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TRANSMISSION RANDOMLEY DOWN SHIFTS OUT OF OVERDRIVE

Tiny
MARKYATES
  • MEMBER
  • 1994 FORD AEROSTAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I have a 1994 Ford Aerostar. When driving on the freeway at 65mph +/- in overdrive.
The transmission will randomly downshift into drive and stay in that gear.
Sometimes, (after a few minuets) it will then randomly up shift back into OD, but this is rare.
When it downshifts out of OD, nothing I do (use the column to shift into other gears and back, into neutral and back) will make it up shift back into OD when I return to that gear.
Now here is the only thing that works.
When the transmission (randomly) down shifts into drive, I can get it to up shift back into OD, by stepping down on the accelerator, but as soon as I let off slightly, it downshifts again immediately.
To me it feels like it is a vacuum signal issue but I don't know anything about this vehicle/trans characteristics
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Wednesday, February 12th, 2014 AT 7:40 AM

5 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have a trans guy look at it your o/d is probably bad
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Wednesday, February 12th, 2014 AT 8:05 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Has the check engine light or OD light come on? Is the trans fluid clean and full?
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Wednesday, February 12th, 2014 AT 8:05 AM
Tiny
MARKYATES
  • MEMBER
  • 3 POSTS
The trans was rebuilt by one shop, and the problem continued.
A year later I had it rebuilt by a more competent shop. The problem continues.
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+1
Wednesday, February 12th, 2014 AT 9:30 AM
Tiny
MARKYATES
  • MEMBER
  • 3 POSTS
No, no, yes and yes.
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Wednesday, February 12th, 2014 AT 9:32 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If it is still continuing then take it back they shold warranty it if it is still doing the same thing.
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Wednesday, February 12th, 2014 AT 9:55 AM

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