rainmakr95 Posted June 15, 2009 Share Posted June 15, 2009 Hi everyone! My 86 mj has developed a rod knock. I don't know which I should do. rebuild the 2.8 or install a 4.0 How much headache would it be to swap over. From what I've researched, the 2.8 is a Chevy block. Can Anyone give me some help. If anyone in New Jersey or nearby Pa. has a 2.8 let me know Thanks Bob Hartman Link to comment Share on other sites More sharing options...
Pete M Posted June 15, 2009 Share Posted June 15, 2009 It's quite an involved swap. Essentially, you'll need to gut your entire truck and swap in everything from a donor MJ/XJ including the entire wire harness, dash,, radiator mounts and hood. A more straightforward swap is to get a 3.4L chevy block from a Camaro/Firebird. It's a near bolt-in procedure. :thumbsup: http://jeep.off-road.com/jeep/article/a ... ?id=277008 Link to comment Share on other sites More sharing options...
dasbulliwagen Posted June 15, 2009 Share Posted June 15, 2009 The 3.4 will take all of your 2.8 accessories, manifolds etc, just bolt in, but I think you may have to have your 2.8 flywheel nuetrally balanced by a machine shop, as the 2.8 used it for balance, but the 3.4 doesnt. Do some research on this though, I'm pretty sure thats right. car-part.com should be able to locate an engine for you used. Good luck and keep us updated! Link to comment Share on other sites More sharing options...
rainmakr95 Posted June 15, 2009 Author Share Posted June 15, 2009 I didn't mention that I have an automatic trans. I assume it's a 904 that came with this truck. That being the case, will the flex plate bolt up or do I need a different one? Bob Hartman Link to comment Share on other sites More sharing options...
dasbulliwagen Posted June 15, 2009 Share Posted June 15, 2009 The flexplate will bolt up, but like the flywheel, you will need to have it nuetrally balanced by a machine shop. Link to comment Share on other sites More sharing options...
Tri_X_Troll Posted October 1, 2009 Share Posted October 1, 2009 What about just using the flywheel off of the donor engine? Link to comment Share on other sites More sharing options...
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