transfer case or even do any project larger than changing the tires are around 600 miles south.
1987 RC 318 A727 NP208 3.21 gear ratio