I was driving to work on [XXX] when my rear end locked up and I slid sideways down [XXX]. I was going slower than normal due to slippery road conditions. The mechanic told me it was the pinion nut that froze up and locked up the gears and snapped the drive shaft. If it had been clear roads the truck probably would have flipped over. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)