I put a 2014 5.7 into a 2009 Ram 1500. I had to use the flywheel from the 2009 but everything else worked. I have power and it will crank but won't fire. Someone told me I need to have the computer remapped, is this the case?

 

Moved to the correct section.

 

Shouldn't have to, should be identical engine UNLESS they pulled a fast one and changed the crank tone wheel tooth count. Need to verify that between your old and new engine.

Not quite, 09 and 14 are 4th gens.

 

Think I got it now.....