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4L60E 4L65E Transmission TCC Regulator & Isolator Valve Kit Sonnax 77754-03K

4L60E 4L65E Transmission TCC Regulator & Isolator Valve Kit Sonnax 77754-03K

by Sonnax
SKU S74741QK
$56.08 - $56.08
$56.08
$56.08 - $56.08
$56.08
Availability:
in stock, ready to be shipped

Delivery time

You will receive your package in 2–5 business days within the contiguous U.S.

Brand: Sonnax 

Type: Valve Body Valve Kit

Interchange Part Number: S74741QK

Manufacturer Warranty: Yes

Fitment Type: Direct Replacement

Items Included: TCC Regulator & Isolator Valve Kit

Manufacturer Part Number: 77754-03K

Material: Aluminum

Universal Fitment: Yes

Vintage Part: No

Performance Part: Yes

4L60-E Transmission Valve Body...

TCC Regulator & Isolator Valve Kit
Part No. 77754-03K

Fits '97-earlier Non-EC3 units only

Tooling:
  • F-77754-TL4
  • F-77754-SERV
  • 77754-R2
  • 77754-SERV
  • 77754-RM5
  • VB-FIX
In GM 4L60-E, 4L65-E and 4L70-E unit, severe wear of the TCC regulator valve bore is caused by oscillation of the OE valve allows regulated converter apply pressure to exhaust. This is a primary cause for TCC-related slip code P1870 and overheated converters. Exhausting apply pressure also diminishes line pressure, which can result in burnt clutches. Excess wear at the isolator valve bore reduces TCC apply pressure.

Reconditioning the bore and installing Sonnax TCC regulator and isolator valve kit 77754-03K restores normal TCC operation by shoring up the hydraulic integrity of this circuit.

  • 10% Higher apply pressure
  • Isolator valve lengthened to operate in unworn portions of the bore
  • Sleeve manufactured from highly wear-resistant aluminum
  • Hardcoat anodized aluminum valves combat premature wear
  • Annular grooves help center valves in bore to reduce future side-load wear
  • Isolator Valve
  • Spring
  • Regulator Valve
  • Regulator Sleeve


  • Patents
  • 6,990,966
  • 7,104,273

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