Symptoms:

  • Code P0218
  • Code P0741
  • Overheated converter
  • Inadequate lubrication
  • Excess converter pressure
  • High TCC slip RPM

Cause:

Converter feed limit bore wear or stuck converter feed limit valve can result in overheat, incorrect TCC apply/release, inadequate lube and cooling and other problems.

Correction:

Recover hydraulic control and renew TCC and lube performance by installing the Sonnax drop-in converter feed limit valve kit.

8L45, 8L90

Converter Feed Limit Valve Kit
Part No. 154740-19K


You need this if... View Instructions Find a Distributor

GM 8L45 and 8L90 units may have TCC apply and release problems. Bore wear or a stuck converter feed limit valve can result in converter overheat, incorrect TCC apply or release, inadequate lube and cooling and converter over-pressurization. Installing Sonnax drop-in converter feed limit valve kit 154740-19K will restore proper valve function, resulting in proper TCC apply and release, regaining control of lube and cooling.

  • Hardcoat anodized aluminum valve combats premature wear
  • Annular groove helps center the valve in sleeve
  • Sleeve adds valve support to resist wear
  • Drop-in Zip Valve parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs

OE vacuum testing at the inboard spool requires converter feed limit vacuum test tool 154740-TL22.

  • Sleeve
  • Valve
  • Spring
  • 8L45, 8L90 Converter Feed Limit Valve Kit 154740-19K
  • 8L45, 8L90 Converter Feed Limit Valve Kit 154740-19K

You need this if...

Inboard Location: Install Sonnax converter feed limit vacuum test tool 154740-TL22 with vacuum testing tube attached to long end (Figure 3). Vacuum should hold a minimum of 18 in-Hg (Figures 1 & 3).

Outboard Location: Insert either the OE valve or Sonnax converter feed limit vacuum test tool 154740-TL22 centered in the port (Figure 2). Vacuum at indicated port should hold a minimum of 15 in-Hg (Figures 1, 2 & 3).

8L45, 8L90 Converter Feed Limit Valve Kit Vacuum Test Locations