Ford AX4N Transmission grief

FORD TAURUS
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ZOGGIN
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  • 9 POSTS
I have a 1998 Taurus SE 3.0L V6 DOHC. The trans would not shift out of 2nd gear at all. It would not even downshift to 1st when I came to a stop. I then ran the shifter through all the gears (incl reverse) while the vehicle was stopped. This seemed to fix the problem-for now. There were no codes when a technician scanned the PCM for any problems.

The transmission was rebuilt 30,000 miles ago. The fluid & filter were changed last week.

Could it be a bad transmission sensor?
Feb 20, 2007 at 9:15 AM
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CHEVY22
  • ✓Experienced Mechanic
  • 1,375 POSTS
ahhh , the ax4n , there are several problems with that unit , one that seems like it fits your problem was a faulty intermediate support which restricts fluid to the forward/direct drum , also drums have failed , i wonder if the bulletin and updated part was out when your unit was built , no codes just means the pcm hasnt seen the problem as a failure or non computer related failure , and i have to say whenyou have an overhaul that doenst mean every part is replaced , keep us informed of whats happening
Feb 20, 2007 at 10:17 AM
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ZOGGIN
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Could it be the MLP sensor? Or the VSS? The trans fliud is clear and pink...
Feb 20, 2007 at 10:21 AM
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CHEVY22
  • ✓Experienced Mechanic
  • 1,375 POSTS
they would show up on a scan , maybe drive it and see what happens , maybe nothing , i was giving possibles, just take it easy and listen and feel for anything abnormal until you get a light , it may just be a fluke
Feb 20, 2007 at 10:35 AM
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BPHILLIPS
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Sometimes an MLP switch will not code in the PCM and i have seen them cause all kinds of differant shift problems. The MLP switch can get heat sinked and bork out when it gets hot.
Feb 20, 2007 at 11:01 AM
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ZOGGIN
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  • 9 POSTS
Is this MLP simple to repair/replace?
Feb 20, 2007 at 1:53 PM
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