• Low line rise
  • Pin bore wear
  • Early upshifts
  • Soft upshifts
  • Premature 3-4 clutch failure


Many throttle valves have been modified or replaced with a kit version during previous rebuilds. This often alters performance, rendering the core unusable.


Sonnax direct-replacement, drop-in throttle valve aids in restoring the core to original condition by following the OE design.


Throttle Valve
Part No. 77968-02

Fits both aluminum sleeved and non-sleeved units.

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

In GM 4L60 units, modifying or replacing the throttle valve is a common practice during rebuild, but these modifications and replacements often alter performance, leaving the core unusable. Sonnax replacement throttle valve 77968-02 aids in restoring the core to original condition by following the OE design.

  • Valve is made from hardened steel
  • Follows OE design
  • Salvages cores
  • 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 4L60 (700-R4) Valve Body Layout

GM 4L60 (700-R4) Valve Body Layout
  • 4L60 Throttle Valve 77968-02
  • 4L60 Throttle Valve 77968-02

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.

4L60 Throttle Valve Vacuum Test Locations