Help to find the right HEMI swap harness

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DvOar_GMC

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Hello, I wonder if you can help me with my project.
Basically I'm trying to run an HEMI 5.7 L V8 engine from a donor RAM 1500 year 2015 with 65RFE transmission (6 speed) to be mounted in my project (GMC Truck 1955).
The guys from Hotwireauto and Sublimeparts doesn't have harness + ECM capable of manage my HEMI + 65RFE transmission.
I appreciate your hints and comments.
 
I guess you could go one of two ways. Both involve getting rid of the six speed. " Downgrade" to the 545rfe that Hotwire supports. Or, go 8 speed and use the SoundGerman stand alone to control the trans.
 
Ok. I was trying do not replace the transmission.
What about "swap specialties" ? they say that his harness support 6 speed trans.
 
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