Great feedback, folks. Thank you. To clarify, I did install the short shaft water pump from Jim Carter when I did the engine back in '04 or so and had to use the flat back fan from a 216 because the 235 fan won't clear the radiator. Unfortunately, that water pump also put the fan out of center on the radiator so it is centered in the bottom 3rd which is probably causing the overheating problem. I can't move the radiator down to center it. (Have a photo, but can't figure out how to attach it here. It's been too long since I posted a photo I guess). I am inclined to try replacing the rear end and keep the 235 after reading your replies. It has the stock 4.57 gears and granny 1st gear. What would be the best and easiest swap for the rear end and would it keep the 8-lug wheels? I am a little nervous about running the radials Les Schwab sold me on a 2-piece rim, but they said they would be fine. And would a swap to a better gear ratio involve doing anything to the transmission? The truck has an enclosed driveline. Thanks again for the ideas folks.
