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Engine replacement
09-26-2009, 03:28 PM (This post was last modified: 09-26-2009 03:29 PM by vigilantiex.)
Post: #1
Engine replacement
Year: 1999
Model: intrepid
Engine Size: 2.7
Auto/Manual: auto
Mileage: 140000


I have a junk 2.7 in my car now. has any one out there tried to swap out the entire subframe to change it into a 3.5? Or will the trans axle swap be easier than that?( provided the electrical is possible too)
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09-26-2009, 11:31 PM
Post: #2
RE: Engine replacement
I have done several complicated swaps over the years and all I can say is with something like this it's probably best to have a complete donor car on hand for the odds & ends that are generally required to make a nice job of it. That way you will also have a working relationship of where the new components are supposed to go and how it will look when done. You might also google the engine swap to see if there's a forum out there with posts from people who have the hands on experience for this particular deal.
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09-27-2009, 08:03 PM
Post: #3
RE: Engine replacement
Had a rainy day here so did a bit of web surfing and stumbled across an article similar to your question but I misplaced the link .

Anyway, as I suspected the author mentioned several of the same things I posted and added there are many accessory items that are particular to that engine. IOW, a COMPLETE engine is a must along with various parts from the donor car that one could never think of in advance. I suspect wiring harness are different along with smaller things like the PS and AC hoses.

BTW, on the last swap I did I spent considerable time fabricating hoses and brackets because it's just the nature of the job. The top and bottom radiator hoses were custom in my case even though I used everything from the same manufacturer.
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09-27-2009, 08:41 PM
Post: #4
RE: Engine replacement
Thanks for the info. I've got my eye on a wrecked police car for a donor vehicle so i would have all the underhood parts and any electronics under the dash i might need. It has the H.O. 3.5 but the whole front end appears to be almost a "modular" design. the mechanics of the project seems possible. But, I was unsure of complications that might be helpful to know of in advance. I have an extensive background in fabrication but wanted to ask around about the other(electronics,fuel pressure, ect..)
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09-27-2009, 08:53 PM
Post: #5
RE: Engine replacement
Sounds like you have your hands full so good luck and let us know how you make out in a few months!

BTW, if you are just interested in "go power" why not use something more plentiful (at least in the USA) like a Ford or Chevy V-6? Much of the powerplant package is modular and easy to come by. All you would need to do is fabricate the driveshaft and mounts plus a bunch of small stuff to finish things off. (like a custom exhaust) They are also near 200 HP without any modifications.
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09-27-2009, 09:04 PM
Post: #6
RE: Engine replacement
I got lots of ideas for the car. Tub it out with a small block? Maybe 4X4? Just thought I'd try a "simple" swap first. I've also got a 94 Chrysler with a 3.3 that just wont die. There are to many differences between them for it to work easily. Besides, I have plans on using it in a trike by summer
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09-27-2009, 09:22 PM
Post: #7
RE: Engine replacement
I didn't mentioin a small block because the total length of the engine may be an issue in the short space designed for a 4 banger. Besides, there's lots of stuff out there to boost a 4.3 V-6 well past 200 HP and it already sounds like it's got a heafty cam in it.
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