Question about Chevrolet Suburban 2500

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4L80E trans. Lost passing gear/overdrive suddenly

1991 Chevy Suburban 454 w/ 4L80E trans. Lost passing gear/overdrive suddenly. What could the various causes be?

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Bad transmission, that's not a good answer. Bring it to the shop [so we can guess around], not a good answer either.

A good mecahanic will respond with something about the solenoids.

I have repaired the 4L80E on my tow truck, I have to do that almost every year, the last time it ran perfectly but when I push the pedal to the metal, it shifted from 3rd gear to 2nd and stays on 2nd gear until I turn the ignition off and start again.

The transmission was totally rebuilded so the answer "Time to rebuilt the transmission" is not acceptable.

I took it back to the shop and the mechanic replaced both solenoids A and B, that was the only thing that hasnt been replaced before, it was just a guess but works

So, I am not a mechanic but my sugestion is to replace the two speed sensors and solenoids before you take the tranny out of the car and be carefull who are you taking the transmission to because guessing is not always the best course of action

The two speed sensors are easy to replace, the solenoids are inside of the valve body but you may be able to replace them without removing the transmission from the truck

Posted on Jan 13, 2010

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1997 MH 454 vortec 4L80E trans. Coming up hill an lost first ,got it movin an got to gas station an no rev. Once moving 2nd an up are working,just no 1st or Rev. Any help,,Thank you.

Posted on Jul 08, 2014

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Unfortunately,the transmission is probably bad.

Posted on Jul 15, 2009

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