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Symptoms:
  • 3-4 Clutch burned
  • Reduced band life
  • Soft slide shifts
Cause:

MTV boost loss and insufficient line rise.

Correction:

These replacement assemblies prevent oil loss between the outside diameter of the TV sleeve and the pump body.

200-4R, 4L60

TV Boost Valve Kit

Part No.

77917-01K

TV Boost Valve Kit
  • TV Boost Valve Kit

Small_77917-01k

200-4R, 4L60

TV Boost Valve Kit

Part No. 77917-01K

  • Boost Valve
  • Boost Sleeve
  • O-Rings (2)

.423" Dia., O-Ring style

Complaint:

  • 3-4 Clutch burned
  • Reduced band life
  • Soft slide shifts

Cause:

MTV boost loss and insufficient line rise.


Correction:

These replacement assemblies prevent oil loss between the outside diameter of the TV sleeve and the pump body.

A common problem in 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leakage. The Sonnax replacement assemblies 77917-01K (.423" diameter), 77917-471 (.471" diameter) and 77917-500 (500" diameter) eliminate these problems for a variety of applications.

  • Throttle valve boost valve and sleeve are made from made from hardened steel for better wear resistance.
  • O-rings on sleeve separate throttle pressure and reverse boost circuits, providing additional protection against cross leaks.
  • O-rings prevent loss of oil between the outside diameter of the throttle valve sleeve and pump body.

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Contact a Sonnax Distributor to purchase this part.