Posted by apb in NY on Tuesday, October 31, 2006 at 1:38PM :
In Reply to: I saw some type of PTO on a truck today. posted by Haven't seen one like that before. on Tuesday, October 31, 2006 at 10:21AM :
No you didn't.
Look at the front axle, and you'll see the same thing. The Rockwell axles are designed to be universally exchangeable as a field expedient.
What you saw was the pinion flange.
Here's a page from my website. Click on the bottom photo. It shows a disc brake attached there as an assist to the drums.