4L60E wiring question 72 K10 LQ4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

suburban99 · 04-17-2020, 06:35 PM

After much thought and good comments from members I decided not to install the 700R4 and switch my transmission to a 4L60E..so I traded the transmission I had for a rebuilt 4L60E and have installed in my 72 K10 with a np205 transfer case.
Both are 27 spline. I repinned my own harness a few years back and removed the transmission control wires..so I have made a new harness for the trans and connected it as this per these drawings..

The question I have is where does the pink connector E (round plug) get it's power from? Pin 75 blue on ecm... Or do I have to add a splice to it to give it key-on power?

I don't think I need the neutral switch(C2) as the truck already has a working one in the column, and is wired as such. (truck was running a TH350 for last few years)
Thanks

ls1nova71 · 04-17-2020, 10:12 PM

The power to the transmission plug comes from the main ignition relay, the same one that powers the rest of the LS harness. it should also be fused, generally 10a.

You don't necessarily need the neutral safety switch on the transmission if you are going to use the column mounted one.

suburban99 · 04-18-2020, 01:26 AM

Thanks that's what I figured from the drawing. Just need to reflash my ECM as it's flashed for a 4L80E

04-17-2020, 06:35 PM	#1
suburban99 Registered User Join Date: May 2014 Location: Mission BC Posts: 452	4L60E wiring question 72 K10 LQ4 After much thought and good comments from members I decided not to install the 700R4 and switch my transmission to a 4L60E..so I traded the transmission I had for a rebuilt 4L60E and have installed in my 72 K10 with a np205 transfer case. Both are 27 spline. I repinned my own harness a few years back and removed the transmission control wires..so I have made a new harness for the trans and connected it as this per these drawings.. The question I have is where does the pink connector E (round plug) get it's power from? Pin 75 blue on ecm... Or do I have to add a splice to it to give it key-on power? I don't think I need the neutral switch(C2) as the truck already has a working one in the column, and is wired as such. (truck was running a TH350 for last few years) Thanks Attached Images __________________ 1962 C10 Longbox LS 5.3 4L60E----Sold$$ 2014 Ram 4x4 3500 Laramie Diesel..Momma's truck 2015 Ram 4x4 1500 1997 Boxster. 1972 K10 Custom Deluxe LS 6.0 1950 GMC 3100 S10 & LS swapped

04-17-2020, 10:12 PM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 4L60E wiring question 72 K10 LQ4 The power to the transmission plug comes from the main ignition relay, the same one that powers the rest of the LS harness. it should also be fused, generally 10a. You don't necessarily need the neutral safety switch on the transmission if you are going to use the column mounted one. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

04-18-2020, 01:26 AM	#3
suburban99 Registered User Join Date: May 2014 Location: Mission BC Posts: 452	Re: 4L60E wiring question 72 K10 LQ4 Thanks that's what I figured from the drawing. Just need to reflash my ECM as it's flashed for a 4L80E __________________ 1962 C10 Longbox LS 5.3 4L60E----Sold$$ 2014 Ram 4x4 3500 Laramie Diesel..Momma's truck 2015 Ram 4x4 1500 1997 Boxster. 1972 K10 Custom Deluxe LS 6.0 1950 GMC 3100 S10 & LS swapped



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