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4L80E tranny wont shift

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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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.

Posted on Apr 21, 2014

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Posted on Jan 02, 2017

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SOURCE: shifting prob

Your sinchronizers are worn. They might need replacement. A temporary fix wich can help shifting is replacing your actual gearbox oil with a synthetic lubricant. These lubricants help reducin noise and make shifting softer.

Posted on Nov 13, 2013

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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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