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So am in the process of swapping my 4L65e to 4l80e
I notice that my trans with internal neutral switch while the 4L80E with external?
what should I do, or I should look for a 4l80e with internal switch? Am not sure if the 4l80e come with internal switch 🤔
i’ll attach a picture , I circled the area in red.
my transmission look exactly the same there is no switch…
There is a switch assembly that bolts on the shifter shaft area on the side of the transmission for some cars..
Or what I did was used a Lokar shifter that has its own switches.
Google this
GM Genuine Parts D2257C Park/Neutral Position and Back-Up Lamp Switch
it may not be the one you need but this is what they various versions look like.
Last edited by pdxmotorhead; Dec 29, 2021 at 04:16 PM.
On some vehicles the neutral switch is mounted to the shifter inside the car. The neutral switch is not mounted inside the transmission. Later model transmissions have a mode position switch or range position switch inside the transmission pan, (I think that is what it's called) that communicates to the TCM what range the transmission is in. I don't think it acts as a neutral switch though. I have not looked at a wiring diagram so you will need to check this for yourself if you have one these transmissions.
Yeah... the Internal Mode Switch does take care of the Neutral Safety Function.
A PCM for a NON-Internal Mode Switch 4L60E/ 65E/ 70E or 4L80E will be needed for the Swap.
4l65e Internal neutral switch 
