Join Date: Aug 2006
Location: Stuck in Indianapolis until the end of time
The 3.2 and the 3.5 are nearly the same.
The big difference is the year of the car.
Dodge made lots of small changes in 2002.
The engine wiring harness on your 04 will not connect to the PCM in the 99
and you cannot take the PCM from the 04 and make it work with the wiring in the 99, so
if you want to swap the 3.5 into the 99 you have to throw away the 3.5 engine harness and
use the 3.2 harness.
That is just one of the modifications you need to do in order to use the 3.5 in the 99.
Another example: The 3.2 has an EGR valve and electrical connection. The 3.5 does not.
So, when you swap over the wiring harness, you will have a connector for the EGR valve but
Another example: The 3.5 has different IAC and TPS sensors. You would need to swap
the throttle body and sensors from the 3.2 to the 3.5.
Flex plate and left cam gear need to be swapped.
You can order a manual from Daytrepper. It covers the whole process.
Good luck with your project.
Last edited by tgs; 08-29-2012 at 09:46 PM.