Transmission Parts GM 4L80-E4L85-E Valve Body Valve / Sleeve

Symptoms:

Bent valves
Low line rise
Delayed engagement
Gear loss
Broken AFL filters
Leaking AFL end plug
2nd Gear starts
Code 68, 85, 86, 87
No upshifts

Cause:

Extensive manual valve length, narrow OE spools and minimal valve support result in bore wear and bent valve. Leaking or damaged AFL filter or end plug causes driveability troubles.

Correction:

Renew AFL operation and restore shift control by installing Sonnax drop-in AFL filter end plug and O-ring kit.

4L80-E,4L85-E

Manual Valve Kit
Part No.34994-16K

View Instructions Find a Distributor

The OE manual valve in GM 4L80-E and 4L85-E transmissions is prone to bending due to its length and relatively narrow spools. Once bent, the valve causes excess bore wear, allowing critical fluid to escape the chosen circuits. This can result in delayed engagement, low line rise and loss of gear.

It is also common for the AFL filter and its end plug to leak, resulting in 2nd Gear starts, no upshifts and various trouble codes. Installing improved Sonnax manual valve kit 34994-16K eliminates all these problems and renews AFL and manual circuit pressure control.

Lengthened spools operate in non-worn portion of bore for added stability and wear prevention
Stem diameter increased over OE
O-Ringed end plug positively seals bore to prevent leakage
Hardcoat anodized aluminum valve combats premature wear
Annular groove added to inboard spool to reduce side-loading
Drop-in Zip Valve^™parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

Contents

Valve
AFL Filter End Plug
End Plug O-Ring
AFL Filter O-Ring

Valve Body Layout

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.看到所有Sonnax阀体outs.