Basically, all engines are mechanically identical (Your 1976 Chevy 350 V8 and 1999 Toyota Corolla I4 all work the same) You can do it, but you must make both motors identical, this may include swapping sensors, tone rings, and other stuff like that.

It can be done though.

 

DONT DO IT..................i tried an 04 3.7 in an 03 liberty.....after a month still trying to figure out how to make it work........
for example, had to swap the crankshaft, all sensors, injectors and it still doesnt run right. and modifying the pcm info doesnt work right either

 

Ohh! The dreaded tone ring issue. 1999-2001 4.7 V8's had 16 teeth tone rings, and 2002-2004 had 32.

I hear your pain.

Just swap those two out, and use all the old electronics.

 

Easy fix

This is actually an easy fix.

When you change out to a newer motor, you have to do a few things to make it work.

1.Change the reluctor to the original one from your vehicle.
2.Change the cam sensor to the original one.
3. make and install an egr block off plate if yours did not have one.
4. Use the original instake and connectors if different.

I did this to my 2003 Liberty to a 2007 motor and it worked perfectly.
Drives like a new car and I now have 2000+ miles on my swap.

Good luck and good driving. You will enjoy your Liberty.:welder::welder:

 

hi i am also looking to put a 2004 3.7 Liberty motor in my 2002 Liberty it is also a 3.7 so all i need to do Change the reluctor,cam sensor, install an egr block off plate original one from the 02.

 

Now how involved is this swap? Do I have to pull the crank shaft to do the swap?
Because if it is super involved I just get a remaned engine and have all new inners.

 

You will have to pull tha oil pan off and the valve covers,not 100% sure if the crank has to be removed though.It's a pretty involved job,not hard just takes some time.

 

Engine Swap

Hi Guys.
I have a 2002 Liberty that blew up. So i bought a 04 Motor. I swapped the toner rings and camshaft rings. Did complete rebuild on the 04 motor in the processes. The problem I am having right now is the torque converter and the crankshaft. I did not swap the crankshaft from the 04 to the 02. I am using the 04 crankshaft. The rear frange is too small on the 04 crankshaft. Would it be easier to source a 04 tourque convert instead of swapping the crank itself?

 

Sorry Sorry hijack but I blew up my 04 3.7. Is there another year complete engine I can use where I don't have to swap the ring on crank as I don't mind swapping cam toners just don't want to open the bottom of a good engine

 

Hey so it depends on when in the year your jeep is made half are 2002-2003 3.7 engines and half match 2005-2007 I have the ealier half I have a link you can use to check and I think the cut off is the end of May so if it's may more then likely 2002-2003 will work and may have a 45rfe like me and if you want pretty easy to upgrade to a 545rfe it's just a tcm upgrade to a 545rfe as the difference is mainly the tune on the transmission

 

hi i was wondering if it is at all possible to swap out the jeep 3.7 for a dodge 3.3l i've been thinking about doing this for a while now because the liberty i have has 215,568 on it and im afraid that at some point it will throw a piston threw the motor so i was just wondering if it was at all possible.

 

3.2, 3.3, 3.5, 3.6, 3.8 won't work easily- swap won't be easier than 4.7 or even 5.7 late model Dodge/Jeep motors. If it's got some serious noise to it there'd be some cause for concern but honestly- even these motors see over 400k fine. If it runs good and you stay on top of small serious issues while they're small it should last great. (like rad leaking, fan clutch dying, fan sensor not working, water pump, etc)

 

OK this is my first post ever so I hope this gets seen as this is an old thread. I'm the unfortunate owner of a 02 Liberty Sport with a blown 3.7. We pulled another from a 04. From what I have seen we need to change the reluctor plate. I have obtained a new "16-tooth" one since mine was actually broken on the blown engine. We have a new timing chain set to put in place and will use the toner wheel off the old. Do I need to change any sensors? Crank position sensor? Just looking for advice on anything else we may need to do to get it running.

 

The Gears on the Cams need to swaped to. I used the entire timing set for a 02 motor on my 04 block
When my blew I got a used 04 and completely tore it down and used all eternals. The block is the same.
The biggest difference is the timing. I also used my intake and top end off the 02 on the 04 block.
The biggest thing to watch for is the Crank snout. I used a 04 crank because it was good with the other motor.
The snount where the tourqe converter sits had a sizer bearning in it for a 04 converter... That took me some time to figure out!
A little heads up for ya. Any other questions shoot me a email. luthiren@gmail.com. I have a 04 now in my 02 with 5000 miles on it. Running great.

 

I have a 2004 Dakota 3.7 and the big thing I see in these motors is overheating . Mainly with poorly maintained cooling systems and failed water pumps. I have owned it since new and maintain it diligently but have had water pumps fail in 67,000 miles 2 Mopar one and one new aftermarket. Dead ones I have seen have been ran hot and suffer from problems with the heads.

 

We have it torn down now, pulled the crank and have the reluctor ring off. The engine (130K on it) looks pretty clean, no sludge in the oil pan, oil looks good. We will use new bearings, and we have a new '02 timing set for it. When my 02 blew, we discovered one of the chain tensioners in pieces when we started tearing it down so we wanted to start out with new timing components.

 

I have a 2004 Jeep Liberty 2wd, that was rolled in an auto accident. runs and drives, just with the new roof configuration its a little airy. i can get my hands on a 2002 Jeep Liberty 4x4. is it possible to take my 3.7l engine, engine wiring harness and ecm out of the 04 and transplant it into the 02? will this solve the reluctor ring engine timing issues if i transplant everything over?

 

Wow! I am doing the same thing...my teenager rolled our 04 Liberty, I found a nice 03 with no motor...now it looks like aBIG job to swap out the rely tot ring etc.
I'm hoping that I ,too,can use my 04 ecru in the 03 body...
Anyone ??

 

I have a 02 3.7 running motor in need of 04 3.7 any here got one

 

After reading all the replies to the original poster of this thread, I see that no one actually answered the question that was asked, which was, "I was thinking of putting a 04 engine in and then also swap my PCM for a newer 2004 PCM with the later engine tune that should be calibrated for the 04 engine. Does anyone have any knowledge if this should work? I would expect the wiring harnesses to be the same between the 02 and 04 engines and would think everything would just bolt right up and fire up."

I would agree with the original poster that when swapping out an '02 engine using an '04 or later 3.7L engine, it seems logical that the simplest solution would be to swap out the existing PCM with the correct one for the replacement engine. I have an '02 Liberty that has a good body and interior, but needs an engine, and have found an '05 Liberty where the opposite is true, the engine has 140k miles, and can be purchased quite reasonably, so have thought about taking both the engine and control devices from the '05 to do the swap, without need of messing with crank reluctors, etc. Has anyone actually done this, or does anyone know why this solution would not be viable? If so, please respond.

 

The only problem with that is the ecu is vin programed so you would have to swap vin plates as the new update won't allowed the older vin on it I don't believe I am going through this my self rn just don't have the funds to do it just doing alot of research and giving info I have gotten over my journey to be honest would be easier to get a tuner and tuner the old ecu the same way as the new one because there are connectors and wiring you would have to change as well.making it a bigger job as the harnesses have changes over time like going from a 3 pin connection for the throttle body to a 1 pin and they even take a sensor off the intake manifold so unless you change everything there's no point you would pretty much be stripping it down to just the shell and rebuilding it from there.....

 

I think the third post in this thread explains the reason why you want to follow the advice of the fourth and fifth posts.

Since it's basically the same engine, the 2002 PCM should continue to work, but apparently it needs 2002 sensors and such. Apparently, they changed sensors and such for 2004, so you may be doing a complete rebuild of the electronics if you try to use a 2004 PCM.

It seems the trick is remaining with your 2002 electronics, and fooling the PCM into believing you still have a 2002 engine, by following the advice of the fourth and fifth posts.

 

Pickup truck I know a Dodge little pickup truck 2003 engine is interchangeable I do believe

 

I'm pretty sure anything from a 99 to 07 is it maybe I might be wrong probably am