Question about 1993 Chevrolet K2500

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I have a 1993 2500 that came out with a 4l60e

Im replacing my 4l60e with a 4l80e have everything done but i need to hook up the input speed sensor to my ecm how do i do this

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  • Contributor
  • 51 Answers

Change speed sensor plug in did you also change the ecm because you have are it won't shift

Posted on May 17, 2014

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Posted on Jan 02, 2017

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Molson02536
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SOURCE: turbine input speed sensor

NO the sensor is out side the transmission. And it might just be a bad connection due to being out in the eliments. On the 3.1 your going to have to jack up the car to get to it from underneath and you should see it on the passenger side may be on top, Sorry been awhile and carful not to brake the clips that hold the wire to the sensor when disconnecting.
Good luck and hope this helps

Posted on Apr 09, 2009

csmock132
  • 4669 Answers

SOURCE: putting a 4l80e out of a 1996 3/4 ton pick up into

This isn't going to work without a lot of work. You will need to change the harness and you will likely also have to change the computer. Both speed sensor have to be plugged in

Posted on Apr 07, 2010

skychief2001
  • 21873 Answers

SOURCE: replaced my vehicle speed sensor on my 2003 impala and the ****** wont shift and the speedo wont work is there a reset needed on the ecm to relearn the new sensor

Not that I know of. You replaced the speed sensor on the transaxle ?
Is it possible you got the wrong sensor or the gear in the transaxle is damaged ?

Posted on Aug 15, 2012

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1 Answer

Im putting a 95 chevy 454 and a 2004 chevy 4l80e automatic transmission into a 1991 chevy 2wd pickup . What wiring harness wil work to make everything work correctly


Thats pretty tough to answer since, harnesess borrow different feeds off the engine harness for when you accelerate to tell the tcm info from the tps sensor....another sensor it reads from is the brake sensor to tell the tcm when to tell the trans to downshift. You really need to seek a qualified technition that knows how to mix harnesses... sorry I couldn't helpout more....sounds like an awesome project. Call a an auto wire harness maker with your info and have them custom make you a harness...

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My 2005 4L80e poped out of drive at 65 mph and now it does not go into drive and it goes to idle and coasts when I let off the gas.


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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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CANT FIND WHERE THE SPEED SENSOR IS NO MY 1995 OLDSMOBILE AURORA


hi , their is two different speed sensors on your vehicle one is the input speed sensor which is inside the transmission and the transmission will have to be removed to replace it the other one s the output speed sensor is located directly above the passenger side trans-axle shaft. your input sensor is the sensor which tells the transmission when to shift and the output speed sensor tells the speedometer what it should display and both those parts are fairly cheap they are around 15-25 dollars but just remember if your input speed sensor is bad it is gonna cost you a minimum of 1000 dollars to have a mechanic fix as the transmission needs to be removed hope this is what you needed

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Putting a 4l80e out of a 1996 3/4 ton pick up into my 1998 1/2 ton replacing the stock 4l60e that only has a vss sensor. Could I use the stock harness, if so which speed sensor should I plug it into the...


This isn't going to work without a lot of work. You will need to change the harness and you will likely also have to change the computer. Both speed sensor have to be plugged in

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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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4L80E trans. Lost passing gear/overdrive suddenly


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

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4L80E trans harsh and late upshifts


Found trans to be a mis build,, had a rear planetary with no reluctor ring for the output speed sensor ,, sensor was picking up a false signal from moving internals. This caused a gear ratio error, wich defaulted the trans and was not contolling the pressure, default pressure went high causing late and harsh shifts .

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