What all is involved in changing from a Quad 4 to a 2.2 engine and trans? I would like to know if the wiring harness is the same at the firewall for both so if I had the harness for the 2.2 it would plug in to the existing harness at the firewall and I am sure I would have to switch out the PCM as well...also are all mounts in the correct positions, axles the same??? any info would be appreciated, Thanks