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4l80e shift problems Tom 11-24-08  
No issues at all until Monday after 1992 Chevy G30 van sat for a week. It would not shift into 3-4 and reverse would only work if I turn van off and back on.
I disconnected ecu to tranny and it seemed to shift better. Not sure If I should replace expensive ecu. Not sure if I should replace valve plate and solonoids.
I checked all wires visibly and cleaned and greased connectors from ECU to tranny.
I know there are speed sensors but not sure if I should replace those either.
I checked ign fuse and connects seem ok.
Re: 4l80e shift problems justin 11-27-08  
The problem with my suburban turned out to be low voltage to the transmission computer putting it in "limp mode" it would only operate in 2nd and reverse. i never did figure out the problem on my own i took it to a transmission shop and they told me it was caused by a bad alternator, i replaced te alternator and the problem persisted. then i took it to a diagnostic center and it ended up being a bad ignition switch. i replaced it and havent had a problem since. the diagnostic fee was $50 definatly worth it, i cant imagine how many parts i would have thrown at it.
Re: 4l80e shift problems big body 11-30-08  
My trans fuse keeps blowing..at the same time it started this..the speedometer and rpm and indicator light..all quit.... but it will pop the fuse as soon as you turn the key on...ive changed the column..and the manual lever position sensor on the side of the trans...what else could it be..
Re: 4l80e shift problems aliliwe 12-10-08  
Please send me the cataloque of 4L80E systems
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