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94 to 97 4.0 engine swap

Discussion in 'Shop - Engine' started by Ian Brock, Apr 9, 2007.

  1. Ian Brock

    Ian Brock Well-Known Member

    Jan 24, 2007
    So Cal
    My step brother has a 94 Ranger with a 4.0 he blew. Now he wants to swap in a 97 4.0 from a lightly rolled ranger. Its has an 8 bolt register on the 97 compared to a six bolt on the 94. also exaust manifold smog fitting on the drivers side is in different location.
    We plan to use existing brain and loom...and just swap out all sensors from the 94 motor. Are we on the right track?

    Has anyone been through this before?
  2. bigdognathan

    bigdognathan Member

    Oct 9, 2006
    hemet, ca
    i'm no pro but i've read a lot on this subject. first off, the 97 is going to have a lot more sensors and what not due to the OBD II system that the 94 lacks. also, the brain from the 94 will not be compatible with the 97 if i'm not mistaken. you could also have issues with the clusters. the 94 cluster is different than the 97 and may not be compatible with the 97 brain either. what i would do just to be safe is get the 97 4.0 along with the wiring harness and computer. there is a reason most people sell these engines with the harness and computer.
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