Replace the modulator. It is usually a cheap, "screw-in" part that can save your entire transmission from burning out due to low fluid.
Because the vacuum signal is lost, the transmission doesn't know when to shift. You’ll experience "late" or "hard" shifts that feel like the car is slamming into gear. tranny suck hardcore
As the engine burns the ingested transmission fluid, a thick, acrid cloud of white/grey smoke pours out of the exhaust. Replace the modulator
When a transmission starts sucking fluid into the engine, the symptoms are immediate and hard to ignore: tranny suck hardcore
If you suspect your transmission is "sucking hardcore," the diagnosis is simple and requires no special tools: