Aisin Seiki AW450-43LE Forward Clutch Drum (58 Tooth PTO Gear) 1998-2007

Aisin Seiki AW450-43LE Forward Clutch Drum (58 Tooth PTO Gear) 1998–2007

The Aisin Seiki AW450-43LE Forward Clutch Drum with 58 Tooth PTO Gear is a critical rotating component inside the Aisin Seiki AW450-43LE transmission used in medium-duty commercial trucks from 1998 through 2007. This drum houses the forward clutch pack and integrates a 58-tooth PTO drive gear, which supports power take-off functionality for vocational and utility applications. Because the forward clutch controls initial gear engagement and torque transfer, this drum directly impacts shift quality and drivetrain performance.

Over time, heavy loads, heat cycles, and constant PTO use can wear clutch splines, distort the drum, or damage the integrated gear teeth. As a result, the transmission may slip in forward gears, shift harshly, or produce abnormal drivetrain noise. However, replacing a worn forward clutch drum restores proper clutch alignment and consistent torque delivery. Consequently, the transmission shifts smoothly and maintains reliable operation under demanding commercial conditions.

This AW450-43LE forward drum with 58-tooth PTO gear meets OEM specifications for strength, balance, and gear precision. Therefore, it withstands high torque loads while maintaining accurate clutch engagement. Additionally, installing a quality drum during a rebuild helps protect related components such as clutch packs, planetary assemblies, and pump systems from premature wear.

Always verify the transmission model, PTO configuration, and tooth count before ordering. Proper confirmation ensures correct fitment and prevents costly downtime. For best results, inspect the pump assembly, overdrive planet set, and valve body during service. You can also browse our selection of AW450-43LE rebuild kits, clutch packs, and hard parts to complete your overhaul.

Below is the link to our other AW450-43LE Transmission parts in stock!

AW450-43LE Transmission Parts.

For installation procedures and torque specifications, consult the official vehicle service manual or a trusted transmission technical resource.

Below is the link to the AW450-43LE Transmission Diagram for reference!

AW450-43LE Transmission Diagram

Vehicle Compatibility

This part fits medium-duty commercial trucks equipped with the Aisin Seiki AW450-43LE transmission from 1998 through 2007.

Common applications include:

Isuzu NPR (Gas & Diesel)

Isuzu NPR-HD

Isuzu NQR

Chevrolet W-Series

GMC W-Series