transmission pressure

[|PuNiSh3R|]

This isn't exactly hardcore super tech veteran info.. but I needed a fast answer

If I do believe correct, when the car is started on an automatic transmission vehicle, there is ALWAYS pressure on the fluid, right?

So if I started my car and I measured the pressure at the tranny cooler I've installed.. what would it be? I guess it gains pressure as the rpm's increase, right?

Reason I ask is because I need to install this oil pressure switch somewhere and on the block isn't an option.. it's a pressure switch for a GM vehicle.. so it has the leads on it that I need to connect the wiring for my electric fuel pump... I did a mechanical to electronic pump conversion on my 4af engine and now I need a way to turn the pump on when the engine is running and off when the engine stops.. so I figured that the tranny might be a good place because it would be easy to tap into since I have a tranny cooler on it already..

[alltrac165]

I'm not sure of the operating pressure in the tranny, but it might not reach a pressure high enough to trigger the switch when you are cranking the engine. I think you're going to have to use engine oil pressure as that can reach a decent pressure under cranking in order to start the fuel pump. Just a guess, though, don't know for sure.

[csaxon]

With transmission in D position and fluid at 122-176 degrees F
A140E idle 53-61psi Driving 107-125psi Reverse 90-115psi
A541A 58-66psi 165-179psi 117-128psi

Both transmissions have test plugs on lower front sides that could be adapted.