Symptoms:

  • No lockup
  • Falls out of lockup when hot
  • Fluid blown out fill tube
  • Lockup immediately after 2nd gear
  • 1-2, 2-3, 4-5 Flares

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:

These improved drop-in TCC apply valves with PTFE seals 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.

View Instructions Find a Distributor
  • 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
  • Seal PTFE
  • Valve Steel

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.

GM 200-4R Valve Body Layout

GM 200-4R Valve Body Layout
  • 200-4R, 4L60, 4L60-E TCC Apply Valve Kit 77805-K
  • 200-4R, 4L60, 4L60-E TCC Apply Valve Kit 77805-K
  • 200-4R, 4L60, 4L60-E TCC Apply Valve Kit 77805-K details