77805-K, 77805E-K
No
lock-up condition, code 1870
• Falling out of lockup when hot • Fluid blown out fill tube • Lockup immediately after 2nd gear
Excessive pump bore-to-valve clearance.
These improved TCC apply valves with Teflon® seals will eliminate bore cross leakage.
TCC Apply Valves
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Vehicles with a 4L60 or 4L60-E transmission have numerous converter overheat and lockup complaints related to valve bore wear. These include no lockup or lockup immediately after 2nd gear when fluid warms up. Frequently the solenoid will have no control over the valve’s position. These complaints are usually created by excessive pump bore-to-valve clearance. Often, converter feed oil will leak past the OEM 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 midway position and restrict cooler flow, which burns up the converter. Sonnax has developed a TCC apply valve 77805-K for the 700-R4, 200-4R and 4L60-E non-PWM units, and 77805E-K for the 4L60-E PWM units, that eliminate bore cross leakage.
- TCC apply valve for 4L60 & E non-PWM units is made from hardened steel to match the OEM material.
- TCC apply valve for 4L60-E PWM units is made from hard-coat anodized aluminum for better wear resistance.
- Precision valves have a Teflon® seal to eliminate cross leaking of converter signal oil and converter
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$75 in pump cover replacement costs |
To view a product information sheet click here
To view a detailed instruction sheet click here