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Old 08-09-2016, 06:02 PM   #1
18Z
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TH350 Modulator Vacuum line for 4x4 pictures

Anyone have a picture of the modulator vacuum line for a TH350 in a 4x4? I bought one from www.inlinetube.com and they say it's for my 71 GMC K15 4x4 but it doesn't look anything like what I have on it now.

Thanks for the help
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Old 08-10-2016, 06:18 PM   #2
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Is this a correct TH350 Transmission modulator vacuum line for a 4x4?

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Old 08-10-2016, 06:41 PM   #3
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Re: TH350 Modulator Vacuum line for 4x4 pictures

doesn't look correct to me
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Old 08-10-2016, 09:02 PM   #4
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Re: TH350 Modulator Vacuum line for 4x4 pictures

I think it should have 180 degree turns at both ends. I have one at work
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Old 08-11-2016, 05:39 PM   #5
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Anybody have a picture of how the right one for 4x4's looks like?
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Old 08-12-2016, 07:35 PM   #6
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Here one I have loose. Will try to compare w one on a k5 this weekend to confirm it matches. Did 4wds use a different line for sure? I can't recall.
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Old 08-13-2016, 12:42 AM   #7
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Re: TH350 Modulator Vacuum line for 4x4 pictures

It should be the same line 2wd and 4wd
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Old 08-13-2016, 11:10 AM   #8
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Re: TH350 Modulator Vacuum line for 4x4 pictures

When I looked around for one, the sites always had 2wd on the listing or both 2wd and 4wd to order, www.inlinrtube.com has both 2wd and 4wd so I ordered the 4wd and it doesn't look like the one I have on my 4wd truck but doesn't look like it would work right either. The one I have on there now gets in the way of my transfer case shifter which is why I thught the PO might of put the wrong one on.

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Old 08-13-2016, 11:36 AM   #9
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Others have had fitment issues w inline tube products so it wouldn't surprise me if it wasn't 100% correct. Does the 2wd part # differ?
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Old 08-13-2016, 04:09 PM   #10
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Yes the part#'s are different.
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Old 08-14-2016, 09:28 PM   #11
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Surely someone on here has a picture of a 4x4 TH350 transmission modulator vacuum line!
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Old 08-14-2016, 10:46 PM   #12
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Here is a pic of the one I pulled out of my 72 K20, might have a few extra bends in it as I just yanked it out and wasnt all gentle like.
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Old 08-14-2016, 10:59 PM   #13
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Thanks RedRoad, that looks more like it should look to me, I will send this photo to inlinetube and see what they say.

Thanks again
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Old 08-15-2016, 04:27 PM   #14
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Here is mine out of my '72. Looks a little different that the others in the thread but I'm pretty sure it's original to the truck.
edit to add there use to be a clip holding the modulator line to the dipstick but it's likely under the table.
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Old 08-19-2016, 11:17 PM   #15
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Re: TH350 Modulator Vacuum line for 4x4 pictures

Thanks Everyone, I hooked up the one I got from inline tube and it works but I think I will make my own to make it a bit more streamline.
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