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Ok i have a 2004 colorado ls 2wd my 3.5 is blown and would like to swap it out for a 5.3 the transmissions are the same from what ive read but what else would need to be changed.
Thanks for the help guys.
-Woody:salute:
 

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Ok i have a 2004 colorado ls 2wd my 3.5 is blown and would like to swap it out for a 5.3 the transmissions are the same from what ive read but what else would need to be changed
It’ll be easier to sell your truck and buy a v8 truck.
There are several swaps been done in here over the years, use the search feature to answer all your questions.
And the i5 trans is different from the v8 trans
 

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OK I have a 2004Colorado ls 2WD my 3.5 is blown and would like to swap it out for a 5.3 the transmissions are the same from what I've read but what else would need to be changed.
Thanks for the help guys.
-Woody:salute:
Talk to Jamie @04colyZQ8 he builds custom harnesses and can answer any questions you have great guy to deal with and very helpful!

but basically you need

LSX engine of your choice

E40 or E67 ECM depending on motor

motor mounts

custom wiring harness

headers and custom exhaust

transmission or you can use your trans just have to swap the bellhousing with a lsx one

efans, radiator hoses, time, money, a place to work on it, etc.

Sorry if I missed something it's 3AM over here lol

also welcome to the nation
:welcome2:
 

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Have to swap input shafts on the trans too. Not just bellhousing. New torque converter as well.
 

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It would be worth your while to find an engine with a transmission already mated to it.
 
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