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You can use the PCM from a 2.7L, 3.2L and the multiple 3.5L versions. You can't use a 2002 - 2004 PCM in a older 98 - 2001 because the whole wiring of the system was changed. Also the PCM from 2002 - 2004 has the TCM built into it. You can change it out but you would have to pretty much rewire the whole car.

I used the old 3.2 PCM.

Dodge did away with the EGR after 2002 because the motor can pass emissions with out it. Also it helped when they cut back on stuff over the years on the LH class.

The 3.2L is a High Output motor and theres two versions of the 3.5L, theres the magnum and the High Outout. The magnum doesn't have the MTV valve and has less connections on the intake plenum. The high output plenum from a 3.2 is the best thing to use and using a 3.2L plenum will make a 3.5L magnum run as a high output. You can convert a magnum plenum just by drilling a few holes for vacuum lines.

If you have a 98 - 2001 car and you want to drop in a motor from a 2002 - 2004 then you have to change out a part or two. The right cam sprocket from the old motor will have to be used. Reason for that is the timing systems are different and this will set things right for the old PCM. The timing belt is the same size so you don't have to worry about that.

Just so you know most of the 3.2L parts will work on a 3.5L. The only difference from the 3.2L and the 3.5L is the bore. The 2.7L is a whole different motor, only thing compatible is the transmission, flexplate and torque converter.