4.2 to 4.0

from memory only, the flywheels are interchangeable. If swaping in a 4.0, you'll need the 4.0 flywheel for it's CPS, unless you are using an aftermarket FI system.
 
i can tell you that a flywheel from a yj that had a 4.0 in it fit my 4.2 when i had it....so i guess it would go the same way.....but Chris_M is right....you would need the cps for the fuel injection......what tranny do you have behind your 4.2? if its the peugot 5 speed....might as well go ahead and swap in a ax15....trust me lol
 
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