So I have been wondering for a while now and haven't seen much on the subject that I've found helpful or been able to make any sort of sense of what was being said. I have a 2006 Ram 1500 with the 5.7 and it's a 4x4. I want to swap the trans and put something better in it or at the very least find a place that can build a strong 545 RFE with good parts that can take a beating from added HP and Torque figures. I've been looking around and have found the NAG1 or the 8HP70/90 transmissions. Does anyone have any kind of insight about if it would work or not? Mostly wondering if it will bolt into place right. If it will bolt up well everything else will be able to be worked out with the right amount of cash and time.