5.7 to 6.1 swap, engine stalls out

Asked by camkaiwill0306 Feb 24, 2019 at 09:28 PM about the 2007 Dodge Magnum R/T RWD

Question type: Maintenance & Repair

I have a 2007 dodge magnum 5.7 that has a blown head gasket, i had a 2008 dodge charger srt8 motor/ tranny that i pulled from a car of mine that got totaled out in an accident. i put the SRT8 motor into the magnum. When i got the car out the shop, the car stalls at stop lights/signs.  i went to a performance shop that told me that i needed to install the SRT8 tranmission and get a mopar TCM.  I ended up installing the SRT8 tranny and after about a month of driving the tranny went out and had to re-install the original 5.7 tranny back in.  I am sitll having the same issue where the car stalls out at stop signs/ lights.  The same performance shop still says that i need to change the TCM, ive tried to look at forums and cant find one that is specific to whats going on with my magnum.  PLEASE HELLLLPPP!!!

2 Answers
70

AndrewHigdon answered 4 years ago

It might need an ECM or TCM update. The various components also need to be able to talk to each other. You might need to take it to a dealership to get them to program the new new combination. As far as the stalling issue, I too have that problem. Next I’ll get the dealership to replace the gas tank, which is free for life, per NHTSA bulletin. I’ve tried just about everything else.

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