Question about 1985 Oldsmobile 98

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Auto Transmission does not shift into overdrive. Fluid, filter and gasket has been changed. Could it be the vacuum modulator? 3.8 V6

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It is not the vacuum modulator, it might be the vehicle speed (VSS) sensor, this is where the powertrain control module get it's signal to shift into overdrive.

Posted on Dec 19, 2008

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If the transmission is not shifting, could it be the vaccum modulator?


when was the last time the tranny had a new filter put in with new fluid? if the vacuum module was bad, it would suck all the tranny fluid out of the tranny and into the engine from vacuum and you would be smoking out the tail pipe..

Apr 28, 2015 | Cars & Trucks

1 Answer

87 sedan deville soft slow shifting


You sure the modulator on top of trans is good
or has vacuum?

After several years of use the valve body get dirty
& they only go 7 to 10 years
Got nothing at all to do with mileage

Is the exhaust converter blocked or gas filter clogged

Mar 08, 2013 | Cars & Trucks

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Transmission hesitates shifting to second and keeps downshifting from overdrive too quickly


Check the vacuum modulator and the hose going to it. Also check for vacuum leaks on or around the engine. Have you checked the fluid level or changed the fluid in the transmission? How about the throttle position sensor? (if it has one).

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1996 Ford Taurus Won't Shift


Your transmission is toast. Smell the fluid on your ****** dipstick. It will smell really burnt.

Feb 04, 2012 | 1996 Ford Taurus

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Check the fluid level of the transmission. Also if you haven't done so in the last 30k miles change the transmission filter/fluid and pan gasket.

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My at transmission does not shift through its gears or downshift when manually downshifting.fluid level on dip stick is good.


when you checked the fluid level was the engine running? to check auto fluid in gearbox the engine has to be running to be correct

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1 Answer

1994 dodge caravan 3.3l v6 auto/od.


it sounds like the transmission is in limp mode this happen when the transmission modules finds a problem in the transmission. If you drive to long like this the oil heats and more damage is done

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check the kickdown/throttle valve cable. It may be bound up and stuck in the maximum position giving you extremely late shifts.

There ISN"T any modulators or vac lines on any Chrysler automatics

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