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In GM 4T65-E units, continuous oscillation of the converter apply valve in the cast-aluminum bore causes bore wear, particularly at the TCC signal valve spool closest to the solenoid. Wear in this area allows TCC signal oil to leak, which inhibits the valve from stroking to the lockup position. Due to the valve body casting design and oil flow, this valve is also subject to extreme side loading, which increases the wear rate. Early OE versions of this valve were made from non-anodized aluminum, and show significant wear marks. Reconditioning the bore and installing Sonnax oversized TCC apply valve kit 84754-50K provides a positive seal and ensures proper valve stroke.
Always inspect the TCC regulated apply valve for wear. The O-ring in this kit should be used to replace the original end plug O-ring after inspection. Worn valves or bores can be repaired using the Sonnax TCC regulated apply valve and sleeve kit 84754-34K.
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KUNDENSERVICE
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HILFE & SUPPORT
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TOP AUTOMARKEN
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TOP GETRIEBE
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TOP PRODUKTE
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