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

The non-anodized valves score and seize in the bore

Correction:

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

4T60-E, 4T65-E

4-3 Downshift Valve

Part No.

84754-39K

4-3 Downshift Valve
  • 84754-39k_combo

  • 4-3 Downshift Valve

Small_84754-39k_combo Small_84754-39k

4T60-E, 4T65-E

4-3 Downshift Valve

Part No. 84754-39K

Complaint:

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

Cause:

The non-anodized valves score and seize in the bore


Correction:

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

  • Material: Anodized Aluminum

OE 4T60-E shift valves have changed materials over the years, starting with steel, changing to silver-colored uncoated raw aluminum, and finally anodized aluminum. 4T60-E 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. It is highly recommended to replace all raw aluminum shift valves with the Sonnax hard-coat anodized replacements. These are drop-in replacements and do not require any machining. Valves also have applications in 4T60-E and 4T65-E.

  • Sonnax valves use a hard-anodized finish to reduce wear and friction
  • Valves incorporate annular grooves to center the valves and reduce sticking caused by side loading

Related Parts

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Valve Body Layouts

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.

Valve Body Layout GM 4T65-E

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