Stamping code letters started about 1970. Before that it was a tooth count. 40 ÷ 13 = 3.0769... which rounds up to 3.08. 3.08 is a 6 cylinder size AMC model 15 diff. The equivalent model 20 would be 43/14 for 3.07:1 Ken Quoting Joe Fulton <piper_pa20@xxxxxxxxxxx>: > Chad, > > Your car has a 3.07 to 1 axle ratio. That's sort of an in-between gear: > highway friendly but still able to deliver some torque to the rear wheels. > > > If you have a tag, your car probably has the AMC 15 rear, right? Normally, > the > AMC rears had an alphabetic code stamped into the housing boss near the > passenger side axle tube (at the rear). Joe > > > > ----- Original Message ---- > From: "chadchadwick@xxxxxxxx" <chadchadwick@xxxxxxxx> > To: amc-list@xxxxxxxxxxxxxxxxx > Sent: Tue, January 25, 2011 12:31:59 PM > Subject: [AMC-list] Differential number > > Joe I checked the defferential housing on my javelin and i could'ent find a > > number, but the tag is still there it reads 13/40 does that help. chad > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://list.amc-list.com/pipermail/amc-list-amc-list.com/attachments/20110125/386a664b/attachment.htm> > > _______________________________________________ > 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 > _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com