Product Details

Sonnax AW450-43LE cutback valve and sleeve

Part number: 94987-01K

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

1998-later models

The stock cast-aluminum cutback valve sleeve breaks at the retainer area due to sleeve porosity and the retainer cocking in the bore and exerting excessive force on the thinnest part of the sleeve. This allows the valve and sleeve to move out of position and can create engine stalls when put in gear. It also allows the lockup control valve to move out of position, which can create converter apply issues. Broken pieces of the sleeve can end up in the pan, break into smaller pieces and clog filters or lodge in moving components. The Sonnax billet aluminum cutback valve and sleeve kit 94987-01K provides higher tensile strength and reduced porosity to resist breakage.

• Prevents engine stalls
• Billet aluminum sleeve provides higher tensile strength and eliminates breakage.
• Improved valve and sleeve materials prevent wear and provide better sealing capacity through temperature changes.
• A replacement spring included to maintain OE calibration
• Sleeve is manufactured from highly wear-resistant billet aluminum
• 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