Posted by Tim Way on Sunday, May 15, 2005 at 8:43PM :
In Reply to: What is it? posted by Paul O'Reilly on Sunday, May 15, 2005 at 7:34PM :
Does it look like the pictures at his link?
http://www.garbee.net/~cabell/photos32.htm
If so, it's a driveshaft de-clutch unit from a contact maintenance truck. If not, your guess is as good as mine :-)