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


The non-anodized valves score and seize in the bore.


Sonnax drop-in 3-2 manual downshift valve is hardcoat anodized aluminum with annular grooves which eliminate surface wear and reduce valve hang-up.

4T60-E, 4T65-E

3-2 Manual Downshift Valve
Part No. 84754-37K

Fits ’94-later 4T60-E. Does not fit 4T65-E Geartronic® or Tapshift® units.

You need this if... View Instructions Find a Distributor

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 3-2 manual downshift valve 84754-37K eliminates surface wear and reduces valve hang up.

  • Hardcoat anodized aluminum valve combats premature wear
  • Annular grooves to center the valves and reduces sticking caused by side loading
  • Drop-in Zip Valve™ installs quickly and easily
Learn More About Zip Valve™ Drop-In Repairs

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 Valve Body Layout
  • 4T60-E, 4T65-E 3-2 Manual Downshift Valve 84754-37K
  • 4T60-E, 4T65-E 3-2 Manual Downshift Valve 84754-37K

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.

4T60-E, 4T65-E 3-2 Manual Downshift Valve Vacuum Test Locations