Differential Assembly: Application and ID

REAR AXLE IDENTIFICATION DESCRIPTION
These trucks use various rear axles. The axles can be identified by ring gear size in inches, by manufacture (American Axle Manufacturing or Dana) and by the type of axle shaft used (semi-floating or full-floating). AAM axles include the 8 1/2, 8 5/8, 9 1/2, and 10 1/2 inch ring gear axles. Dana supplies an 11 inch ring-gear axle. The locking differential is supplied by Eaton

BROADCAST CODE






All rear axles are identified by a broadcast code on the right axle tube near the carrier. The rear axle identification and manufacturer's codes must be known before attempting to adjust or to repair axle shafts or the rear axle case assembly. Rear axle ratio, differential type, manufacturer, and build date information is stamped on the right axle tube on the forward side.
- The first three characters (1) indicate the rear axle ratio.
- The next character (2) indicates the axle assembly build source code.
- C = Buffalo
- K = Canada
- The next three characters (3) indicate the day built, displayed in Julian Date form.
- The last character (4) indicates the shift.
- 1 = First
- 2 = Second
In order to verify reports made on rear axle assemblies, include full code letters and build date numbers.
Refer to Maintenance for periodic maintenance and lubrication intervals.