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2.9 to 4.0 swap

stamina

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Ford Ranger
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4WD
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3” suspension
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265/75/r16
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built her in a storage unit
i have located a 93 explorer with the 4.0 and auto trans, i have noticed a few differences in the wiring with things such as the 4 wheel abs giant connector, i have a 1990 ranger, is this a good candidate for my swap in the future and if so what are the ins and outs of this specific swap? and yes i read all of the threads on this site about it but people don’t seem to mention the abs connector and things of that nature, what all will i need from this vehicle to make it work.
 


SenorNoob

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1.5" Front + 4" Rear
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Into a '90? I'd be trying to find a '90 4.0 harness and roll with it. (91 and 92 should be really close too.)

However, knowing how hard that could be. It should be possible to adapt your existing harness if you're good with diagrams and multimeter.

If you alter, you'll need at least the connectors for EDIS and MAF. Could have to change O2 connector? Maybe even add one to use the 93 computer.

Also 93 can be wired for SFI or batch fire, with or without CPS. Just some thing to look for. A 92 computer would eliminate the CPS, SFI, and second O2 worries. It didn't have any of that.
 
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stamina

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Location
Wilmington, NC
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1990
Make / Model
Ford Ranger
Engine Type
4.0 V6
Transmission
Manual
2WD / 4WD
4WD
Total Lift
3” suspension
Tire Size
265/75/r16
My credo
built her in a storage unit
Into a '90? I'd be trying to find a '90 4.0 harness and roll with it. (91 and 92 should be really close too.)

However, knowing how hard that could be. It should be possible to adapt your existing harness if you're good with diagrams and multimeter.

If you alter, you'll need at least the connectors for EDIS and MAF. Could have to change O2 connector? Maybe even add one to use the 93 computer.

Also 93 can be wired for SFI or batch fire, with or without CPS. Just some thing to look for. A 92 computer would eliminate the CPS, SFI, and second O2 worries. It didn't have any of that.
what about a 92 explorer, i found one near where my dad lives at pull apart, 4wd 4.0, dunno if it’s auto or not, would this fit the bill better? pretty sure this didn’t have 4w abs or any of that other junk
 

lil_Blue_Ford

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92 Explorer should be close. I want to say I had gotten an Explorer harness once though and it was too different but I don’t remember what year. When I was converting my 89 Bronco II from 2.9 to 4.0 I ended up getting a harness out of a junk Ranger, 91 I think it was, had to splice a couple wires because the plugs were different. Unfortunately I didn’t do a good job of labeling harnesses and now I have a couple sitting around that I don’t really remember what they were from.
 

RonD

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You won't use the 4WABS so that part of the wiring harness won't be used, its not connected to computer but to a separate 4WABS module and fuses/grounds
Your 2WABS wiring will stay connected
 

stamina

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1990
Make / Model
Ford Ranger
Engine Type
4.0 V6
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Manual
2WD / 4WD
4WD
Total Lift
3” suspension
Tire Size
265/75/r16
My credo
built her in a storage unit
You won't use the 4WABS so that part of the wiring harness won't be used, its not connected to computer but to a separate 4WABS module and fuses/grounds
Your 2WABS wiring will stay connected
that is awesome ok. i also found a 95 ranger with 4.0 4wd and 5speed, bad fuel pump and won’t start so the guy is selling for 400$, is this a good candidate??
 

RonD

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No, wrong computer, 1995-2011 Rangers used the 104-wire EEC-V computers, OBD2
1990-1994 used the 60-wire OBD1 computers

You can do it but will be quite a bit of extra wiring, and will have EGR system, cam sensor and extra O2 sensor
 

stamina

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Ford Ranger
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Manual
2WD / 4WD
4WD
Total Lift
3” suspension
Tire Size
265/75/r16
My credo
built her in a storage unit
ok i found an
No, wrong computer, 1995-2011 Rangers used the 104-wire EEC-V computers, OBD2
1990-1994 used the 60-wire OBD1 computers

You can do it but will be quite a bit of extra wiring, and will have EGR system, cam sensor and extra O2 sensor
i found a 94 ranger 4.0 auto 4x4, i see the difference now, it has the same interior as my truck but different exterior, and has buckets + center console so i can snag those too, hoping to get it for 4 or 500, also, would a m5r1 from a 95 truck be fine for swap into my 90? it’s the 4.0
 

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lil_Blue_Ford

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For manual transmissions, it’s a good one. Just replace the shift rail plugs before you put the trans in.
 

stamina

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Wilmington, NC
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1990
Make / Model
Ford Ranger
Engine Type
4.0 V6
Transmission
Manual
2WD / 4WD
4WD
Total Lift
3” suspension
Tire Size
265/75/r16
My credo
built her in a storage unit
For manual transmissions, it’s a good one. Just replace the shift rail plugs before you put the trans in.
got on recently, i can’t wait to put it in and i’m 100s sure it’s been rebuilt because it has the plugs in the shift rail, rtv in a couple of the hard to find gasket spots and shows no characteristics of a 105,000 miles trans, this was a fricken steal dude. also what does each of the connectors do? there is a red one on one side and another one on the other side that has a connector coming off of it? i’m assuming it’s reverse lights and NSS? which ones which?
 

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Shran

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Explorer wiring can be used but it’s a lot of work, mainly because of how the wires are ran for the fuel pump/tail lights/etc in the rear of both vehicles. In the end there are only like 8-10 wires you need but sorting through those and finding the correct ones and then attaching them to what exists already will take a lot of time. If you can find a 4.0 Ranger engine/dash harnesses, you will save yourself a lot of time.

I did a 4.0/manual swap in an ‘89 Ranger and used a 94 Explorer with an auto wiring harness as a donor… it worked quite well but I definitely had a good week of comparing harnesses before it all came together.
 

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