6.0 LS Swap

[JeremyB]

You are making great time on the swap. I will be doing this within the next 12 months. Im interested to see what you do with the hood.

Few questions:
How many miles were on the engine and trans?
The novak adapter works for the 4l80e to the NP231?
I know the 4.0 and the iron LS blocks are about the same weight but did you notice any drop in ride height? I wondered this because V8 vs. I6... different weight distribution, etc.

1. The engine and tranny had 98k on them.
2. No. No one has a 4L80E to 231 adapter that I know of. You can have one made for around $600 and then still have to change the input to 32 spline. I am using a 32 spline 241c ($150 at local junk yard) and reclocking it. Much stronger and you can still use a SYE.
3. No. We are talking maybe 25 lbs (total engine, trans and t-case) and I will get that back when I change the heads. I did not notice any change in lift height.

Sorry no updates in a couple of days, but I have been in wire mode. I am in the proses of finishing the interior wiring. I have moved the Jeep PCM to under the passenger rear seat, main Jeep Fuse Box to under the driver rear seat and the GM PCM to under the driver seat. This has been a huge job! With a little luck I will finish it today.

The PCM should be back from the programmer sometime this week! Finally get the fire this thing up. Cant wait.

 

[kastein]

Wow, SYEs for the NP241 are kinda expensive, but not that bad, all things considered.

 

[JeremyB]

Wow, SYEs for the NP241 are kinda expensive, but not that bad, all things considered.

Its the cheaper route in my case.

231.
SYE 200
32 spline input 150
4l80e to 231 600
T-Case 100
$1050

241.
SYE 350
T-Case 150
4l80e to 241 50
$550

 

[kastein]

Yeah, it most definitely makes sense for your situation... has me thinking, too, an NP241DLD is liable to end up in one of my rigs soon. I could put an NP231 in, since it's behind a gasser NV4500 with a 23 spline output, but why bother when the 241's a bit stronger and I already have it?

 

[racer32]

...and the GM PCM to under the driver seat.

I'd love to see a couple pics on how you did this and how you routed the wiring.

Keep up the good work

 

[JeremyB]

I'd love to see a couple pics on how you did this and how you routed the wiring.

Keep up the good work

Here are some pics of the wiring and locations of the PCMs and fuse box. Please keep in mind I am not done with the wiring, it will look way better when finished. Hopefully I will finish it tomorrow.

The entire GM harness enters the firewall where the old Jeep trans harness was.


After it enters the firewall it runs under the center console to under the driver seat.



Here is the fuse box under the driver rear seat.



And the Jeep PCM under the passenger rear seat.

 

[racer32]

Awesome Jeremy, thank you for the excellent documentation of everything.

 

[John D]

Sorry no updates in a couple of days, but I have been in wire mode. I am in the proses of finishing the interior wiring. I have moved the Jeep PCM to under the passenger rear seat, main Jeep Fuse Box to under the driver rear seat and the GM PCM to under the driver seat. This has been a huge job! With a little luck I will finish it today.

I wish I had been smart enough to think of this. It would have been so easy when I built my harness

 

[XJ McLovin]

hope you don't mind more questions...

So the 6.0 PCM controls the transmission right or does the trans have its own controller? It just needs to be reprogrammed for your specific trans? The reason I ask is... it might be easier for me to find my trans and engine separately.

I assume your still using the jeep computer to control your stock gauges?

 

[JeremyB]

hope you don't mind more questions...

So the 6.0 PCM controls the transmission right or does the trans have its own controller? It just needs to be reprogrammed for your specific trans? The reason I ask is... it might be easier for me to find my trans and engine separately.

I assume your still using the jeep computer to control your stock gauges?

Yes the GM PCM controls the trans. The 4l80e is an all electric trans. You can buy them separate just get the harness with the trans if different than what the donor engine had. You could get a 700r4 or Turbo 400 if you did not want an electric trans. This was not an option for me due to the fact the 4l80e came free with the engine.

And yes I am using the Jeep PCM to run the factory gauges.

Speaking of the Jeep gauges I am wiring up the Jeep PCM now. Does anyone know what the SCI Transmit and Receive wires are? I believe they go to the DLC?

 

[JeremyB]

I wish I had been smart enough to think of this. It would have been so easy when I built my harness

Don't feel bad. The only reason I did is because of my younger Honda swap years.

 

[yossarian19]

Don't feel bad. The only reason I did is because of my younger Honda swap years.

How many swaps have you done? Over how many years?
None of my business of course, but I like to put these things in perspective.

 

[JeremyB]

How many swaps have you done? Over how many years?
None of my business of course, but I like to put these things in perspective.

I did 2. Civic B18c5 turbo and one Integra K20 all motor back around 2003-2005 or so.

 

[JeremyB]

Yesterday I was able to tap the water pump for the steam ports and install the upper and lower hoses. Installed the heater hoses, all vacuum lines, toped off all fluids and soldered the throttle cable. Today I am finishing up the trans cooler lines and fuel lines then she will be ready to test fire on Monday when the PCM gets here. After that I just need to order a driveshaft and complete the exhaust.

 

[JeremyB]

Here are some better outside pictures.

 

[yossarian19]

Very, very cool.
How did you get the intake that smoothed out? Grinder + sanding + paint?
You are going to love this, I'm sure.

 

[JeremyB]

Very, very cool.
How did you get the intake that smoothed out? Grinder + sanding + paint?
You are going to love this, I'm sure.

Yes. I used a grinder and different sanding disks. Then panted it with textured paint, I didn't want to use filler on an intake. A lot of time, but it turned out pretty good.

 

[jamiemac]

JeremyB, What method are You using to lengthen the wires for the PCM. Are You cutting the wires in the middle, and soldering in the length You need, or are You removing the wired from the connector, and adding length, then crimping on a new pin? I plan to go the first route, and am wondering if I'm off base there.

 

[XJ McLovin]

Looks great. I can now see why you would want to mount the trans as high as you can, to get the engine to tilt forward as much as you can.

 

[JeremyB]

JeremyB, What method are You using to lengthen the wires for the PCM. Are You cutting the wires in the middle, and soldering in the length You need, or are You removing the wired from the connector, and adding length, then crimping on a new pin? I plan to go the first route, and am wondering if I'm off base there.

For the wires I had to extend I cut them in the middle and extended them and soldered both ends. Surprisingly I only had to extend about 30% of the wires.