I have swapped a 5.7 with a 545rfe out of a 2005 Grand Cherokee into a 1982 Jeep Wagoneer. I have been driving it for about 3 years. Currently the transmission is staying in 3rd gear, the transmission shop said that it is not in the transmission. I am assuming that it is in the ECU. I don't know who or where to go for help. Any advise would be greatly appreciated.
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