the 318 was just put in last year with supposable 77000 miles on it. long story behind this car. my sister had it, was a 340 but brother inlaw spin a crank bearing. he kept the 340 for another project. so the story goes, he say's the 318 has the 340 flex plate and torque converter on it. I have wondered if that makes the engine unbalanced because it feels like the driveshaft vibrated over 60mph. hence the tranny leak. I have been mulling the fact that the torque converter may be the entire issue with the engine also.