'W' is the 2.56:1 ratio. 1979 only for the model 20 IIRC. The spring perches may be different for the iso-clamps compared to non-iso. Ken Quoting Jim Blair <carnuck@xxxxxxxxxxx>: > > The M20 I have from a '77 AMX has a W stamped on the boss. I can't recall the > page where those were listed > > > > Jim Blair, Lynnwood, WA '87 Comanche, '83 Jeep J10, '84 Jeep J10 > > _______________________________________________ > AMC-list mailing list > AMC-list@xxxxxxxxxxxxxxxxx > http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com > _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com