This high-quality, heavy-duty pressure regulator valve spring 77917-10 from Sonnax fits GM 4L60E, 4L65E and 4L70E transmissions. The spring increases line pressure by approximately 13%, improving transmission performance in both standard and high performance applications.

• Increases line pressure by approximately 13%
• Produces firmer engagements/upshifts without creating harshness or clunky downshifts
• Improves transmission performance in both standard and high performance applications