I can get AllData schematics for you if you need them.
CK5
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'86 Jimmy 4in Lift, 40’s, tons, 8.1 Swap- 700r4 said PNNNNN
- Thread starter GWeakland620
- Start date
This is not a dedicated trail rig, but does trailer to the destination usually. I am currently in the planning phase of doing a 52/56" spring swap, and getting back to being more road worthy.
We got them Saturday. Full pinout and schematics. He’s going to finish it up at work today.
Man, so many stupid things going on it’s hard to explain it. Long story short, this wiring harness is from an Allison vehicle. The harness was pulled off the wrong vehicle. I’m so pissed.
beags86
Eastbound and Down
So the plan?
My boss is looking for the correct harness right now.
Doh! That sucks dude. You going to pair down the Allison circuits or shoot for another harness?
beags86
Eastbound and Down
The only logical solution here is to swap an Allison in.
I was thinking those extra plugs looked and awful lot like Allison trans ecu plugs now that you mention it.
Not to worry, all is not lost my engine and harness came from an 09 4500 with an Allison and I used WWW.LT1SWAP.COM wiring guild and changed to a 4L80 and have 0 issues.
Why do you need to get a different harness? My harness is from a suburban with a 4l80e tranny and my harness still has the plugs for the 4l80e in it. I just zip tied them up out of the way (remember mine has an NV4500 too). As long as the ECM is flashed/tuned correctly, it shouldn't matter that you have a TH400 behind it (I think I remember that's what tranny you're running).
I honestly think you don't need to get a new harness at all, or remove the connectors for the Allison, the ECM just needs to be flashed correctly. I'm starting to wonder if you need a new harness person to go through this for you...
I honestly think you don't need to get a new harness at all, or remove the connectors for the Allison, the ECM just needs to be flashed correctly. I'm starting to wonder if you need a new harness person to go through this for you...
At this point, we have messed the harness up so much, it’s best to start over.
My boss found a Suburban with an 8.1 and 4L80, so we are going to start over with that. Much easier.
My boss found a Suburban with an 8.1 and 4L80, so we are going to start over with that. Much easier.
beags86
Eastbound and Down
If you already have a bunch of time and money into one that seems really stupid to me. But each his own I guess.
I have zero money into the other one. I’m going to give the guy some money for LKQ pulling the wrong harness.
New harness came in. 100% correct. Mischief better shape than the last one too. Dropped it off at the guys house. He’s going to try and knock it out this weekend. We’ll see.
Questions about your high pressure line. Since the the pump is o-ring style is your steering box as well? Did you use a squarebody hose?
Yeah this is all the lines from the square body stuff. Haven’t changed my lines since they were on the ported 2wd steering box.
Thanks for the info, I'm trying to find a solution for my flare box to o-ring pump.
Wait wait wait wait, I totally messed up. Both ends of my lines are flare. I swapped to a new pump that worked with the 8.1 brackets, but also accepted the flare style. Go back a page or so and I posted the part number.
I know that the fitting in the pump can be changed to the flare one in the TBI era stuff. I haven't tried it on anything past a '93 pump.
Or you would have to do custom lines which could also ( possibly) use adapters. Like to go to AN fittings.
I used that part number and looked at the pump details it said it was an o-ring style.
I want to avoid custom lines and I have a new flare hose already. I’ll probably look for a o-ring/flare fitting at the pump since I need a pump with an offset reservoir like the one @GWeakland620 is running.
