I pulled out my original 4.0 after I found pieces of the #3 piston skirt in the oil pan. I bought a reman 4.0 and am having a heck of a time getting the new motor to slide into the bellhousing properly. I did not remove the transmission when I removed the engine and this is my first time attempting something like this. I put on a new clutch and pressure plate and lined it all up with the alignment tool but I can't get the engine to slide on the transmission shift far enough to bolt it up. What am I missing here?