I dont know if the full size are cheaper around here.I havent seen may 3.9 fullsize around here but I also havent looked for a 94 up truck either. That needs further looking into Thanks If the 3.9 has the same oil pump as the 5.2 I think we could modify the 3.9 pan with a car pan tht will fit the 62 better. Like Ive said though. I havent looked at the slant in there to see what it could or might need done. Might not have to do anything.