Ah yeah, that could have been catastrophic! Good thing you caught it.i think when i was messing with the exhaust a few years ago i forgot to mount part off the muffler hangers and part of the mufflers edge was digging into my drive shaft. it off ballance. The other day i went o go mess with my P0446 code and noticed a inch long crack in the drive shaft. But Tuesday i found a drive shaft on ebay for 150$. only thing i didnt like on it were the U-joints. so i bought 2 MOOG joints with the greese zerks in them so ill just replace them and clean up the shaft.