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?

 

a checkvalve would work fine and cheap!

 

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.

 

Transgo makes a little blow off valve to keep boost from getting to the trans.

 

I kinda thought it would need a way to bleed off

 

P/N for this? Is it used in conjuction with Check valve?

 

VBP-VAC

It is the check valve / blow off valve, whatever you want to call it.

 

Here are some links.

One More,.

 

Thanks all!