I swapped to a TH350 and wasn't sure as to where i should hook up the vacuum line coming off of it, and what that vacuum line even does? I now have a HSR installed and was wondering which vacuum port i should hook it to?? TIA

 

It needs to go to constant manifold vacuum. Any port that hooks straight to the plenum will work fine.

It tells the transmission exactly how much load is on the engine; far superior to a TV cable, which only tells the trans where the driver's foot is. Why they did away with a system that directly measures the quantity in question, and replaced it with one that sort of infers what it really needs to know on the basis of measuring something else, is a mystery to me.

 

Use a tee off the rear of the intake manifold where vaccuum is normally pulled. That's how an 83 L69/TH350-C application is setup.

 

So could i tee off of the line going to my fuel pressure regulator or even my MAP sensor? Thanks for answering my question. So if i don't connect it to anything, will that be bad for it?

 

Yes you can do that.

Yes leaving it open will be a bad thing. The transmission will think that your foot is absolutely through the floor at all times, and so it will never shift up. It must be hooked up. That's how it knows it's time to shift..... if the vehicle speed is high and the vacuum is also high (light load), then it knows it needs to grab the next gear. Conversely, if the vehicle speed is low and the vacuum is low (foot on the floor), it knows it needs to drop down a gear. The kickdown cable adds one additional layer of keeping it in lower gears.

 

It will shift without vacuum, but at the maximum speed as determined by the governor.

As for where to hook it up, personaly, I would not splice it with the MAP or FPR lines, as it seems like that would disrupt the signal. Hook it up as close to the manifold as you can.