gmrulz4u Posted October 24, 2002 Report Share Posted October 24, 2002 Anyone ever replace their VACUUM MODULATOR? And if so, what problems were you experiencing before-hand? And how much of a difference did it make, or did you notice, once the new one was installed? THANKS:o) Quote Link to comment Share on other sites More sharing options...
bumping z34 Posted October 24, 2002 Report Share Posted October 24, 2002 i have replaced it on my 90 lumina i was experincing harsh shifts i mean like slam into 2nd after i put it in the shift smoothed out but i do know the trans is damaged due to when the trans line broke on me in the mountians and i had to drive it with trans oil flowing out like asiv went through a gallon of oil in 20 mins! Quote Link to comment Share on other sites More sharing options...
Justin Posted October 24, 2002 Report Share Posted October 24, 2002 You can get adjustable modulators, there's a little screw you turn inside it to adjust how firm it shifts. I don't know if they work for the newer cars, I'm sure they would, I have on in my TH350 in my Ventura. One way to know if you have a bad modulator is tranny fluid in your air cleaner or out the exhaust. If the diaphragm tears, the vacuum line can suck tranny fluid into the engine. Quote Link to comment Share on other sites More sharing options...
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