96 5.7 4l60e harness to 97 5.7 4l80e trans

[thegawd]

heres some electrical info from the site posted above.... I just like to see this info right here.

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[dj_97]

Thanks for the help guys. I started setting motor and harness in yesterday but forgot I didn’t switch out new mounts so hopefully finish putting driver side mount in today and set it. The trans has been rebuilt before, and I’m kind of hoping it has a manual valve body. Idk, well see lol. If not I ordered a ecm from flashmasters on eBay. I’m gonna try to run it with tranny unhooked and see about yard driving when I finish it all up, maybe this weekend. Still have to get motor and harness in and then follow with radiator and all that junk

 

[dj_97]

Updates! Getting closer, ECM is expected to be here Monday, so it’s coming along! Thanks to every single one of you guys for help wisdom and advice, it’s greatly appreciated! Love this group and the knowledge here!

 

[dj_97]

On her way

 

[dj_97]

Have gotten the service manuals from here? All the info is there, diagrams color code a all. Your not keepng the 4l80 in the truck?

Where is the diagrams??

 

[dj_97]

The "LS Stuff" you're finding, does it look like this? Scroll down to where it says "Wiring Conversion."

https://sites.google.com/site/sloppywiki/everything-ls/4l80e-info

If so half of it still applies as you're doing it at the transmission connector, and that didn't change. You remove two pins, move one, and leave the other out. The only thing that's different from the instructions there is the two pins/wires you have to add at the PCM for the input speed sensor on the 80E. Our PCMs are different, so those pins are in a different location. That info can be found in the factory service manual for your year as mentioned. We don't have the '96 GM factory service manuals archived here unfortunately so you'd have to find one somewhere else to verify. My '97 C1500 4.3L was pins 7 & 8 on the gray C3 connector but that may be different on a '96 V8 PCM.

If you don't want to mess with the transmission connector there are a few companies that make 60E to 80E conversion harnesses that take most of the work out of this. You still have to dismantle one of the PCM connectors to add the ISS wiring but the harness kits include the ISS pigtail with connector already installed.

https://www.mrk-motorsports.com/store/adapters/gm-4l60e-to-4l80e-transmission-conversion-harness/

And yes, you will need to have your PCM tuned to control the 80E.

Can you PM me? I have a few questions you can probably answer!!

 

[df2x4]

Can you PM me? I have a few questions you can probably answer!!

Sure, but fair warning, I think I've already given you most of the info I have. PM incoming.