• Low line rise
  • Early upshifts
  • Soft upshifts
  • Premature 3-4 clutch failure
  • Low line pressure


The steel TV plunger wears the TV plunger sleeve, allowing TV feed oil to leak past the plunger and exhaust.


This drop-in valve and sleeve kit restores the hydraulic integrity of the circuit.


Throttle Valve Plunger Valve Kit
Part No. 77966-94K

OE plungers with code 94

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Poor line rise or no detent downshifts can be common complaints in vehicles with a THM 700-R4 transmission. The steel throttle valve plunger continuously reciprocates within the aluminum throttle valve plunger sleeve, wearing the sleeve. This wear allows throttle valve feed oil to leak past the plunger and exhaust, resulting in poor line rise and problematic downshifts. In addition, the OE spring is weak and can result in low line rise, insufficient throttle pressure and, ultimately, 3-4 clutch failure. Sonnax throttle valve plunger valve kit 77966-94K includes an improved throttle valve spring designed to maintain higher line pressure and improved TV performance.

  • Sleeve is made from high-quality aluminum to prevent wear
  • Sleeve and plunger are tightly toleranced to restore hydraulic integrity
  • Drop-in Zip Valve™ parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Plunger
  • Sleeve
  • 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.

GM 4L60 (700-R4) Valve Body Layout

GM 4L60 (700-R4) Valve Body Layout
  • 4L60 Throttle Valve Plunger Valve Kit 77966-94K
  • 4L60 Throttle Valve Plunger Valve Kit 77966-94K