Product Details

Sonnax main boost valve and sleeve

Part number: 94987-09K

For the 450-43LE, AW450-43LE, Aisin AW, Aisin Seiki, Aisin-Warner transmission

1998-later models

The 94987-09K boost valve assembly is designed to increase line pressure in Drive and Reverse. When the AW450-43LE sleeve is worn on the inside or loose within the valve body, boost or EPC fluids can leak to exhaust or cross leak and increase forces on the valve. Leakage to exhaust reduces line rise, while the cross leaks can result in broken clutch drums or cases. Sonnax main boost valve and sleeve kit 94987-09K has upgraded materials to prevent wear and restore proper hydraulic control.

• Sleeve is manufactured from highly wear-resistant billet aluminum
• Aluminum valve has been hard-coat anodized to reduce wear
• Restores proper hydraulic sealing and OE pressure control
• No special tools required

Vehicle applications: This Sonnax boost valve works in the following Chevrolet, GM, GMC, Isuzu, Mitsubishi Fuso, and Nissan UD applications.

Chevrolet

• W3500 Tiltmaster, I4 diesel, 1999-2007*
• W4500 Tiltmaster, I4 diesel, 2002-2007
• W5500 Tiltmaster, I4 diesel, 2000-2007
• W5500HD Tiltmaster, I4 diesel, 2004-2007

GMC

• W3500 Forward, I4 diesel, 1999-2007*
• W4500 Forward, I4 diesel, 1999-2007*
• W5500 Forward, I4 diesel, 2000-2007
• W5500HD Forward, I4 diesel, 2004-2007

Isuzu

• NPR, I4 diesel, 1999-2007
• NPR HD, I4 diesel, 1999-2007

Mitsubishi Fuso

• FE, I4 diesel, 1999-2004*
• FE-HD, I4 diesel, 1999-2004*
• FE-SP, I4 diesel, 1999-2004*
• FG, I4 diesel, 1999-2004*
• FE120, I4 diesel, 2005-2007
• FE145, I4 diesel, 2005-2007
• FE145CC, I4 diesel, 2005-2007
• FE180, I4 diesel, 2005-2007
• FG140, I4 diesel, 2005-2007

Nissan UD

• 1200, I4 diesel, 1999-2004
• 1300, I4 diesel, 2005-2007
• 1400, I4 diesel, 1999-2007*

*The 450-43LE transmission started in 1998, but was a cross-over year. This application could have the listed transmission, starting in 1998. If you are unsure about a 1998 model, please contact us for help.

These transmissions are known by multiple names and codes, including: 450-43LE, AW450-43LE, Aisin AW, Aisin Seiki, Aisin-Warner