jimoshel Posted March 28, 2010 Share Posted March 28, 2010 I have a 2001 XJ with 4.0,Auto and 4WD. I originally got it with the intention of swapping everything into a 1989 MJ 4.0, 5sp, 4WD. After wising up to what all was involved I;m just going to swap engines. I'm going to remove all the sensors, everything associated with the HO and replace them with Renix. I believe I will be losing a couple HP doing this but I will still have a fresher engine. Going to keep the AX15 and swap the flywheel,over to the newer engine. Hope I don't have to change manifolds also but will if necessary. Any thing I'm overlooking? Jim Learn as if your going to live forever. Live as if your going to die tomorrow. Link to comment Share on other sites More sharing options...
Eagle Posted March 28, 2010 Share Posted March 28, 2010 The 2001 block may not have a boss for the knock sensor. If it does, I don't think it will be tapped for it. Check the number on the head casting. It was around 2000 that Jeep started using a head that has a reputation for cracking. There was a recent thread here in which someone provided the casting number to watch out for. Link to comment Share on other sites More sharing options...
Yesterday's Danish Posted March 28, 2010 Share Posted March 28, 2010 The casting number is 0331. The head usually cracks between cylinders 3 and 4. Link to comment Share on other sites More sharing options...
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