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Old 04-12-2005, 12:06 PM   #21
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The THM440T4( 4T60 ) do have a vacume modulator... But the shifts of detent should be controled by the TV cable... The Modulator has more to do with shift quality... On my 91 with the modulator dissconnected the car has some neck snapping shifts... Not as bad on the 95 when I dissconnect the Modulator...

Justin if you have no first gear except when you manually put it in first gear than I'd say some is sticking or wrong with your valve body...

The 4T60-E also uses the Modulator for shift quality, dissconnet it( I don't reccomend that ) and you get some major klunky shifts...

Good Luck

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Old 04-12-2005, 04:51 PM   #22
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I don't think there is anything sticking.. I really think it has to do with the vacuum modulator. We'll see once I get that all situated what happens.

If I unplug my modulator all it does is make the tranny slip a LOT.. like the car won't move hardly at all until 2.5k RPM. You replace your modulator by any chance? Could be mine is dead..


-justin
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Old 04-12-2005, 06:16 PM   #23
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Quote:
Originally Posted by opensourceguy
I don't think there is anything sticking.. I really think it has to do with the vacuum modulator. We'll see once I get that all situated what happens.

If I unplug my modulator all it does is make the tranny slip a LOT.. like the car won't move hardly at all until 2.5k RPM. You replace your modulator by any chance? Could be mine is dead..


-justin
Never had any trouble with the 91'* modulator...

The 95, well thats another story... I had some hell bent shifts at times, couldn't figure it out, untill I discovered Trans fluid making its way to the throttle body vacume ports.... I removed the Modulator and turned it over to have trans fluid pour out of the vacume port...LMAO.... I replaced it with a factory unit... $120

Also when I unplugged mine it didn't slip at all... just shifted really hard

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