Are all 4.0 blacks the same?
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Joined: Nov 2009
Posts: 224
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From: Provo UT
Year: 89 2 door
Model: Cherokee
Engine: 4.0
the blocks had minor changes in casting materials. different strengths etc. i believe some of the thread bosses were added or subtracted too. but the structure remains the same i believe. i would call your local machine shop to be sure though.
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