I do remember a TSB on shimming the crank sensor to stop it from hitting the flywheel. But I dont remember if it applies to your truck. You have to fix it no matter if it hits with the right sensor in there. Just shim it some and it should work fine. If you were reading 2.4 volts on the 5 volt signal wire then that does sound like a bad crank sensor as was said it should be 5 or 0 volts. Sounds like the crank sensor was shorting to ground some internally. Good luck with it , Ron