More Info, If You Do Not Find A Modulator, You Could Have a Different Trans. If You Have A Square Pan With 16 Bolts Then You Have A 4L60 or TH700( no modulator on these) If the pan is oval and 17 Bolts Has 4L80 ( no modulator on these) Hope This Helps You Should Have A TH400 Trans & It Does Have A Modulator.
If your transmission has a modulator it is on the side of the trans and it has a nipple on it for the vaccum line. I you. Mark
On the back of the trans. There should be a vacuum line running to it.
There is a modulator on some transmissions. If yours has a vacuum line going to the trans, it connects to the modulator and you simply remove the bolt holding it and pull it out.
on the passenger side just above the trans filter pan
the vacuum modulator can be bad. With the engine OFF, remove the vacuum line at the modulator. If fluid runs out, there's your problem.
the modulator valve does not have a screw, however, the modulator located outside the modulator valve may or may not have one.
i would check the vacuum hose that goes to the vacuum modulator on the transmission the vacuum modulator probably has a hole in it and the fluid is going into the engine and being burned or check your coolant the radiator may have a hole in the transmission cooler inside the radiator so check your coolant and the vacuum hose for trans fluid good luck
When you get ready to run the vacuum line from the turbo 400 trans modulator to an Edlebrock Performer 800 CFM carb, attach the vacuum line for the transmission vacuum modulator to the bottom constant vacuum source or the plug that is below the throttle plate. After that, install the vacuum advance to the port that is signaled or right above the throttle plate. Once that is completed, install the large vacuum line to the back of the carb for the power brake.
sounds like a vacuum leak going to the modulator on the trans. check for what souns like a air leak on the small tubes going to the trans
Dodge transmissions do not use vacuum modulators.Dodge transmissions do not use vacuum modulators.