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  • 2-3 Shuttle
  • Erratic shifts
  • Temperature-sensitive shifts
  • No 3rd
  • No 4th
  • 2nd Gear starts


The non-anodized valves score and seize in the bore


These valves are hard anodized with annular grooves which eliminate surface wear and reduce valve hang-up.

4T60-E, 4T65-E

4-3 Manual Downshift Valve
Part No. 84754-39K

In 4T60-E units, fits '91-later units only.

You need this if... View Instructions

GM 4T60-E and 4T65-E shift valves have changed materials over the years, starting with steel, changing to silver-colored uncoated raw aluminum, and finally anodized aluminum. These units can have a combination of these materials with the silver-colored uncoated raw aluminum being especially problematic due to scoring/scratching and intermittent sticking. Sonnax 4-3 manual downshift valve 84754-39K eliminates surface wear and reduces valve hang up.

  • Hardcoat anodized aluminum valves combat premature wear
  • Annular grooves to center the valves and reduces sticking caused by side loading

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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  • 84754 39k in combo
  • 84754 39k

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

  • 84754 39k in test