It does not have one.
Lift hood. Locate area between engine and transmission, look down, follow the vacuum line from the maifold to just above the starter. The unit screwed into the side of the tranny with the vacuum line coming out is the modulator.
most likely the modulator on the tranny not shure of the spesifics on a 89 but its a cheap part (it will have a vacuum line going to both ends of it ) if you take the modulator out and there is fluid in there you need a new one if the diaphragm is torn you need a new one but for the hell of it since your gonna have it out you sould replace it anyway cause its a cheap part that will eventually need replacing
That transmission is electronic controlled. No need for a modulator valve.
The vacuum modulator on a 1989 Chevy K-1500 4wd 5.7 is underneath the transmission. It can be reached from under the car.
sure
That year model did not have a modulator valve on the transmission.
The 400 tranny on a 1983 Chevy 6.2L K20 diesel have very high pressure.
That year transmission did not use 1
ontop of the tranny
What is the engine in the Caprice? In the Suburban? If they are a 305/350 then they can be interchanged. I have a 1985 Caprice Classic with a 305 and the tranny came out of a 1987 Suburban. It depends on the engine.
i know theres a modulator on a chevy th 400 tranny that can leak fluid bad and prevent it from shifting.Its on the transmission itself.
try your vehicle speed sensor, connected to your tranny look underneeth kind of on the side of the tranny