Joe1967ls

iTrader: (5)

We just finished a 5.3 swap in a '56 F100 with an '04 truck harness and a 4L60E. We took it for a test drive and it doesn't seem to be shifting right. It's looking like we have an '07 trans with the 15 pin connector. Is there a way to make the 15 pin trans work with the '04 harness?

LS1MCSS

iTrader: (18)

06 to 09 use the 15 pin connector. I didn't take time to study the schematics but I suspect you can use that tranny. You'll have to get the newer connector and wire it into the harness by comparing the two different set of schematics.

FastActon

I'm also working on this build. It seems to me that the extra two pins are for the input speed sensor (ISS), right? If you use a 13 pin harness, are you actually doing much besides losing some additional data? Or is there some difference inside the transmission that requires the PCM to use the ISS data to operate the transmission correctly?

BOXCHEV

iTrader: (3)

Ya know what, I have a 2007 4l60e from a silverado and never noticed 15 pins. Will have to go take a mirror and flashlight and look cause it's already in the car. Just got done plugging in all my connections to the trans too. I'm using 13 pin connector.

fox12303

iTrader: (7)

I have an 4l70e from a 2007 Trailblazer. Though I am going to use TCI's EZ-tci controller, it was a specific kit for the later 15-pin(brown connector). Originally it would have used a 42T controller too which is different than the earlier models I believe. My suggestion is you call Jon at PSIConversion 732-691-6531 as I think he can sort out your issues. Haven't used his products yet but I've spoken with him and he seems to be very knowledgeable.

BOXCHEV

iTrader: (3)

Guess I might be in the clear.

Just snapped this pic. VIN# that was on the tag of the trans 1GCEC19V17Z119585

https://secure.carfax.com/creditCard...EC19V17Z119585

FastActon

Just to give an update, after some more driving the transmission is shifting fine. The tranny had been sitting for a couple of years, so it may have needed a couple of heat cycles to get everything working properly, plus PCM learning. It looks like you don't need to worry about the extra two pins.

Cristian Gallardo

Just wondering if you guys were able to run the 15 pins 4l60e trasmision with the 13 pins harnest?????
I'm making some research because i got the same problem

MaroonMonsterLS1

First off...you just asked a question on a 7 year old thread. Come on, use some common sense
Second...yes, if the Transmission has 15 pin plug, but the body harness only has 13...you can use it no problem. The extra 2 pins are for the ISS and they just won't be used. No big deal

If the Body harness has 15 pins and the trans only has 13...then you will have issues