Transmission Parts GM 200-4R 4L60 4L60-E Pump Valve / Sleeve

Symptoms:

No lockup
Falls out of lockup when hot
Fluid blown out fill tube
Lockup immediately after 2nd gear

Cause:

Excessive pump bore-to-valve clearance allows TCC signal oil to leak past the spool, preventing lockup or causing lockup to disengage when hot. Additionally, converter feed can leak past the excessive clearance, combine with signal oil and cause premature lockup.

Correction:

Sonnax drop-in TCC apply valve kit with PTFE seal will eliminate bore cross-leakage.

Warning:

This part only fits non-PWM units, and mismatching PWM and non-PWM valves will cause rapid converter failure.

Identifying PWM vs. Non-PWM Units
If the OE valve features double spools at the location indicated here, you are working on a non-PWM unit. If the OE valve features one spool, you are working on a PWM unit and must use Sonnax TCC apply valve kit 77805E-K. Do not rely on the OE valve material (steel vs. aluminum) to determine for whether the unit is non-PWM, as some early PWM pumps also used steel TCC valves.

200-4R, 4L60, 4L60-E

TCC Apply Valve Kit
Part No. 77805-K

Fits non-PWM units only.

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Vehicles with GM 200-4R, 4L60 and 4L60-E transmissions have numerous converter overheat lockup complaints. These include no lockup or lockup immediately after 2nd Gear when fluid warms up, caused by valve bore wear. Frequently, the solenoid will have no control over the valve's position. Often converter feed oil will leak past the OE spool, which, added together with orificed signal oil will be more than the solenoid can exhaust. This may completely stroke the valve into the lockup position and create a "no power" or "no brake cancel" condition. Oil cross-leaks may float the valve into a mid-way position and restrict cooler flow, which burns up the converter.

Sonnax TCC apply valve kit 77805-K will eliminate the bore cross-leakage. This precision valve has a PTFE seal to prevent the cross-leaking of converter signal and converter feed oil.

Hardened steel valve matches OE material
PTFE seal eliminates cross leaking of converter signal oil and converter feed oil
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

Contents

Seal PTFE
Valve Steel

Valve Body Layout

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.