3.9 swap
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3.9 swap
How ya'll are?
I have an '01 3.9L 2wd 5spd pickup that's been to hell and back several times. I have a wrecked donor truck ('98 5.2 4wd Auto). What would I need to swap the engines? Everything in the donor truck is in decent condition, engine is unharmed and runs like a top.
Thanks for your time and much needed help.
I have an '01 3.9L 2wd 5spd pickup that's been to hell and back several times. I have a wrecked donor truck ('98 5.2 4wd Auto). What would I need to swap the engines? Everything in the donor truck is in decent condition, engine is unharmed and runs like a top.
Thanks for your time and much needed help.
Veteran
Joined: Oct 2010
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From: Beaverton, OR
I'm not sure of the exact changes from the 98-01 (I know there were a lot of small wiring changes from 97-98), but I would bet that you could take the whole 98 engine/harness/PCM and plug it all in to your 01.
Keep in mind there may be plug style changes and you may have to transfer over some of your 3.9 harness plugs. Also, I'm not sure if the 2001 PCM will integrate with your gauge cluster, but that's an easy swap if not. Hopefully someone can chime in with that info.
Another option is to add in the wiring needed (injectors, extend the alternator and AC wires) to your 3.9 harness and use that, but I think that would be a pain.
Also keep in mind that Federal EPA laws state that you can only use the same year or newer, so if you have emissions testing, they will see it's a 98 PCM.
I'm using a 96 drivetrain in my 98 Jeep, but the PCM is 98 so it can talk to the gauges.
Keep in mind there may be plug style changes and you may have to transfer over some of your 3.9 harness plugs. Also, I'm not sure if the 2001 PCM will integrate with your gauge cluster, but that's an easy swap if not. Hopefully someone can chime in with that info.
Another option is to add in the wiring needed (injectors, extend the alternator and AC wires) to your 3.9 harness and use that, but I think that would be a pain.
Also keep in mind that Federal EPA laws state that you can only use the same year or newer, so if you have emissions testing, they will see it's a 98 PCM.
I'm using a 96 drivetrain in my 98 Jeep, but the PCM is 98 so it can talk to the gauges.
Administrator
Joined: Apr 2010
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From: Clayton MI
The PCM from the 98 won't work either, it will be expecting an auto trans at the other end of that harness, and won't find it.... that will confuse it, and you will have a perpetual CEL.
Same goes for the wiring harness. The only part out of the donor truck you can use is the engine. Nothing else is the same.
Same goes for the wiring harness. The only part out of the donor truck you can use is the engine. Nothing else is the same.
Veteran
Joined: Oct 2010
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From: Beaverton, OR
The 3.9 harness can easily be adapted to the 5.2 if he's keeping the 5-speed, if one knows wiring and has the books.
Legend
Joined: Jun 2009
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From: orangeville ontario
i replaced the 3.9 in my 91 with a 5.2 and had to make a motor mount extension plate for the one side. not sure if the 01 would have the same problem but it would not surprise me if it did.
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Thanks for the help.
I plan on keeping the 5spd tranny. Not a fan of automatics.
What is CEL?
And they don't do emission testing where I'm at, if they change it, I know all the people in town that do the Inspections, so I could get away with it if need be.
I plan on keeping the 5spd tranny. Not a fan of automatics.
What is CEL?
And they don't do emission testing where I'm at, if they change it, I know all the people in town that do the Inspections, so I could get away with it if need be.
