[Dirty Harry]

I wanted my driveshaft shortened a little more and took it to a driveshaft specialty shop. I told them I wanted it re-balanced after shortening. They said that they would, but said that a shaft that short really wouldn't require it. Apparently, it's the 4-footers that develop harmonic vibrations and such. For cost and durability, I don't think you can beat steel for a 13 incher. I've had my car for 25 years and no one's ever seen my nicely painted driveshaft but me.