I don't know if this thread already exist but I have a 04 ford f150 4x4 and I was wanting to put a 4bt isb 3.9 cummins in it but I have so many questions. Like what should I expect for the total cost ? Mechanic ,engine, transfer case ect. And what kind of power and gas milage would I get compared to my 5.4 triton . If anyone can answer my questions I would appritate it

 

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