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