Symptoms:

  • Wrong gear starts
  • Clutch failure
  • Solenoid performance codes
  • No 4th
  • Band failure
  • Low solenoid feed pressure
  • 2-3 Neutral
  • 2nd Gear starts
  • Code 68, 85, 86, 87

Cause:

Actuator feed limit bore wear results in low pressure at shift and EPC solenoids.

Correction:

Redesigned anodized AFL valve regulates pressure while the wear-resistant sleeve re-establishes hydraulic integrity.

4L80-E, 4L85-E

Actuator Feed Limit Valve Kit
Part No. 34200-16K


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

The actuator feed limit (AFL) valve in GM 4L80-E and 4L85-E units has a large reaction area and is greatly affected by side loading, which wears the valve body bore. The EPC solenoid oscillates the torque signal and AFL oil, which increases valve action and accelerates wear. As bore wear increases, oil pressure is reduced to the shift solenoids, which causes solenoid and ratio codes. The same AFL oil loss results in lower line pressure.

Installing Sonnax actuator feed limit valve kit 34200-16K corrects AFL oil pressure loss, restoring shift solenoid pressure to prevent wrong gear starts and other shift concerns. The hard-coat anodized valve is extremely wear resistant, and annular grooves have been added to minimize the effect of side loading. The Sonnax wear-resistant sleeve provides more valve contact area, providing additional support and further reducing valve and bore wear.

  • Kit includes wear-resistant sleeve and anodized valve with annular grooves to prevent side loading
  • Valve operates in full-contact sleeve, providing 54% more support
  • Boosts oil pressure to the shift solenoids
  • Eliminates AFL oil loss, corrects low line pressure
  • Valve
  • Sleeve
  • Long Spring
  • Short Spring
  • Retaining Clip

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 4L80-E, 4L85-E, 400 Valve Body Layout

GM 4L80-E, 4L85-E, 400 Valve Body Layout

  • 4L80-E, 4L85-E Actuator Feed Limit Valve Kit 34200-16K
  • 4L80-E, 4L85-E Actuator Feed Limit Valve Kit 34200-16K

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.

4L80-E, 4L85-E Actuator Feed Limit Valve Kit Vacuum Test Locations