3.7 engine / year to year

driveability said:

I have an 02 with a damaged engine. Most of the 02 engines (used) have high mileage, but I see lots of 04, 05 engines with low mileage but am told there are differences in the engines. What are they? Can I install an 04/05 in my 02 ?

Click to expand...

tjkj2002 said:

They are the same from year to year.The only differences are in '03 they changed the coupler on the ehaust manifolds and in '07 they went to a drive by wire TB.

Click to expand...

driveability said:

I'm not taking your advise lightly and do have years of experience working on modern engines so please don't take me asking for more opinions and information as a insult....

I was told by an EBAY seller the intake manifolds and electrical systems were different.
I have a computer controls back-round, did tune-up and driveability work for years on G.M. systems at the dealership level..

So the manifold coupler, the intake, the electrical systems, and that may be something huge or just rewiring some connectors etc..


Could I get some more input ??
Thanks John

Click to expand...

tjkj2002 said:

hah.gifhah.gifhah.gifTaking anything that a ebay seller is saying as anywhere close to being true is your first mistake.

'02-'04 3.7's are identical EXCEPT for the exhuast manifolds,that is only for the maniflod coupler's where they attach to the rest of the ehaust.It's not 100% forsure that the '05-'07 3.7's are identical due to a different manufacturer for the engine,but the last '05 KJ I worked on had the exact same intake manifold on it as my '02 did,part #'s matched.They did change some of the electronic communications in '05 so of the sensors may be different but they are in the same location.


But why buy a used engine anyway? You can get a new short block,no core charge,for cheaper then 90% of the used engines on the market anyway and then you'll be getting a brand new bottom end.

Click to expand...