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Symptoms:

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

Cause:

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

Correction:

These valve and sleeve kits restore the hydraulic integrity of the circuit.

4L60

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

Prevents forced 4-3 kickdown below three-quarter throttle

View Instructions

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 77966-94MK 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 have been tightly toleranced to restore hydraulic integrity.
  • Spring
  • Sleeve
  • Plunger
  • 77966 94mk combo
  • 77966 94mk

Instructions