Something you'll need to consider in regards to the computers. The older 5-45rfe until 2003 in most applications used a separate TCM (Transmission Control Module) to give the 45rfe it's 5th gear and I think in your case it's something to consider since, the 2004 Dakota up Dakotas combined the TCM and PCM into one unit and they did the same on the 2004 Ram as well. Not sure on the WJ platform Jeeps. I'm mentioning this because depending on your donor you'll need the TCM wiring potentially. The other thing you might need is if your donor is an 2003-2004 5.7L Hemi Ram is the wiring and sensor regarding the Accelerator Pedal Positioning Sensor.