Power train
Mack technical service bulletin S4558 202506 for 2021-2024 Mack Pinnacle (Pi/PN).
- Bulletin number
- S4558 202506
- Component
- Power train
- Summary
- Mack trucks has determined that certain model year 2021-2024 PI models built with 4.19 rear axle ratios could experience elevated axle oil temps under high road speeds. To correct this issue the 4.19 ratio carriers need to be swapped to 3.79 ratio carriers. Follow the instructions below to replace both carriers with new ones.
Vehicles covered
- Mack Pinnacle (Pi/PN) 2021-2024 2021202220232024
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