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Old 08-01-2012, 07:00 PM
brian12c's Avatar
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Ford 500 transmission issues

I know this isn't a "hot rodding" question but from past experience here I know you guys are excellent mechanics.

My mother in law has a 2006 Ford 500 with the Aisin 6 speed transmission. I believe it is called the AF21. Recently it has been acting exactly the way the Ford TSB states:


Some 2005-2007 Five Hundred, Montego, and 2006-2008 Fusion, Milan, 2006 Zephyr and 2007-2008 MKZ vehicles equipped with an Aisin automatic transmission may experience shift concerns when the vehicle mileage gets above 20,000 miles (32,200 km). Shifting concerns are generally noticed during passing maneuvers with transmission at temperatures greater than 212 F (100 C) operating temperatures. Symptoms may be present during downshift 5-3 at 35 MPH (56 km/h) and/or 4-3 at 20 MPH (32 km/h) with throttle opening at approximately 50% or greater and include:
Harsh shift and/or clunk noise
Delayed shift and/or perceived slip/engine flare

The TSB says to check the fluid to see if it is burned, and if not, replace the valve body.

My 2 questions are, 1: if the fluid is burned, is the tranny toast? and 2: if I wait a while to replace the valve body, what is the risk of the tranny becoming toast in the future?


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Old 08-01-2012, 07:58 PM
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if you keep driving it a valvebody problem it can allow the clutches to burn and/or cause toque converter failure the valve body controls the operation of each clutch pack if its not getting the corect psi it will ruin a transmission
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