Join Date: Sep 2000
Location: Washington, Michigan USA
I dunno - maybe some did, some didn't; although it shows in the A.I.M. in the G80 Section (Positraction axle), it doesn't show the specific usage where it's required (which ratio, etc.) except for one L34/M40 application that requires a different adapter than the other two shown. All I know for sure is that mine is an original factory 4.10 (have the documentation), has never been touched since it was built, and it didn't have one. If someone knows the specific applications that required it, that would help answer the question. As I said, I've never seen one on a '69 Z/28, but I've never seen a factory-installed 4.56, either.
'69 Z28 Fathom Green