Has anyone out there used an aftermarket fan on an advanced design pickup with a 235 in it? I have heard about using a fan from a task force truck with the 235, but those fans are hard to come by around here. Also, I bought a fan from one of the vendors and it did not move enough air to keep the engine cool. I was thinking about using one of the "flex" fans from a local parts store and wondered if anyone had any experience with those specifically in regards to fan/radiator clearance since the spacing is so tight with the 235. Thanks in advance for your help!