I would like to upgrade my 3.0 to a 4.0 I can get a rebuilt engine pretty cheap bu what else would I have to change and would it be worth the cost and time investment

 

for what you put onto changing from 3.0 to a 4.0, you could have a 5.0.

your going to have to get the computer and the wiring harness and i dont think a 4.0 will bolt to a 3.0 tranny but im not sure. idk about the motor mounts or the exhaust

 

Motor, trans,wiring,ecu

 

X2