4l80e NNBS T42 swap

4L80e NNBS t42 wiring (thank you chris ortiz for the writeup)

Pull your transmission connector, pull the covers and the pinlock out the front of the connector

Now get a pick tool and start pulling pins.

Remove the wire from slot S, Then move the wire from slot U and place it into slot S

Now you’re going to take the wires out of slots K and V.

These will be your new ISS wires. Connect these to an ISS sensor pigtail, Crimp, solder im not gonna tell you how to live your life.

Polarity doesnt matter its a pulsed signal. You will have one extra wire just tuck it up in the loom and tape it up.

Now plug everything in and you’re done on the bottom for wiring.

Now unplug your TCM, remove the locks for the pins, there is one that slides out the side and a backing plate.

Move pin 45 to pin 26, put it all back together and you’re done with wiring.

Now this part is very important if you’re working on a customers car, if not skip this step.

Make sure you move the seat from where the customer has it positioned. Make sure its really far from where they had it.

Now make sure you put the steering wheel tilt all the way up like hes going to be driving a peterbuilt.

Ok now that is done break out your hptuners mpvi. Get on the hptuners website and search the repository for a 2008 chevy express van.

Should only be one on there for the trans segment of the swap

Now youre going to have to license this file to use it, good thing is its only once and can use it on future swaps.

So fire up hptuners and open that file, you will need 3.0+ to do this.

Connect to vehicle and hit the write button, put do not write for engine and select write entire for trans controller

After that is done close the express van file, Hit the read button and save that file as your new 4l80e file for your vehicle.

You did it.