I bought a 92 ford ranger with no motor or trans. It origionaly had the 4.0 V6, AT in it. I have a 2.9 motor and trans out of an 87 ranger im going to try to put in it. I am wondering if there is anything i have to change to make the 2.9 to work in it or if it drops in and will work. thanks jackson

 

The 2.9 and the 4.0 are siblings with just different bore/stroke. The 2.9has a3.7 inchbore and a 2.8 inch stroke while the 4.0 has a 3.95 inch bore and a 3.32 inch stroke. If using the same type of tranny (auto or manual) then it seems that everything should be PLUG-N-PLAY. The CPU may need to be changed if there is a measurable difference in the duration of injector pulse for the 4.0 verses the 2.9. This is just basic info to help you get started.