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  • Burnt clutches
  • Erratic line pressure
  • Low converter & lube flow
  • Overheating
  • Poor shift quality
  • TCC apply & release concerns


Continuous oscillation of pressure regulator valve results in excess bore wear, causing erratic line pressure and/or restricting converter feed oil.


Recover hydraulic control and renew line pressure performance by reconditioning the bore and installing Sonnax oversized pressure regulator valve kit.

4T60, 4T60-E, 4T65-E

Oversized Pressure Regulator Valve Kit
Part No. 84754-46K

You need this if... View Instructions

Vehicles with GM 4T60, 4T60-E and 4T65-E transmissions may exhibit multiple line pressure and converter-related problems due to excess wear in the main pressure regulator bore. Wear at the balance spool end allows critical fluid loss, resulting in high line pressure, harsh shifts, and overheating due to reduced cooler/converter flow. Wear at the outboard spool robs converter feed pressure and lowers line pressure, resulting in soft shifts and burnt clutches. Reconditioning the bore and installing Sonnax oversized pressure regulator valve kit 84754-46K restores hydraulic integrity for proper line pressure control and improved shifting in all ranges.

  • Case-hardened steel valve combats premature wear
  • Annular groove helps center valve in bore to reduce future side-load wear

OE outer spring varies from unit to unit. Appropriate replacement springs provided in kit; see instructions for details.

  • Valve
  • Outer Springs (3) Selective

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

GM 4T65-E Valve Body Layout

Gm 4t65 e thumb

March 21, 2013

GM 4T65-E Vacuum Test Guide

Topics: Vacuum Test Guides Vacuum Testing Transmission GM 4T65-E Transmission

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September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

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  • 84754 46k combo
  • 84754 46k

You need this if...

  • 84754 46k test 4t60 e
  • 84754 46k test 4t65 e