I don't know much about the exact makeup of the unit itself so I'm gonna need some help here. For those of you who don't remember, I'm eating alt v belts on my 84 6.2 diesel. I just can't figure it out. Well, I'm about to go through my 4th in as many months(this has lasted the longest), but I have a question. I'm replacing the head gaskets on my other car, so naturally, the alt came off. It's a 1992 Ford alt for serpantine belt. When I grab the pulley, there is no play at all, lateral or otherwise. it is tight and spins freely. When I grab the pulley of my truck alt, I can feel a bit of "free" movement. You can't see it, you can't hear it, but you can just feel it. Could that mean the truck alt is going bad(I have no idea how many miles are on it) or is this just a bad comparison? The truck's insatiable appetite for alt belts has to stop.