Check ball blow-out

April 2, 2015
2010 and up Ford Vehicles equipped with the 6F35 transaxle may suddenly exhibit a concern of a harsh application in reverse and or a harsh up-shift into third gear. 

2010 and up Ford Vehicles equipped with the 6F35 transaxle may suddenly exhibit a concern of a harsh application in reverse and or a harsh up-shift into third gear. This may also be accompanied with what feels like a slight bind up during the 2-3 shift transition.

The cause may be a check ball problem in the valve body. Sam Daniels of Powers Transmissions in Kentucky sent in pictures showing how the Drive 2 check ball in the valve body (figure 1) has damaged the check ball seat in the spacer plate (figure 2). This causes a poor seal of the check ball allowing the exhaust backfill circuit to be charged with pressure affecting the shift. There have been incidences of the check ball blowing completely through the plate. Damage to the Low/Reverse Clutch may also occur as a result of uncontrolled Drive 2 oil.

At one time, the only way this could be repaired is with the purchase of a new valve body. The part number was BL8Z-7A100-A which has been changed to CV6Z-7A110B. This valve body is $109.22 with a core deposit of $275. And this may be needed as the solenoid regulator valve in this valve body is notorious for wearing out the bore. If the bore is not worn, an updated spacer plate can be purchased separately for only $5.67, part number DV6Z-7Z490-B. 

About the Author

Motor Age Wire Reports

These are press releases approved by our Motor Age Editors

Sponsored Recommendations

Learn how electronic parking brake actuators have replaced manual systems and now play a key role in advanced safety features like automatic emergency braking. This WIYB Training...
Not all fuel injectors are created equal. In this WIYB Training Series, we compare Standard® Fuel Injectors against OE, low-cost imports. See why precision engineering and rigorous...
Carrying active OEM subscriptions for all manufacturers is not possible for many shops. However, access to this software is required for certain modern vehicles and repairs, and...
Enhance your collision repair workflow with Autel’s IA900, a process-driven solution integrating precision alignment, bi-directional diagnostics, and ADAS calibration. Designed...

Voice Your Opinion!

To join the conversation, and become an exclusive member of Vehicle Service Pros, create an account today!