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th350 in boosted car

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Old Dec 21, 2008 | 11:44 AM
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Default th350 in boosted car

I'm going to a th350 in my boosted car, what do you do for the Vac Modulator to keep boost out is it as simple as a check vlv or not?
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Old Dec 21, 2008 | 06:08 PM
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a checkvalve would work fine and cheap!
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Old Dec 21, 2008 | 06:51 PM
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I believe a check valve could lead to transmission failure.

A check valve will allow vacuum to pull the modulator in (low line pressure), but since it allows vacuum to travel one way it might never release it. So the modulator is either going to release very slow or not at all, it's going to stay stuck at low line pressure.

I go with a cable actuated modulator.

Last edited by 9000th01ss; Dec 21, 2008 at 06:59 PM.
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Old Dec 21, 2008 | 08:38 PM
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Transgo makes a little blow off valve to keep boost from getting to the trans.
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Old Dec 21, 2008 | 09:39 PM
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Originally Posted by 9000th01ss
I believe a check valve could lead to transmission failure.

A check valve will allow vacuum to pull the modulator in (low line pressure), but since it allows vacuum to travel one way it might never release it. So the modulator is either going to release very slow or not at all, it's going to stay stuck at low line pressure.

I go with a cable actuated modulator.
I kinda thought it would need a way to bleed off
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Old Dec 21, 2008 | 09:53 PM
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Originally Posted by calongo_SS
Transgo makes a little blow off valve to keep boost from getting to the trans.
P/N for this? Is it used in conjuction with Check valve?
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Old Dec 21, 2008 | 10:36 PM
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VBP-VAC

It is the check valve / blow off valve, whatever you want to call it.
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Old Dec 21, 2008 | 11:55 PM
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Here are some links.

One More,.
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Old Dec 29, 2008 | 03:58 PM
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Thanks all!
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