Symptoms:

Coastdown Neutral after 4th Gear
No Forward
No 4th
Burnt Forward clutch

Cause:

Forward control valve is bent or sticking from the stem, smashing into the retainer clip.

Correction:

Resize the bore and install the Sonnax drop-in forward control valve to restore valve function and prevent future problems.

4F50N, AX4N

Forward Control Valve Kit
Part No. 96206-07K

Requires:

96206-BST (Recommended)

View Instructions Find a Distributor

The front stem of the Ford 4F50N, AX4N aluminum forward control valve bangs against the steel retaining clip when stroked. The force of this constant banging often causes the valve to warp and seize in the bore, as well as breaking the OE clip. No valve movement can result in a neutralling-out complaint, no 4th gear or a burned forward clutch. The Sonnax forward control valve kit 96206-07K corrects these problems.

Sturdier front spool on valve provides more than twice the spool-to-bore contact area
Design prevents valve warpage and/or seizure
Annular grooves are added to the spools to properly center the valve and prevent leakage
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

Note

Although this valve does not require a reamer, use of the bore sizing tool 96206-BST (no longer in production) is highly recommended to quickly and easily resize the bore.

Contents

Valve
Regulating Spring
Retainer Clip
Bumper Spring

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. See all Sonnax valve body layouts.