See these write ups:
http://www.wichitamopar.com/wp-content/uploads/2012/10/ MOPAR-REAR-DIFFERENTIAL- INFORMATION.pdf
http://www.mopar1.us/875.html
Gary H.
> -------Original Message-------
>
> Thanks, I appreciate that info. .. The question came up today--when
> did the 489 differential come into use, and what on? And, weren't all
> of those the cone type sure lock? ...........................MO
>