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Transmission

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Symptoms:
  • 1-2 Harsh
  • 3-4 Clutch burned
  • Code 1870
  • Low TCC apply pressure
  • Overheated converter
Cause:

Severe wear of the TCC regulator bore allows regulated converter apply pressure to exhaust, while wear at the isolator valve bore reduces TCC apply pressure.

Correction:

Sonnax TCC regulator valve kits restore hydraulic integrity to the bore and prevent side loading.

Tool Required Icon VB-FIX Required Icon

TCC Isolator & Regulator Valve Kit

Part No.

77754-04K

4L60-E, 4L65-E, 4L70-E

  • 77754-04k_combo

  • TCC Isolator & Regulator Valve Kit

Small_77754-04k_combo Small_77754-04k__1_
Tool Required Icon VB-FIX Required Icon

TCC Isolator & Regulator Valve Kit

Part No.

77754-04K

  • Isolator Valve
  • Spring
  • Regulator Valve
  • Regulator Sleeve

Any application, including 1998 & later EC3 units

Complaint:

  • 1-2 Harsh
  • 3-4 Clutch burned
  • Code 1870
  • Low TCC apply pressure
  • Overheated converter

Cause:

Severe wear of the TCC regulator bore allows regulated converter apply pressure to exhaust, while wear at the isolator valve bore reduces TCC apply pressure.


Correction:

Sonnax TCC regulator valve kits restore hydraulic integrity to the bore and prevent side loading.

Severe wear of the TCC regulator valve bore from the OE valve allows regulated converter apply pressure to exhaust. This is a primary cause for a TCC-related 1870 slip code and overheated converters. Exhausting apply pressure also diminishes line pressure, which results in burnt clutches. Excessive wear at the isolator valve bore reduces TCC apply pressure. The Sonnax TCC regulator valve kit 77754-04K allows you to restore hydraulic integrity of the apply circuit.

  • Sleeve is manufactured from highly wear-resistant aluminum to provide full support for the valve and prevent side loading
  • Valves are hardcoat anodized to reduce wear and have annular grooves for better centering within the sleeve
  • Isolator valve has been lengthened to operate in unworn portions of the bore
  • Patent No. 6,990,966
  • Patent No. 7,104,273

You need this if...

See the Part Selection and Reaming Options Instruction sheet to determine which combined Sonnax parts and tool kits will repair your GM 4L60-E PWM and Non-PWM valve body

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Sonnax

January, 2013

GM 4L60-E Vacuum Test Guide

Contact a Sonnax Distributor to purchase this part.