What is so much better about a upside down modified volvo AC fan, then a new bolt on? Not to mention that a late 80's fan is what 20 years old who knows it could burn up in 6 months. No not rocket science for sure but putting a 20 year old fan on a truck is not the smartest thing to do in this situation either. Unless it is just a better product. You would think the people that made these aftermarket fans would put more research into what they are selling.