| Standard Hours | Manufacturer Warranty Hours | Skill Level | Notes |
| Reseal | 3.4 | 0.0 | B | |
| NOTE |
| With Skid Plate, Add | 0.4 | 0.1 | B | |
| Replace |
| NP231 Non-Synchro, NV231 |
| Complete Assembly Without Transfer Of Parts | 1.4 | 0.9 | B | |
| NOTE |
| With Skid Plate, Add | 0.4 | 0.2 | B | |
| Complete Assembly With Transfer Of Parts | 1.4 | 1.0 | B | Includes: R&I Transfer Case. |
| NOTE |
| With Skid Plate, Add | 0.4 | 0.2 | B | |
| NP241 |
| Complete Assembly Without Transfer Of Parts | 1.4 | 0.9 | B | |
| NOTE |
| With Skid Plate, Add | 0.4 | 0.2 | B | |
| Complete Assembly With Transfer Of Parts | 1.4 | 1.0 | B | Includes: R&I Transfer Case. |
| NOTE |
| With Skid Plate, Add | 0.4 | 0.2 | B | |
| Overhaul/Rebuild |
| NP231 Non-Synchro, NV231 | 5.2 | 3.5 | A | Includes: R&I Transfer Case. |
| NOTE |
| With Skid Plate, Add | 0.4 | 0.2 | A | |
| NP241 | 5.2 | 3.5 | A | Includes: R&I Transfer Case. |
| NOTE |
| With Skid Plate, Add | 0.4 | 0.2 | A | |