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Old 12-22-2025, 10:04 AM   #1
65chevysub
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TH400 vacuum line connection

I just got my 84 Sierra back from getting another engine, and when driving it home it wouldn't shift. I looked and noticed the vacuum line wasn't on the modulator, but can't find or remember where I had it hooked. Can someone please show me where to connect it on the engine? I have a 350 with an Edelbrock carb. Thanks
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Old 12-22-2025, 10:38 AM   #2
Getter-Done
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Re: TH400 vacuum line connection

Mine is run to this tee behind the Carburetor.

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Old 12-22-2025, 01:02 PM   #3
Dead Parrot
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Re: TH400 vacuum line connection

2nd what Getter-Done said for the normal spot. But any manifold vacuum source should work if the manifold isn't near standard.
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Old 12-23-2025, 09:24 AM   #4
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Re: TH400 vacuum line connection

Thanks guys. I appreciate the info and pic. Merry Christmas
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Old 01-13-2026, 12:04 PM   #5
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Re: TH400 vacuum line connection

I got it fixed. Accidentally left it at the shop where the engine was put in. The T was in the intake as well. I did a fluid and filter change and she shifts smooth as glass.
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