The other day I was installing an axle. When I pulled the new axle out of the box, an instruction sheet was present. I opened it up, flipped through it, and found an interesting noise/ vibration chart for drive line problems. Complaints, or problems, are across the top row, and possible causes are listed down the left hand column.

noise complaint chart
(click to see full size image)
This chart is interesting, accurate and a helpful place to start diagnosing drive line noise or vibration complaints. None of the information is earth shattering, but it is handy to have in a chart. More importantly, the lesson learned here is that regardless of how many times you have made a repair, if there are instructions with your replacement part, take the time to read though them, you never know what you might come across.