April 21, 2021
Symptoms:
- Excess converter pressure
- High TCC slip RPM
- Code P0218
- Code P0741
- Overheated converter
- Inadequate lubrication
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 reconditioning the bore and installing Sonnax oversized converter feed limit valve kit.8L45, 8L90
Oversized Converter Feed Limit Valve Kit
Part No. 154740-22K
-
Requires:
- F-154740-TL22
- 154740-TL22 (Recommended)
- VB-FIX
You need this if... View Instructions Find a Distributor
GM 8L45 and 8L90 transmissions 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. Reaming the bore and installing the Sonnax oversized converter feed limit valve kit 154740-22K 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 bore
OE vacuum testing at the inboard spool requires Sonnax converter feed limit valve vacuum test tool 154740-TL22.
- Valve
- Spring
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.
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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).
