• Low throttle pressure
  • Low line pressure


Weak OE spring


The replacement Sonnax spring is stronger, which maintains higher line pressure and TV performance. 

200, 200-4R, 200C, 4L60

TV Plunger Spring
Part No. 77968-01K

Package Quantity: 5

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The OE throttle valve spring is weak, resulting in low line pressures and insufficient throttle pressure for higher performance applications. Our stronger TV spring helps to maintain higher line pressure and improved throttle valve performance. This spring may be used with the OE valve configuration or the Sonnax replacement valves kits.

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 200-4R Valve Body Layout

GM 200-4R Valve Body Layout
  • 200, 200-4R, 200C, 4L60 TV Plunger Spring 77968-01K