Hello all! In my previous post concerning engine vibration, diesel4me mentioned that my fan blade could be bent causing the vibration. Well, I visually checked my fan blade and it appears to have a wobble. I am going to remove the fan belt a see if the vibration goes away. In the event that it does, I am considering replacing the radiator and installing an electric fan with shroud. I have a 1973 K10 with a 350 engine and a manual transmission. It currently has a 3 core radiator however it sits below the level of the radiator support. One of my co-workers has a 1978 K10 that has an automatic transmission. He currently has a 350 in it; however he said it originally had a 400. I noticed that his radiator sits flush with the top of his radiator support. My questions to you all are; what radiator will fit my application and witch fan assembly would you recommend? Any and all help would be much appreciated! Thank you!