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  • CPC codes
  • Bump shifts
  • Harsh shifts
  • Bind-up
  • Burnt clutches
  • Downshift clunk
  • Flare shifts
  • Overheated fluid


Bore wear at compensator feed regulator valve allows critical pressure loss that prevents proper clutch timing and control.


Recover hydraulic control and renew shift performance by installing Sonnax compensator feed regulator valve kit.

6L45, 6L50, 6L80, 6L90, 6T40 (Gen. 1), 6T45 (Gen.1), 6T50 (Gen. 1)

Compensator Feed Regulator Valve Kit
Part No. 104740-09K

You need this if... View Instructions

Listed GM transmissions incorporate a low-pressure compensator feed circuit to assist clutch return springs during release of rotating clutches. After clutches disengage, the compensator feed circuit maintains pressure in the clutch release cavity to oppose centrifugal application of the clutches. Control over this process resides with the compensator feed regulator valve. When the bore wears, correct valve operation is hindered, causing clutch apply timing issues such as harsh shifting, flares, and bump shifts. In addition, overheated fluid and burned clutches can result. Installing Sonnax compensator feed regulator valve kit 104740-09K restores normal compensator action for revived shift characteristics in all ranges.

  • Hardcoat anodized aluminum valve combats premature wear
  • Highly wear-resistant aluminum sleeve provides additional valve support
  • Includes calibrated spring for restoring OE compensator pressure
  • Valve
  • Sleeve
  • Spring
  • Retaining Clip

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.

GM 6T40 (Gen. 1), 6T45 (Gen.1), 6T50 (Gen.1) Valve Body Layout

Gm 6t40 gen1 vbl thumb

November 07, 2014

GM Compensator Feed System

Brian Wing

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August 21, 2013

GM 6L45-6L90 Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission GM 6L90 Transmission 6L80 Transmission 6L50 Transmission 6L45 Transmission

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October 31, 2014

GM 1st Gen. 6T40, 6T45, 6T50 Vacuum Test Guide

Topics: Vacuum Test Guides Vacuum Testing Transmission GM 6T45 (Gen.1) Transmission 6T50 (Gen. 1) Transmission 6T40 (Gen. 1) Transmission

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  • 104740 09k  1
  • 104740 09k
  • 104740 09k 6l80 combo

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

  • 104740 09k in 6t40 vac
  • 104740 09k in 6l80 test