You need to measure over 4 track links, 5 pins with track stretched to measure track wear. There are charts on the net to determine percentage of track life left. Or ask your dealer, they have the charts. Pads mean little. That being said I am not afraid of old iron, but then I just play. Many old machines suffer final drive issues when the pads are built up. I would rather spin than break. If it does your job, you will come out well, If it fails, you are out some dough. Are you experienced in operating and maintaining these older machines? They will eat the uneducated in items you did not know enough about to maintain. If you get it, buy a set of manuals and read them. They will be the cheapest thing you ever buy for it.