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Symptoms:
  • Broken sleeve
  • Engine stall on engagement
  • Low boost pressure
  • Low line pressure
  • TCC apply concerns
Cause:

The cast-aluminum 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.

Correction:

The billet aluminum sleeve provides higher tensile strength and reduced porosity to resist breakage.

450-43LE

Cutback Valve Kit

Part No.

94987-01K

Cutback Valve Kit
  • 94987-01k_combo

  • Cutback Valve Kit

Small_94987-01k_combo Small_94987-01k

450-43LE

Cutback Valve Kit

Part No. 94987-01K

  • Sleeve
  • Spring
  • Valve

This kit fits '98-later models: Isuzu NPR, GMC Forward Tiltmaster, Chevrolet Forward, Nissan UD and Mitsubishi Fuso Trucks.

Complaint:

  • Broken sleeve
  • Engine stall on engagement
  • Low boost pressure
  • Low line pressure
  • TCC apply concerns

Cause:

The cast-aluminum 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.


Correction:

The billet aluminum sleeve provides higher tensile strength and reduced porosity to resist breakage.

The 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.

  • 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 has also been provided, to maintain OE calibration.

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Valve Body Layouts

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Valve Body Layout Aisin AW 450-43LE
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