General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

99 4.0 engine swap

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Old Jan 28, 2025
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Bownuts's Avatar
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From: CENTRAL POINT, OREGON
99 4.0 engine swap

I have a 99 ranger xlt 4x4 stepside that is getting its 4.0 replaced. The dohner truck is also a 99 xlt 4x4 with a 4.0 but a fleetside with power windows.
Can I use the ECM that is currently in my stepside or do I need to swap the ECM and wire harness?
 
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Old Jul 20, 2025
  #2  
MazRanger's Avatar
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Joined: Mar 2021
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From: Calgary, AB, Canada
Originally Posted by Bownuts
I have a 99 ranger xlt 4x4 stepside that is getting its 4.0 replaced. The dohner truck is also a 99 xlt 4x4 with a 4.0 but a fleetside with power windows.
Can I use the ECM that is currently in my stepside or do I need to swap the ECM and wire harness?
I found that you must use one form the same type of transmission. I have a manual 5 speed and when I tried to use an ECM from an automatic they did not want to talk to each other.
 
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