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Old 08-29-2010, 01:28 AM   #1
Junior Member
Join Date: Aug 2010
Location: England
Posts: 10
4L80E o/d problem

Do we have any transmission experts on here???? My 2001 Gulfstream has a really annoying problem, as soon as the motor etc are warmed up and you are cruising on the highway, if you come to a hill in o/d and the trans kicks down a gear it will not change back into o/d from 3rd until the ignition is switched off. A fault code comes up as slipping clutch problem but having changed the fluid and filter as well as the pressure switch there is no sign of burnt fluid so I do not think this is the case.

If I manually change the box down sometimes it will change back into o/d. I have been told these transmissions suffer from the wiring looms playing up internally but to me it is as if something needs adjusting to allow more pressure so the converter stays locked that bit more, is it possible to fit a converter lock up switch at all???

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Old 08-29-2010, 09:13 AM   #2
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Workhorse Chassis Owner
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Location: st.charles mo.
Posts: 1,138
Drive shaft speed sensor.

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Old 09-02-2010, 03:53 PM   #3
Join Date: Aug 2009
Posts: 35
Originally Posted by speed racer View Post
Drive shaft speed sensor.
or input speed sensor... Or the converter is locking/unlocking when it shouldn't be.

What is the actual code?

The trans has two speed sensors, input and output. Output controls your shifts and your speedo. Input just checks the difference between engine RPM, input speed after the torque converter and output speed after everything else inside the trans.
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Old 09-03-2010, 02:52 PM   #4
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Join Date: Aug 2010
Location: England
Posts: 10
Thanks guys, been to a couple of trans specialists and they think its something silly, they suggested the pressure regulator, but I am thinking of getting a full solenoid kit that includes the internal and external looms and the input sensors, Is it poss to manually lock the converter.
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