At the plant tour a few years back, we asked about the discs that some of the schoolbus chassis were getting. He said they started putting them on early in the decade, and now they're up to at least 50% of the trucks. In Use: 70 1210 4x4 TE, 73 1210 WM Project (2nd time) 67 1000B PU Parts: 67 1000B TA 68 1100 4x4 TA 72 1010 TA