Axle Ratio & Identification Code
Rear axle ratio, differential type, manufacturer, and build date information is stamped on forward side of right axle tube. Service parts identification label will have Regular Production Option (RPO) codes for rear axle identification. See Fig 1.
See AXLE RATIO IDENTIFICATION table.
AXLE RATIO IDENTIFICATION
| Application | Teeth Ring Gear/Pinion | RPO Code | Axle Code | |
|---|---|---|---|---|
| 7 5/8" Ring Gear | ||||
| 2.73:1 | 41/15 | GU2 | 2GA & 2GB | |
| 3.23:1 | 42/13 | GU5 | 9HM | |
| 3.42:1 | 41/12 | GU6 | - | |