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thanks for all the info/help logan! I haven't dived in yet but I hear the Magnum intake is better than the stock truck one so I will eventually do that. First thing is still to get the truck ready for the big cam, which will probably be getting Hotwire's 05 ECM upgrade working on the truck...

Thanks for that post! I just talked to Chris at Hotwire and he offered my an option I hadn't thought of and I think I like the option. My desire is to put a big cam in my stock 03 Ram 5.7 w/545RFE trans. I was looking at using an aftermarket ECU ( so I could tune it myself) which the factory TCM...

thanks NHD, I emailed them this morning. thanks Dart, I know that would work but I really want to take advantage of the full capability of the factory TCM shifts. Can't help but respect the old school approach though

It looks the factory manual shows what I need except for the comm bus SCI connections (pins 7,46). Says those are for 'indirect' inputs from PCM like Body Identification, ECT, Target idle, MAP. That's a roadblock for me, I don't know how to satisfy those since they aren't direct, hardwire...

Old thread but this it's the best info I've found so far. I have an 03 Ram 5.7 545RFE. I want to use the factory TCU with aftermarket ECU. I understand I need to provide the necessary inputs to the factory TCU - does anyone have info on that, even a wiring diagram would be great. Thanks for any...