ISOLATOR SLEEVE KIT (4L60E-4L70E)
# 37787K

Isolator Sleeve Kit* *Requires Reamer

ISOLATOR SLEEVE KIT (4L60E-4L70E)

Symptoms:

  • Code 894, 1870
  • TCC cycling
  • TCC slip
  • 3-4 Clutch failure

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:
This isolator sleeve kit combined with Sonnax TCC regulator valve kit helps restore normal TCC operation.


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 isolator sleeve kit 77754-ISO in combination with Sonnax TCC regulator valve kit 77754-03K or 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.

Contents:

  • Retaining Ring
  • Sleeve

SONNAX Installation Instructions

Type of Product: Sundry Parts
Qty Needed:
Years:
Alternative #:
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