mark corbitt Posted September 17, 2019 Share Posted September 17, 2019 I have an 87 4,0 4x4 and according to build sheet an 5-45RFE automatic transmission, which ECU should I upgrade to? Link to comment Share on other sites More sharing options...
87MJTIM Posted September 17, 2019 Share Posted September 17, 2019 You want one from a 89-90 MJ or XJ with auto transmissions. I don’t recall the part number. I’ve pulled a few ECUs from auto XJs that I don’t need. Where do you live? Link to comment Share on other sites More sharing options...
mark corbitt Posted September 17, 2019 Author Share Posted September 17, 2019 I'm in Lakeland Ga. 31635 Link to comment Share on other sites More sharing options...
87MJTIM Posted September 17, 2019 Share Posted September 17, 2019 You need #5428 for an automatic Link to comment Share on other sites More sharing options...
eaglescout526 Posted September 17, 2019 Share Posted September 17, 2019 7 hours ago, mark corbitt said: I have an 87 4,0 4x4 and according to build sheet an 5-45RFE automatic transmission, which ECU should I upgrade to? Ok hang on. I don't know if it was stated before but the build sheets from pre ‘89 are not incredibly accurate. You should have a 4speed AW4 automatic trans. Link to comment Share on other sites More sharing options...
cruiser54 Posted September 19, 2019 Share Posted September 19, 2019 428 is the most common one IIRC and is for an auto trans. Works well in either application Link to comment Share on other sites More sharing options...
mark corbitt Posted September 20, 2019 Author Share Posted September 20, 2019 12 hours ago, cruiser54 said: 428 is the most common one IIRC and is for an auto trans. Works well in either application thank you. Link to comment Share on other sites More sharing options...
Mattkh Posted September 26, 2019 Share Posted September 26, 2019 On 9/17/2019 at 7:56 AM, mark corbitt said: I'm in Lakeland Ga. 31635 Hey me too! Thought I was the only one in South Georgia on here Link to comment Share on other sites More sharing options...
mark corbitt Posted September 26, 2019 Author Share Posted September 26, 2019 1 hour ago, Mattkh said: Hey me too! Thought I was the only one in South Georgia on here Nope. Link to comment Share on other sites More sharing options...
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