It has the 4.3l v6. Missing placement blocks whatever that means. From what I was told it is riding on leaf springs. Someone must have tried lowering the truck or something. There is just no placement in the rear end at all. Dont know what consist of rear end placement or what to buy. The rear end is just all over the place. Dangerous to drive have to fix it immediately. Also when i had the truck in the air and was tugging on the lug nuts to take the tire off. The rear tire was literally bending in as I tugged. Theres just no placement.