This was my first truck, a '77 D-100, it spent most of it's life on a farm, all it ever did was haul hay. It was originally a 318 3 on the tree. The 318 finally gave up after 310-ish thousand miles. So I found a 74 440 to shove in there. Of course, much to the disapproval to my boss and anyone I tell, I am keeping the A-230 behind the 440 because A, a three on the tree big block half ton is slick and B, the transmission was rebuilt right before I bought it, no point in letting it go to waste.