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'89 Bronco II 4.0 Swap Questions

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Old Sep 3, 2024 | 11:21 PM
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'89 Bronco II 4.0 Swap Questions

My 15 year old son is looking at possibly buying an '89 Bronco II that will come with a 4.0 and 5spd from a 2000 Ranger. The guy has the 4.0 in the Bronco but no wiring has been touched. I was wondering if someone has a good link on what is required for this swap. I've done some searching and it seems the '89+ are the easier years to do this swap with, but everything I've seen was using a pre-96 4.0 engine and harness. A 2000 would be OBDII. How would that work out. I'm assuming you would need the 2000 ECU and a lot of wiring changes, or fit a pre-96 engine harness on the 2000 engine.

I'm not too concerned with a fair amount of wiring as I've done the Mustang EFI on my first gen. I'm more concerned with not getting all the right parts and costing my son too much.
 
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Old Sep 16, 2024 | 03:19 PM
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Well, we picked it up yesterday. Does anyone have wiring diagrams for the '89 Bronco II or 2000 Ranger 4.0?

 
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Old Sep 27, 2024 | 06:23 PM
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Any progress?
 
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Old Sep 29, 2024 | 09:58 AM
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Wow, I didn't think anyone was here. Not much to report now. Mostly he's been cleaning inside and out. It's going to be slow progress as I still have things to fix on my Bronco.
 
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Old Sep 29, 2024 | 11:30 AM
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Not much traffic here. I look here every once in a while. I ended up having the 2.9L rebuilt a few years ago and then the A4LD about a year later in my ‘89.
 
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Old Sep 30, 2024 | 12:26 PM
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Finding a 2.9L would certainly be the easiest and quickest way to get it back on the road, but I think the 4.0L is overall a better engine. The next easiest would be to find an EEC-IV harness and ECU from something like a 94 Explorer, and this will be a backup option if for some reason we can't get the '00 EEC-V harness and ECU wired up correctly. Having the OBD-II controls and ability to connect it to my OBD phone app will be nice. So that is the current plan.
 
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Old Sep 30, 2024 | 02:33 PM
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The 4.0L engine would have been better but I don’t have anywhere to swap an engine. Since I was paying for it to be done the 2.9L swap didn’t require any extra work to require the harness. I don’t need OBD-II so and definitely don’t need my phone to talk to my vehicle.
 
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