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I got a 02 wrx 4eat( yeah I know auto trans suck) that broke, anyways if I get a 4eat transmission from japan do I need the TCM from japan to communicate with the USA wrx ecm? I read on line were people swap transmission and the transmission from japan could only shift to 3rd gear but I read others that had no problems. Those threads are hard to find. Any help will be greatly appreciated!
 
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