Aisin Seiki AW450-43LE Forward Planet Angled Cut Gears with Low Sprag
The Aisin Seiki AW450-43LE transmission, featuring angled cut gears and a low sprag in its forward planet, primarily fits Isuzu NPR/NPR HD (1999-2007), GM W-Series (W3500, W4500, W5500 Forward/Tiltmaster 1999-2007), Mitsubishi Fuso FE series (1999-2004/2005-2007), and Nissan UD 1200/1300/1400 (1999-2007), commonly in Isuzu diesel-powered light/medium-duty commercial trucks, with specific year applicability depending on the make and model. The angled-cut planetary gear set is a key identifier for this specific internal component within the robust 450-43LE unit.
Key Vehicle Applications:
- Isuzu: NPR, NPR HD (1999-2007).
- GMC/Chevrolet: W3500, W4500, W5500 Forward/Tiltmaster (1999-2007).
- Mitsubishi Fuso: FE, FE-HD, FE-SP, FG (1999-2004) and FE120, FE145, FE180 (2005-2007).
- Nissan UD: 1200, 1400 (1999-2007) and 1300 (2005-2007).
Key Identifier:
- The specific forward planet with angled cut gears and a low sprag distinguishes it within the AW450-43LE family, differentiating it from other versions (like straight-cut gears) used in similar applications.
Important Note:
- When sourcing parts, always verify compatibility by matching the transmission’s original part numbers or consulting with a specialist, especially for crossover years like 1998, as variations exist.

















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