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- - TH400 vacuum line connection (https://67-72chevytrucks.com/vboard/showthread.php?t=862105)

65chevysub

12-22-2025 10:04 AM

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

Getter-Done

12-22-2025 10:38 AM

Re: TH400 vacuum line connection

1 Attachment(s)

Mine is run to this tee behind the Carburetor.

Attachment 2438653

Dead Parrot

12-22-2025 01:02 PM

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.

65chevysub

12-23-2025 09:24 AM

Re: TH400 vacuum line connection

Thanks guys. I appreciate the info and pic. Merry Christmas

65chevysub

01-13-2026 12:04 PM

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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