View Full Version : rear diff info

05-07-2005, 02:37 PM
im looking for info concerning the rear differential in my 69 amx [ i.e. type , gear ratio etc ]
the car is a 390 with a 4 spd trans

Big Bad AMX
05-08-2005, 12:48 AM
Standard ratio with a four-speed is a 3.54:1 though other ratios were available. In an AMX it could be either an Open rear end (standard), Sure-Grip (optional or standard with Go-Pack option), or Locker (optional).
Check this thread for more detailed info on how to tell what ratio you have:

The rear-end is an AMC Model 20 or Dana 20 (the AMC rear end is made by Dana). For high performance use installing one-piece forged steel axles is recommended.
For more on axles: