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RPO codes 1st character : H
| H01 | AXLE REAR, 3.07 RATIO |
| H04 | AXLE REAR, 4.11 RATIO, SINGLE SPEED |
| H05 | AXLE REAR, 3.73 RATIO |
| H12 | AXLE REAR, 21000 LBS, EATON 21065S, SINGLE SPEED |
| HA3 | AXLE REAR, 5.29 RATIO, SINGLE SPEED |
| HC4 | AXLE REAR, 4.56 RATIO |
| HC7 | AXLE REAR, 5.13 RATIO, 7500 LBS, SINGLE SPEED |
| HC8 | AXLE REAR, 3.21 RATIO, SINGLE SPEED, TRUCK |
| HE3 | AXLE REAR, 3.07 RATIO, 3500 LBS, SINGLE SPEED, |
| HF7 | AXLE REAR, 4.56 RATIO, 10000 LBS, DANA 70, SINGLE |
| HF8 | AXLE REAR, 4.88 RATIO |
| HK1 | AXLE REAR, 2.87 RATIO |
| HK9 | AXLE REAR, 5.86 RATIO 10000 LBS, SINGLE SPEED |
| HOT | APPEARANCE PACKAGE GMC “HOT TRUCK” |
| HPR | HEADLAMPS, DUAL, RECTANGULAR |
