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Average Score
Average Score
The PACCAR TX-12's shift logic is refined and well-matched to PACCAR MX engines. Shifts are smooth and well-timed. The Eaton Fuller Advantage is also smooth but the PACCAR's integrated development advantage shows in the engine-transmission calibration.
The TX-12's co-development with PACCAR's engine team allows for optimized shift points that extract maximum fuel economy. Eaton's programming is capable but the TX-12's home-team advantage with PACCAR engines produces measurably better MPG.
Eaton Fuller has the largest service network in North America for transmission repair. Finding a qualified technician is easier. PACCAR TX service is growing but limited to the PACCAR dealer network.
Eaton transmissions are available in trucks from every major manufacturer. This universal compatibility matters for mixed fleets and makes Eaton the standard for non-PACCAR trucks. The TX-12 is exclusive to Kenworth and Peterbilt.
PACCAR's vertically integrated warranty covers engine and transmission under one roof, simplifying claims. Eaton's warranty is comprehensive but resolving issues may involve coordination between the engine and transmission manufacturers.
| Category | Eaton Fuller Advantage | PACCAR TX-12 | Leader |
|---|---|---|---|
| Shift Quality | 85 | 88 | PACCAR TX-12 |
| Fuel Economy | 82 | 86 | PACCAR TX-12 |
| Maintenance Cost | 82 | 80 | Eaton Fuller Advantage |
| Multi-Brand Compatibility | 92 | 55 | Eaton Fuller Advantage |
| Warranty Coverage | 82 | 88 | PACCAR TX-12 |
| Overall Average | 85 | 79 | Eaton Fuller Advantage |
The PACCAR TX-12 wins in Kenworth and Peterbilt trucks where its integrated development advantage with PACCAR MX engines produces the best shift quality and fuel economy. The single-manufacturer warranty simplifies ownership.
Eaton Fuller Advantage wins for universal compatibility and service network breadth. In non-PACCAR trucks, Eaton is the standard and often the only choice. Their service network ensures you can find transmission help anywhere.
In a Peterbilt or Kenworth: choose the TX-12. In any other truck: Eaton Fuller is the proven standard.
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Published March 25, 2026