Is 300 hp possible from a tbi

[westsoundred]

interesting how-to on the wiring for a 4l80e

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[westsoundred]

and a wiring harness

http://www.nelsonperformance.com/?page_id=850

All I really find are wiring harness for a 1998 and newer 4l60e to 4l80e conversion (ebay has a bunch too), but not my 4l60 to a 4l80e.

do such harnesses exist?

 

[884x4310ci]

What year is your truck if it's 88-92 you have a 700R4. And they can be built to take power. How 93-94 as far as I know are the same 95 is a stand alone year. 96-99 have the black box ecu and is completely different again.

 

[westsoundred]

What year is your truck if it's 88-92 you have a 700R4. And they can be built to take power. How 93-94 as far as I know are the same 95 is a stand alone year. 96-99 have the black box ecu and is completely different again.

my truck is a 1992, with the 4l60 (not e). I think, after reading of the madness of going from a 700r to a more modern 4l80e, I'd prefer a stouter 700r.

I found these guys,wonder how good of a build they do (?)

https://www.monstertransmission.com...n-Heavy-Duty-4x4-4WD_p_5078.html#.XjtBjiOIabg

 

[westsoundred]

fwiw, I'm just using this thread to collect information for my build. Comments are great along the way as well, and thank you

 

[Waterhauler]

The wiring changes going from 4L60E to 4L80E are super easy can can be done almost completely on the transmission plug side of the harness. You just have to remove one pin/wire and move another. The pinout and changes necessary can be found here:

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

The only other thing you need to do is add two wires from two specific pins on your PCM for the input speed sensor on the 4L80E. You can download a factory service manual for your year truck here (thanks to @hatzie) which will have pinouts for the PCM connectors. Find which two are labeled as the transmission input speed sensor and connect your wires to those two pins.

https://www.gmt400.com/threads/88-95-service-manuals.43575/

 

[PlayingWithTBI]

700r4 and 4L60 are the same transmissions - GM just changed the nomenclature to the 4L60 platform sometime in 92 IIRC.

 

[Waterhauler]

Awesome!
Thanks for the reply and all the good info. I’ll certainly check it all out.

 

[westsoundred]

700r4 and 4L60 are the same transmissions - GM just changed the nomenclature to the 4L60 platform sometime in 92 IIRC.

yea, I saw that in the other sticky, I just keep trying to be as clear on my terminology as possible.

 

[df2x4]

my truck is a 1992, with the 4l60 (not e). I think, after reading of the madness of going from a 700r to a more modern 4l80e, I'd prefer a stouter 700r.

I found these guys,wonder how good of a build they do (?)

https://www.monstertransmission.com...n-Heavy-Duty-4x4-4WD_p_5078.html#.XjtBjiOIabg

That answer to that question is a terrible one. Do a quick Google search and you'll find a million Monster Transmission horror stories. Do not give that company a dime.

I don't trust any 700R4/4L60E after my experiences but if someone had to have one I think the only two mail order builders I'd recommend would be Hughes or Gearstar. Both are very expensive.

Awesome!
Thanks for the reply and all the good info. I’ll certainly check it all out.

You're welcome! If anyone in here wants more info on 4L60E to 4L80E swaps I have a link to the swap thread I did on my red '97 in my signature. Click the red text under the pic that says "4L80E Swapped."