Vacum modulator
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Joined: Dec 2001
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From: webster ny
Car: 1987 IROC-Z
Engine: Carbed 355
Transmission: TH-350
Vacum modulator
I am currently in the middle of swapping in a th 350 i pretty much know enerything i need to except the vacum modulator. it controls the shift points but how do i adjust it and what do i need special to get it to work right. sorry if i sounds stupid but i am pretty illiterate when it comes to transmissions. thanks soo much guys
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Joined: Jan 2000
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
I don't think the stock ones are adjustable. It'll have to be connected to manifold vacuum.
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Joined: Jun 2001
Posts: 3,238
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From: Calgary, Alberta, Republic of Western Canada
Car: 1986 Sport Coupé
Engine: 305-4v
Transmission: 700R4 and TransGo2
Chris,
Send me your email. The Shaw one doesn't seem to be eliciting a response. Are you still using it?
Send me your email. The Shaw one doesn't seem to be eliciting a response. Are you still using it?
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Joined: Jul 1999
Posts: 18,457
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
Get yourself one of the ones with a red stripe. Not a pink stripe, not a green stripe, not the big funky black can; get a red stripe one. There is no "almsot as good", get the right thing.
It connects to a source of continuous manifold vacuum, like the feed to the cruise control from the manifold.
There is a little screw down inside the fitting where the vacuum line plugs on. Screwing it CW raises the shift points. 2 turns would make a massive adjustment; ½ turn increments are usually enough.
It connects to a source of continuous manifold vacuum, like the feed to the cruise control from the manifold.
There is a little screw down inside the fitting where the vacuum line plugs on. Screwing it CW raises the shift points. 2 turns would make a massive adjustment; ½ turn increments are usually enough.
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