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4L80E tranny problem shifting

I have a chevy c3500 with a 4L80E tranny. recently it started shifting funny. one day it wouldnt shift out of (i think 2nd) and my max speed was 35 without winding out tranny. drove it later that day and it wad fine. this happened about six other times and after turning truck off it corrected itself. now that isnt working and it wont shift. any suggestions anyone?

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I would replace transmition fluid first and maybe change filter in auto box , this is cheapest first option .

Posted on Mar 28, 2014

  • Richard Warren
    Richard Warren Jul 30, 2014

    I would check the vacuum going to the modulator,hoses and if you pull the hose off the modulator and fluid runs out ,repace it, chek hose at manifold is not blocked off and has plenty of vacuum.

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Swapped a 350 in 91 Chevy 3500.To a 305 motor.now tranny acting up.has 2nd 3rd. Changed fluid & filter.Now nothing.It want slip or anything.rebuild time? electronic ploblem? (shift solenoid)it's 4l80e


Sounds like electronic problem, if the tranny worked ok before the swap. Are you sure the converter is installed correctly? Also double check the shift linkage

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4L80E tranny wont shift


First, what's the mileage and what year? If this is a serviceable transmission and it doesn"t Have a bunch of miles sense the last service try a full fluid flush. Sounds like a dirty valve body and dirty servos. full flush may fix it. a full service shop should be able to do the flush. They will also do some preliminary tests to get a better diagnosis based on mileage and service history. If it's got 70-80k miles since last service, an o/haul may be needed. A full flush is not the typical drain and fill that most shops do as regular maintenance. Find a shop with a good reputation and good customer satisfaction. Late model transmissions are more complicated than the engine and have tighter tolerances.

Mar 27, 2014 | Vehicle Parts & Accessories

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1992 chevy 3500 wont shift unless under hard acceleration


there is a transmission sensor on the top of your motor by the intake. it senses the accelerator or motor rpm's and tells the ****** to shift. its about 30.00 and easy to change. get it at any auto parts store.

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The transmission, 4L80E, will not shift out of first, abs light is on, no speedometer, no heat or a/c, all at the same time, then all went back to normal with gerky trans shifting, then all went to ma


i have a chevy c3500 with a 4L80E tranny. recently it started shifting funny. one day it wouldnt shift out of (i think 2nd) and my max speed was 35 without winding out tranny. drove it later that day and it wad fine. this happened about six other times and after turning truck off it corrected itself. now that isnt working and it wont shift. any suggestions anyone?

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Replaced TBI with Carburator, 4L80E wont shift


all u need to do is get a holley electric choke carb model i think is 4150 or 4160 and get the tps sensor adapter for it it is around $110 and the carb is around $290 ur trans shifts off of the tps. all the other sensors are useless. i had that same problem with my 94 silverado.

Nov 10, 2009 | 1991 GMC Suburban

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My 2002 Dodge Durango, 4.7L 4X4, idles up and down, is starting to overheat on longer drives, and now is shifting very funny. Oil is good, antifreeze is good. Scan at Autozone only shows random misfires....


Sounds like more than one problem.As for the heating issue could be a (weak) water pump.If the miles are pretty high it wouldnt be a bad idea to service the tranny either.My 5.9L dodge shifted funny too. I changed the fluid and the screen. Also put a little sea foam in it.

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4l80e shifting problems


SOUNDS LIKE SHIFTING SOLENOIDS ON VALVE BODY INSIDE TRANNY OR IT COULD BE BUFFER THAT COMUICATES WITH TRANNY OR OBC BEST TO LET TRANNY GUYS HAVE A LOOK @ THIS ONE RATHER THAN SPEND A LOT OF MONEY WITH LITTLE RESULTS

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