Originally Posted by Turbovsix
Primo - you are the man. Thanks for that heads up.
My build date is 4/10 so I guess I'm out of range. I actually wish it was in range because I'm not sure what the major difference was just in a four month span?
I am guessing
Manufacturers have multiple suppliers for any part. For example, if XYZ had a strike and caused a supply problem, the manufacturer would be seriously affected.
It's possible that the affected pinion nuts were supplied by a specific supplier. A retainer is easier to install, and reduces the possibility of changing the pinion depth when the pinion nut is re-tightened.